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Articles 2701 - 2730 of 52393

Full-Text Articles in Physical Sciences and Mathematics

Theoretical Framework And Key Technology Of Advance Regional Control Of Water Inrush In Coal Seam Floor, Dong Shuning, Liu Qisheng, Wang Hao, Guo Xiaoming, Liu Zhaoxing, Zheng Shitian, Nan Shenghui, Liu Jianlin, Zhao Zhao, Shi Zhiyuan Mar 2023

Theoretical Framework And Key Technology Of Advance Regional Control Of Water Inrush In Coal Seam Floor, Dong Shuning, Liu Qisheng, Wang Hao, Guo Xiaoming, Liu Zhaoxing, Zheng Shitian, Nan Shenghui, Liu Jianlin, Zhao Zhao, Shi Zhiyuan

Coal Geology & Exploration

The shallow coal resources in North China have been nearly depleted so far, whereas deep coal development is challenged by karst water inrush in floor limestone. The conventional underground vertical hole grouting methods are troubled with inappropriate site location, thin drilling-met aquifer, large grouting blind area, and inaccurate target location. For this reason, we propose an advance regional control technology: bedding directional drilling-based grouting. We systematically study the slurry flow from near-horizontal grouting holes, advance grouting modes, grouting parameter control, advance identification of potential water diversion channels, as well as validation and assessment of a grouting treatment. On this basis, …

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Technological System Of Water-Conserving Coal Mining, Fan Limin, Sun Qiang, Ma Liqiang, Li Tao, Chen Haifu, Jiang Zequan Mar 2023

Technological System Of Water-Conserving Coal Mining, Fan Limin, Sun Qiang, Ma Liqiang, Li Tao, Chen Haifu, Jiang Zequan

Coal Geology & Exploration

The research on water-conserving coal mining is the theoretical basis of water resource protection and high-quality development of coal in the ecologically vulnerable mining areas in northwest of our country. In view of the impact and damage on aquifer and ecosystem in ecologically vulnerable mining areas due to intensive mining activities in northwest China, the development process and scientific connotation of water-conserving coal mining was expounded herein. Specifically, the research on water-conserving coal mining has gone through four stages: initiation, formation, development and maturation, and a relatively perfect technological system has been formed at present, which is mainly reflected in …

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Experimental Study On Co2-Enhanced Coalbed Methane Production And Its Simultaneous Storage, Su Xianbo, Huang Jin, Wang Qian, Yu Shiyao Mar 2023

Experimental Study On Co2-Enhanced Coalbed Methane Production And Its Simultaneous Storage, Su Xianbo, Huang Jin, Wang Qian, Yu Shiyao

Coal Geology & Exploration

Experimental study on CO2-enhanced coalbed methane production and its simultaneous storage Abstract: For a long time, a lot of work has been done on CO2-enhanced coalbed methane (CO2-ECBM), but the limited industrial trials failed to achieve the expected purpose, which prevented the promotion and application of CBM enhancement technology. In recent years, with the establishment of carbon neutrality routes in different countries, CO2 geological storage has gradually gained attention, and the questions of whether coal reservoirs can be treated as CO2 storage space and whether simultaneous CO2 displacing CH4 and …

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Coal Methane Control And Its Emission Reduction Potential In China, Sang Shuxun, Liu Shiqi, Han Sijie, Zheng Sijian, Liu Tong, Zhou Xiaozhi, Wang Ran, Wang Meng Mar 2023

Coal Methane Control And Its Emission Reduction Potential In China, Sang Shuxun, Liu Shiqi, Han Sijie, Zheng Sijian, Liu Tong, Zhou Xiaozhi, Wang Ran, Wang Meng

Coal Geology & Exploration

Methane is the most important non-CO2 greenhouse gas, which has attracted more and more attention. Coal methane is the most important methane emission source in China, and China is also the country with the largest amount of coal methane emissions in the world. Therefore, the effective emission control and the efficient development and utilization of coal methane have triple benefits, such as greenhouse gas emission reduction, energy gas development and utilization, and hazardous gas control. Based on the accumulation of systematic investigation and research, the background of coal methane emission control was summarized and conclusion was made for the …

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Practice And Cognition Of Efficient Cbm Development Under Complex Geological Conditions: A Case Study Of Zhengzhuang Block, Qinshui Basin, Zhu Qingzhong, Li Zhijun, Li Zongyuan, Wang Sanshuai, Sun Ruixue, Wang Yuting, Xiao Yuhang, Wang Jingyue, Guan Xiaoqu Mar 2023

Practice And Cognition Of Efficient Cbm Development Under Complex Geological Conditions: A Case Study Of Zhengzhuang Block, Qinshui Basin, Zhu Qingzhong, Li Zhijun, Li Zongyuan, Wang Sanshuai, Sun Ruixue, Wang Yuting, Xiao Yuhang, Wang Jingyue, Guan Xiaoqu

Coal Geology & Exploration

The geological conditions of various CBM sites in China are complicated and features similarly. With the recent development of exploring CBM towards the medium-deep, ultra-low permeability and structurally complex areas, it is of great significance to develop a set of efficient exploring techniques in complex areas to revitalize a large number of domestic CBM resources. Taking an example of the successful development of Zhengzhuang Block with early low yield and relatively complex geology, it had faced a series of problems, including complex geological conditions with internal fracture, strong heterogeneity, low permeability, lack of corresponding developing technologies for the early stage …

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Discussion On Underground System Sealing Methods In In-Situ Pyrolysis Exploitation Of Tar-Rich Coal, Guo Wei, Liu Zhao, Sun Youhong, Li Qiang, Deng Sunhua Mar 2023

Discussion On Underground System Sealing Methods In In-Situ Pyrolysis Exploitation Of Tar-Rich Coal, Guo Wei, Liu Zhao, Sun Youhong, Li Qiang, Deng Sunhua

Coal Geology & Exploration

China has abundant tar-rich coal resource, in-situ underground pyrolysis is the main trend of green and efficient development of tar-rich coal resources. However, the underground in-situ pyrolysis of tar-rich coal is still in the stage of technology research and development, and it is necessary to focus on the key technology of tar-rich coal to carry out research . Underground system sealing is one of the key technologies to ensure the efficient use of energy and ecological protection of tar-rich coal in-situ pyrolysis mining, and there is an urgent need to develop and construct underground system closure technology suitable for the …

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Tectonic Control On Enrichment And Metallogenesis Of Strategic Metal Elements In Coal Measures, Cao Daiyong, Wei Yingchun, Qin Guohong, Ning Shuzheng, Wang Anmin, Zhang Yun, Li Xin, Wei Jinhao, Xu Laixin Mar 2023

Tectonic Control On Enrichment And Metallogenesis Of Strategic Metal Elements In Coal Measures, Cao Daiyong, Wei Yingchun, Qin Guohong, Ning Shuzheng, Wang Anmin, Zhang Yun, Li Xin, Wei Jinhao, Xu Laixin

Coal Geology & Exploration

The accumulation and distribution of strategic metal minerals in coal measures is the comprehensive result of multi-factors, multi-stages and multi-levels, amongst which the tectonic control is an important factor. The tectonic controlling factors of strategic metal enrichment and mineralization in coal measures include tectonic background, tectonic movement, tectono-magmatic activity, etc., which are reflected in the control of the metal mineral carrier (i.e., coal-bearing rock series), the source of metallogenic materials and the initial aggregation of elements and the later migration and recombination. The entire process of formation and evolution of coal-bearing basins is pervasively influenced by the control of tectonic …

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The Mode Of “Five Modernization And Cooperation” In Coal Development Project, Fan Jingdao, Huang Kejun, Li Chuan, Liu Wei, Song Yue, Yan Zhenguo Mar 2023

The Mode Of “Five Modernization And Cooperation” In Coal Development Project, Fan Jingdao, Huang Kejun, Li Chuan, Liu Wei, Song Yue, Yan Zhenguo

Coal Geology & Exploration

Mining engineering plays a crucial role in providing energy and raw materials to human societies. With the integration of new information technology and traditional mining technology, traditional mining engineering management is struggling to keep up with the demands of efficient coal resource development and utilization. In response, this paper proposes a "Five Modernizations and Cooperation" project management method that combines traditional and modern technologies. The Five Modernizations include greenization, intellectualization, integration, professionalization, and refinement. This method emphasizes multi-objective, collaborative, open, servo, and self-organizing characteristics, with the ultimate goal of optimizing value. The full life cycle engineering framework system is built …

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Research And Practice On Key Technologies For Intelligentization Of Coal Mine, Wang Haijun, Cao Yun, Wang Honglei Mar 2023

Research And Practice On Key Technologies For Intelligentization Of Coal Mine, Wang Haijun, Cao Yun, Wang Honglei

Coal Geology & Exploration

Intelligentization of coal mine is an important way for coal industry to achieve sustainable development. It provides effective guarantee for coal mine enterprises to reduce workers, increase efficiency and improve the production safety. The new generation of information technologies, such as big data, robotics and artificial intelligence, strongly support the intelligent construction of coal mines. Firstly, the design ideas of intelligent mines are introduced in this paper, and the overall technical system of intelligent construction are developed. Secondly, the development status and trend of key technologies for the intelligentization of coal mine are analyzed, including the general heterogeneous control and …

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Research Progress And Thinking On Integrated Tunneling And Detection Technology Of Rock Roadway With Tbm, Yuan Liang, Zhang Pingsong Mar 2023

Research Progress And Thinking On Integrated Tunneling And Detection Technology Of Rock Roadway With Tbm, Yuan Liang, Zhang Pingsong

Coal Geology & Exploration

The construction of Full Face Tunnel Boring Machine (TBM) in coal mines is crucial for achieving efficient and modern high-intensity development and mining operations. However, TBM has poor adaptability to adverse geological conditions, such as fracture zones, faults, soft rock layers, and water-rich areas, which can cause problems such as collapses, equipment sticking, and water gushing, hindering their development. To fully utilize the rapid tunneling efficiency of TBM, integrated design between advanced detection instruments and TBM must be performed. The key technology is the breakthrough in detection-while-tunneling. This paper reviews recent advancements in the integrated tunneling and detection technology of …

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Construction Of Geological Guarantee System For Green Coal Mining, Wang Shuangming, Geng Jishi, Li Pengfei, Sun Qiang, Fan Zhangqun, Li Dan Mar 2023

Construction Of Geological Guarantee System For Green Coal Mining, Wang Shuangming, Geng Jishi, Li Pengfei, Sun Qiang, Fan Zhangqun, Li Dan

Coal Geology & Exploration

Large-scale and high-intensity mining of coal resources has induced damage to geological conditions and ecological environment in coal mining areas. It is of great significance to study the coupling mechanism of geological structure-groundwater environment-ecological environment dynamic evolution caused by coal mining. Development of the theory and technology of geological guarantee for green coal development is also critical for ensuring the high-quality development of coal industry in China. In additional to the current coal mining technology, research status of geological guarantee for green development of coal is analyzed in this paper Scientific connotation of “system of geological guarantee for green development …

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Status And Advance Of Seismic Diffraction Exploration In Coalfield, Peng Suping, Zhao Jingtao, Sheng Tongjie, Yang Jie, Tao Junhong Mar 2023

Status And Advance Of Seismic Diffraction Exploration In Coalfield, Peng Suping, Zhao Jingtao, Sheng Tongjie, Yang Jie, Tao Junhong

Coal Geology & Exploration

In China, there is an urgent need for intelligent and environmentally friendly coal mining practices to address the issue of accurately mapping transparent geological conditions, including coal rock structures, water-bearing bodies, goafs, and underground stress. These hidden disaster-causing bodies are prone to triggering mine accidents such as water inrush or gas outburst, which is the main obstacle to safe and intelligent coal mining. Three-dimensional seismic exploration is the main technology for detecting geological bodies such as faults and collapse columns. However, this technology, based on the framework of reflection theory, faces challenges in detecting small-drop faults and small-scale collapse columns. …

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Analysis And Jet Drilling Test Of Coiled Tubing Drilling String For Underground Coal Mine, Yao Ningping, Wang Li, Zhang Jinbao, Dou Xuqian, Wei Hongchao Mar 2023

Analysis And Jet Drilling Test Of Coiled Tubing Drilling String For Underground Coal Mine, Yao Ningping, Wang Li, Zhang Jinbao, Dou Xuqian, Wei Hongchao

Coal Geology & Exploration

Due to continuous tripping, uninterrupted circulation and other technical advantages, coiled tubing drilling has become one of the fastest developing oil-drilling-technologies in recent years. Developing the coiled tubing drilling technology for underground coal mine is an essential technical means to realize “less humanized” or even “unhumanized” coal drilling. Aiming at solving the key problems existing in the application of this technology in underground coal mine, such as pipe string optimization and drilling method, the coiled tubing jet directional drilling method was proposed. According to the mud pump capacity and borehole depth design for underground coal mine drilling, the fluid friction …

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Research On Low Illumination Video Enhancement Technology In Coal Mine Heading Face, Zhang Xuhui, Yang Hongqiang, Bai Linna, Shi Shuo, Du Yuyang, Zhang Chao, Wan Jicheng, Yang Wenjuan, Mao Qinghua, Dong Zheng Mar 2023

Research On Low Illumination Video Enhancement Technology In Coal Mine Heading Face, Zhang Xuhui, Yang Hongqiang, Bai Linna, Shi Shuo, Du Yuyang, Zhang Chao, Wan Jicheng, Yang Wenjuan, Mao Qinghua, Dong Zheng

Coal Geology & Exploration

Aiming at overcoming low illumination, uneven brightness, blurry texture and more noise in the video of coal mine heading face, a low illumination video enhancement algorithm was proposed for coal mine heading face. Firstly,the separability of convolution was utilized to carry out one-dimensional horizontal and vertical convolution of video images, then the perfect reflection method was used to achieve the automatic white balance, and the image hybrid enhancement technology was utilized to improve the overall brightness of the video images. Then, the image was divided into the highlight area, the middle tone area and the dark tone area by recursive …

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Review And Prospect Of Coal Mine Geological Guarantee System Inchina During 30 Years Of Construction, Jia Jiancheng, Jia Qian, Sang Xiangyang, Wu Yan Mar 2023

Review And Prospect Of Coal Mine Geological Guarantee System Inchina During 30 Years Of Construction, Jia Jiancheng, Jia Qian, Sang Xiangyang, Wu Yan

Coal Geology & Exploration

Geological guarantee is the indispensable basis for the safe, efficient and green mining of coal mine. The primary objective of this paper is to present a detailed review of the construction progress of China’s geological guarantee system over the past three decades, covering the key aspects of its intention, basic theoretical research, and technological and equipment development. The statement outlines five complex technical problems faced by the geological guarantee system in the context of green and intelligent mining, which include the low level of intelligence in geological information collection and interpretation, the need to improve advance prediction reliability based on …

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Theoretical And Technological Difficulties And Countermeasures Of Deep Cbm Exploration And Development In The Eastern Edge Of Ordos Basin, Xu Fengyin, Yan Xia, Li Shuguang, Xiong Xianyue, Wang Yuxin, Zhang Lei, Liu Chuanqing, Han Jinliang, Feng Yanqing, Zhen Huaibin, Yang Yun, Wang Chengwang, Li Yuxin Mar 2023

Theoretical And Technological Difficulties And Countermeasures Of Deep Cbm Exploration And Development In The Eastern Edge Of Ordos Basin, Xu Fengyin, Yan Xia, Li Shuguang, Xiong Xianyue, Wang Yuxin, Zhang Lei, Liu Chuanqing, Han Jinliang, Feng Yanqing, Zhen Huaibin, Yang Yun, Wang Chengwang, Li Yuxin

Coal Geology & Exploration

Deep coalbed methane (CBM) resources (hereinafter referred to the CBM resources with the buried depth greater than 2 000 m) are abundant in China and have great potential in exploration and development. Since 2019, Daning‒Jixian block in the eastern edge of Ordos Basin has entered the stage of "scaled exploration + pilot test" of deep CBM, with the daily gas production exceeding 2 × 104 m 3in vertical wells and 10 × 104 m 3in horizontal wells. This remarkable achievement has broken through the traditional depth limitation in CBM exploration and development. Thus,the total resource of …

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Present Situation And Technical Research Progress Of Coalbed Methane Surface Development In Coal Mining Areas Of China, Zhang Qun, Jiang Wenping, Jiang Zaibing, Sun Siqing, Li Bingang, Du Xinfeng, Wu Xiuping, Zhao Jizhan, Fan Yao, Fan Zhangqun, Han Baoshan, Xu Yaobo, Liu Baigen Mar 2023

Present Situation And Technical Research Progress Of Coalbed Methane Surface Development In Coal Mining Areas Of China, Zhang Qun, Jiang Wenping, Jiang Zaibing, Sun Siqing, Li Bingang, Du Xinfeng, Wu Xiuping, Zhao Jizhan, Fan Yao, Fan Zhangqun, Han Baoshan, Xu Yaobo, Liu Baigen

Coal Geology & Exploration

The exploration and development process of coalbed methane (CBM) in coal mining areas, which was implemented under the organization and cooperation of the coal enterprises in China, was reviewed in this paper. After more than 30 years of hard work and unremitting efforts, gratifying achievements have been made in the research, engineering experiments and industrial development on CBM surface development technology, including the successful CBM development of anthracite coal in Jincheng mining area, Shanxi Province, for the first time at home and abroad, the largescale commercial production of CBM, the major breakthrough made in the CBM development technology by horizontal …

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Table Of Contents, The Editors Mar 2023

Table Of Contents, The Editors

Coal Geology & Exploration

No abstract provided.

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Comparison Of Soil Organic Carbon Stocks In Two Forest Types In Huron Mountains, Michigan, Nicholas Johnson Mar 2023

Comparison Of Soil Organic Carbon Stocks In Two Forest Types In Huron Mountains, Michigan, Nicholas Johnson

Research Days

It is of utmost importance to keep track of the soil organic carbon (SOC) level in forests due to how it affects atmospheric CO2 concentrations and how it mitigates climate change. This study investigates the amount of soil organic carbon that we have gathered from two different forest types such as the Red Pine and Hemlock Sugar Maple Forest. The soil samples used from these two forest types were taken from the Huron Mountain located in Michigan. The Red Pine forest is a plantation forest while the Hemlock Sugar Maple forest is natural. We will be comparing the levels of …

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Draft Final Quarterly Operations And Maintenance Report Butte Treatment Lagoon System – Fourth Quarter 2022, Pioneer Technical Services, Inc. Mar 2023

Draft Final Quarterly Operations And Maintenance Report Butte Treatment Lagoon System – Fourth Quarter 2022, Pioneer Technical Services, Inc.

Silver Bow Creek/Butte Area Superfund Site

No abstract provided.

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Air Pollution In South Texas: A Short Communication Of Health Risks And Implications, Sai Deepak Pinakana, Esmeralda Mendez, Ismaila Ibrahim, Md. Salahuddin Majumder, Amit U. Raysoni Mar 2023

Air Pollution In South Texas: A Short Communication Of Health Risks And Implications, Sai Deepak Pinakana, Esmeralda Mendez, Ismaila Ibrahim, Md. Salahuddin Majumder, Amit U. Raysoni

School of Earth, Environmental, and Marine Sciences Faculty Publications and Presentations

Air pollution is a major public health concern. The region of South Texas in the United States has experienced high levels of air pollution in recent years due to an increase in population, cross-border trade between the U.S.A. and Mexico, and high vehicular activity. This review assesses the relationships between human health and air pollution in South Texas. A thorough scientific search was performed using PubMed, Science Direct, and ProQuest, with most of the literature focusing on the source apportionment of particulate matter that is 2.5 microns or less in width (PM2.5), Carbon Dioxide (CO2), carbon monoxide (CO), Black Carbon …

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Urban Mass Transit: New York State And The Mta Sustainability Initiatives On Greenhouse Gas Emission Reduction, Omosehin Moyebi Mar 2023

Urban Mass Transit: New York State And The Mta Sustainability Initiatives On Greenhouse Gas Emission Reduction, Omosehin Moyebi

Sustainability Research & Practice Seminar Presentations

Dr. Omosehin Moyebi, Health - Urban Mass Transit: New York State and the MTA Sustainability Initiatives on Greenhouse Gas Emission Reduction

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Diverse Portfolios: Investing In Tributaries For Restoration Of Large River Fishes In The Anthropocene, Kristen L. Bouska, Brian D. Healy, Michael J. Moore, Corey G. Dunn, Jonathan J. Spurgeon, Craig P. Paukert Mar 2023

Diverse Portfolios: Investing In Tributaries For Restoration Of Large River Fishes In The Anthropocene, Kristen L. Bouska, Brian D. Healy, Michael J. Moore, Corey G. Dunn, Jonathan J. Spurgeon, Craig P. Paukert

Nebraska Cooperative Fish and Wildlife Research Unit: Staff Publications

Rehabilitation of large Anthropocene rivers requires engagement of diverse stakeholders across a broad range of sociopolitical boundaries. Competing objectives often constrain options for ecological restoration of large rivers whereas fewer competing objectives may exist in a subset of tributaries. Further, tributaries contribute toward building a “portfolio” of river ecosystem assets through physical and biological processes that may present opportunities to enhance the resilience of large river fishes. Our goal is to review roles of tributaries in enhancing mainstem large river fish populations. We present case histories from two greatly altered and distinct large-river tributary systems that highlight how tributaries contribute …

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Numerical Simulation Of Co2 Storage In Bedded Salt Rock Storage Cavern In Subei Basin, Zong Shi, Liu Shiqi, Xu Hui, Wang Wenkai, Cao Bo, Huang Fansheng Mar 2023

Numerical Simulation Of Co2 Storage In Bedded Salt Rock Storage Cavern In Subei Basin, Zong Shi, Liu Shiqi, Xu Hui, Wang Wenkai, Cao Bo, Huang Fansheng

Coal Geology & Exploration

Underground salt cavern is an effective geological body for CO2 storage. The leakage of CO2 along the weak interlayer of salt rock and the interface of salt layer and interlayer is the key to restrict the safe storage of CO2 in underground salt cavern. A fluid-solid coupling mathematical model of CO2 storage in bedded salt cavern gas storage was established based on the CO2 salt cavern storage in Jintan area of Subei basin. On this basis, the leakage and migration law of CO2 in salt rock and mudstone interlayer, as well as its influence …

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Wavefield Separation Of P- And S-Waves Based On Modified Pseudo-Helmholtz Decomposition Operator In Transverse Isotropic Media, Liu Zhaoshun, Du Qizhen, Lyu Wenhao, Zhou Shihao, Fu Liyun Mar 2023

Wavefield Separation Of P- And S-Waves Based On Modified Pseudo-Helmholtz Decomposition Operator In Transverse Isotropic Media, Liu Zhaoshun, Du Qizhen, Lyu Wenhao, Zhou Shihao, Fu Liyun

Coal Geology & Exploration

The separation of P- and S-wave fields is a significant step in elastic reverse-time migration (ERTM), which can effectively eliminate the waveform crosstalk and image artifacts, thus improving the precision of imaging. In anisotropic media, nonstationary spatial filters or low-rank approximation methods are commonly used to separate the wavefields. However, the application of multiple Fourier transforms results in the high computation costs of the above wavefield separation methods. Based on the idea of constructing the isotropic decoupling equations of P- and S- waves with the Helmholtz operator, a modified pseudo-Helmholtz decomposition operator was proposed to eliminate the amplitude distortion. Then, …

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Co2-Ecbm Simulation Study Considering Klinkenberg Factor State, Sa Zhanyou, Wu Jingbo, Yang Yongliang, Zhang Xin, Lu Shouqing, Liu Jie, Wang Hao Mar 2023

Co2-Ecbm Simulation Study Considering Klinkenberg Factor State, Sa Zhanyou, Wu Jingbo, Yang Yongliang, Zhang Xin, Lu Shouqing, Liu Jie, Wang Hao

Coal Geology & Exploration

In order to explore the role of Klinkenberg effect and Klinkenberg factor in different states in the process of CO2-Enhanced Coal Bed Methane (CO2-ECBM), the effects of Klinkenberg factor of zero, fixed Klinkenberg factor and dynamic Klinkenberg factor on CO2-ECBM were simulated and analyzed by COMSOL finite element software. The dynamic changes of CH4 and CO2 pressure with this factor were studied, and the CH4 gas production was compared with the engineering practice. The results show that the effective permeability of CH4 and CO2 increases slowly at first, then …

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Mechanism Of Coal Fine-Bubble Coupling In The Unsaturated Flow Stage Of Coalbed Methane Drainage, Han Wenlong, Li Yong, Chen Xiangsheng, Zhuo Qiming, Wang Yanbin Mar 2023

Mechanism Of Coal Fine-Bubble Coupling In The Unsaturated Flow Stage Of Coalbed Methane Drainage, Han Wenlong, Li Yong, Chen Xiangsheng, Zhuo Qiming, Wang Yanbin

Coal Geology & Exploration

To reveal the mechanism of interaction between coal fines and gas in the unsaturated flow stage of coalbed methane (CBM) drainage, it is essential to formulate the drainage system and improve the gas production. The effect of air bubbles with different diameters on coal fines with different particle sizes and densities was systematically experimented through the experiment device for microscopic interaction between the air bubble and the coal fines. Meanwhile, the influence of air bubbles on the migration trajectory and velocity of coal fines and the characteristics of coal fine capturing by air bubbles were also analyzed. The results show …

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Study On The Time Law Of Water-Rock Interaction In Coal Mine Groundwater Reservoir, Zhang Kai, Liu Shuyu, Cao Zhiguo, Gao Ju, Chen Xiangyu, Yan Jiayu Mar 2023

Study On The Time Law Of Water-Rock Interaction In Coal Mine Groundwater Reservoir, Zhang Kai, Liu Shuyu, Cao Zhiguo, Gao Ju, Chen Xiangyu, Yan Jiayu

Coal Geology & Exploration

The retention time of mine water in the coal mine underground reservoir will affect the ion concentration of effluent, but the time law of water-rock interaction during operation of the reservoir is still unclear. In order to reveal the occurrence type and intensity of water-rock interaction in different operation stages of coal mine underground reservoir, two groups of static simulation tests of water-rock interaction were designed based on the test and analysis on-site samples, namely the fine sandstone-mine water (S-K) and mudstone-mine water (N-K). The types of water-rock interaction were analyzed from two aspects: the change of rock composition and …

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Influence Of Coal Mining Disturbance On Soil Physiochemical Properties And The Response Mechanism Of Microbial Community, Song Ziheng, Liu Gang, Sun Liping, Wang Fei, Guo Junting Mar 2023

Influence Of Coal Mining Disturbance On Soil Physiochemical Properties And The Response Mechanism Of Microbial Community, Song Ziheng, Liu Gang, Sun Liping, Wang Fei, Guo Junting

Coal Geology & Exploration

The ecological problems caused by coal mining in Yellow River Basin are becoming more serious. In order to explore the influence characteristics of coal mining disturbance on soil factors and microbial community in Yellow River Basin, and to clarify the differences in soil microbial communities between the marginal coal mining subsidence area and the unmined area, equidistant sampling was performed from the marginal subsidence area, the start point (HD), to the unmined area in the study area of Shangwan Mine in Inner Mongolia. Specifically, sampling points at 150 (D1), 300 (D2), 450 (D3), 600 (D4) and 750 m (D5) from …

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Inversion Of Self-Potential Data Based On Improved Sparrow Search Algorithm, Lang Jianxiang, Tang Hongzhi, Ai Hanbing Mar 2023

Inversion Of Self-Potential Data Based On Improved Sparrow Search Algorithm, Lang Jianxiang, Tang Hongzhi, Ai Hanbing

Coal Geology & Exploration

Self-potential (SP) method is a natural source geophysical prospecting technology with low cost and simple operation for field observation. Generally, the inversion of SP data has the characteristics of ill-posedness and non-linearity. The conventional inversion algorithms are classified into the types of local optimization and global search. However, it is hard for the gradient-based local optimization algorithm to obtain the global optimal solution, and the inversion results are dependent on the construction of initial model. The traditional global search algorithm has the disadvantages of low convergence rate, insufficient ability of escaping local minima and instability. Thus, a new global optimization …

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