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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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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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Table Of Contents, The Editors Mar 2023

Table Of Contents, The Editors

Coal Geology & Exploration

No abstract provided.

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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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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, & Marine Sciences Faculty Publications

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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Table Of Contents, The Editors Mar 2023

Table Of Contents, The Editors

Coal Geology & Exploration

No abstract provided.

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Ecological Environment Assessment Of Shanxi Province And Planned Mining Area Based On Coupling Remote Sensing Ecological Index (Rsei) Model, Ji Xianglin, Yan Yueguan, Guo Wei, Teng Yongjia, Zhao Chuanwu Mar 2023

Ecological Environment Assessment Of Shanxi Province And Planned Mining Area Based On Coupling Remote Sensing Ecological Index (Rsei) Model, Ji Xianglin, Yan Yueguan, Guo Wei, Teng Yongjia, Zhao Chuanwu

Coal Geology & Exploration

Ecological environment quality is an important indicator to evaluate the livability, and quantitative assessment on the change rule of regional ecological environment quality could provide scientific basis for the regional ecological environment protection and governance. Taking Shanxi Province and its planned mining area as the research area, the original Remote Sensing Ecology Index (RSEI) is added with Net Primary Productivity (NPP) and Habitat Quality (HQ) to characterize the carbon sink level and habitat suitability respectively based on Google Earth Engine (GEE) platform. Herein, three representative years from 2000 to 2018 were selected for analysis. Specifically, the temporal and spatial heterogeneity …

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Influencing Mechanism Of Rock Thermal Resistance On Convective Heat Transfer Of Fracture, Wang Yaning, Lu Chuan, Wang Guiling Mar 2023

Influencing Mechanism Of Rock Thermal Resistance On Convective Heat Transfer Of Fracture, Wang Yaning, Lu Chuan, Wang Guiling

Coal Geology & Exploration

The convective heat transfer characteristics between high temperature rocks and fluids in Enhanced Geothermal Systems (EGS) have been an important fundamental element of research on Hot Dry Rock (HDR). The thermal resistance of rock has an important influence on the convective heat transfer characteristics of fracture. In order to study its specific influence, two research methods, i.e., the theoretical analysis and the numerical simulation, were used in combination to study the heat transfer law between two parallel smooth flat plates by discussing the analytical solution and establishing the numerical model. The results show that the local Nusselt number Nux …

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Research On Control System Of Drill Pipe Conveying Device Based On Fuzzy Particle Swarm Optimization, Zhang Ning, Liu Qi, Shao Junjie, Chang Jianghua, Luo Pengping, Zou Zujie Mar 2023

Research On Control System Of Drill Pipe Conveying Device Based On Fuzzy Particle Swarm Optimization, Zhang Ning, Liu Qi, Shao Junjie, Chang Jianghua, Luo Pengping, Zou Zujie

Coal Geology & Exploration

In the tripping operation of large-diameter rescue well construction, the drill pipe conveying device used for large-diameter drilling tool transportation and drill string connection. In view of the problem that it is difficult to quickly and accurately lift the drill pipe to the angle of power head for make-up due to its easy vibration in the process of positioning, the structural characteristics and working principle of the drill pipe conveying device were analyzed at first. The kinematic model for the lifting of drill pipe was deduced with the structural relationship, obtaining the mapping relationship in the motion law of the …

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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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Lithium And Lithium Isotope Behavior During High Temperature Solid/Fluid Exchanges: Examples From Iceland And The Izu-Bonin Forearc, Alex Maruszczak Mar 2023

Lithium And Lithium Isotope Behavior During High Temperature Solid/Fluid Exchanges: Examples From Iceland And The Izu-Bonin Forearc, Alex Maruszczak

USF Tampa Graduate Theses and Dissertations

The development of a method for lithium isotopic measurement was developed using a quadrupole, single-collector ICP-MS. Measured precision was ±1.00‰ 2σ over a 15-month period based on measurements of international rock standards. A 1-hour leach using cold, HCl was sufficient to remove alteration-related Li in minimally to moderately altered seafloor basalts. Measurements on the Holocene ages lavas from the neovolcanic zones of Iceland suggest no systematic Li isotopic variability among the differing Icelandic sources. Felsic samples from Hekla and Pumice contain elevated Li contents of >18ug/g while the tholeiitic and alkaline basalts are <8ug/g Li. Most of the island lies around MORB values of ~+3 to +5‰ with the exception of Western Volcanic Zone samples that show evidence for seawater inputs. The RN-17 drillcore, which penetrates >3000m through a hydrothermal system in the …

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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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Optimization Of Cemented Filling Material Ratio Based On Rsm-Bbd Method And Engineering Application, Wang Shushuai, Xu Bin, Li Yang, Yang Zhen Mar 2023

Optimization Of Cemented Filling Material Ratio Based On Rsm-Bbd Method And Engineering Application, Wang Shushuai, Xu Bin, Li Yang, Yang Zhen

Coal Geology & Exploration

In view of the problems of large stacking of solid waste caused by roof caving method in coal seam mining and imbalance between mining and filling in long-wall cemented backfilling, the No.31 ming area of Chahasu Coal Mine in Inner Monogolia uses continuous mining and filling roadway cemented backfilling mining technology, adopting the “mining at intervals of three” mining method and the “three with high strength filling and one with low strength filling” filling mode. The filling material ratio has an important influence on the filling cost and effect. In order to solve the problems of high cement consumption and …

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Mechanical Properties And Mechanism Of Co-Curing Saline Soil With Coal Solid Waste, Dong Chenxi, Wang Nianqin, Li Jiangshan, Chen Xin, Yan Xusheng, Ma Wei Mar 2023

Mechanical Properties And Mechanism Of Co-Curing Saline Soil With Coal Solid Waste, Dong Chenxi, Wang Nianqin, Li Jiangshan, Chen Xin, Yan Xusheng, Ma Wei

Coal Geology & Exploration

Under the research background of resource utilization of solid wastes in the arid and semiarid regions, a new curing material was developed with the coal wastes (such as the coal gangue (CG) and coal metakaolin (CMK)), the carbide slag (CS) that is a waste material readily available in the arid region, and the ordinary Portland cement (OPC). Besides, its mechanical properties and microscopic change mechanism in curing of saline soil in the arid and semi-arid regions were discussed. Based on the laboratory experiment, the unconfined compressive strength (UCS) characteristics of curing saline soil in different ages were studied by replacing …

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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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Forward Modeling Of Radio-Magnetotelluric Method Based On Julia Acceleration And Study On Effect Of Displacement Current, Mei Zhuxu, Yuan Yuan, Zhou Feng, Zhou Cong, Zhang Lincheng Mar 2023

Forward Modeling Of Radio-Magnetotelluric Method Based On Julia Acceleration And Study On Effect Of Displacement Current, Mei Zhuxu, Yuan Yuan, Zhou Feng, Zhou Cong, Zhang Lincheng

Coal Geology & Exploration

Radio-magnetotelluric method (RMT) is one of the important tools for shallow surface electromagnetic exploration. Since the exploration frequency band is 10‒300 kHz, the propagation of electromagnetic fields is greatly affected by the dielectric permittivity of the earth. The electromagnetic response calculated with traditional quasi-static conditions severely restricts the accuracy of RMT forward modeling and further affects the resolution of the inversion imaging. In response to this problem, a numerical simulation method of full-current RMT electromagnetic response based on Julia parallel acceleration was proposed. Then, the calculation of each frequency point was sent through the distributed computing in Julia to different …

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One Surface Borehole With Multi-Usage Gas Drainage Key Technology For Abandoned Well And Its Application, Fu Junhui Mar 2023

One Surface Borehole With Multi-Usage Gas Drainage Key Technology For Abandoned Well And Its Application, Fu Junhui

Coal Geology & Exploration

Gas drainage from mining area could be realized through the reconstruction and reuse of abandoned surface gas wells in the coal mine area , which has multiple economic and environmental benefits such as ensuring the safe production of mining, the effective utilization of gas resources, and reducing the pressure of gas escape on the environment. In view of this purpose, the idea of “one surface borehole with multi-usage” gas drainage technology for abandoned wells was proposed based on the characteristics of the surface borehole and the abandoned wells in the mining area. By analyzing the conditions of the mining technology, …

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New Understanding Of Coal Seam Distribution Law: Coal Accumulation Model Controlled By Paleoclimate Evolution, Hou Haihai, Chen Hongzhen, Shao Longyi, Pan Zizi Mar 2023

New Understanding Of Coal Seam Distribution Law: Coal Accumulation Model Controlled By Paleoclimate Evolution, Hou Haihai, Chen Hongzhen, Shao Longyi, Pan Zizi

Coal Geology & Exploration

It is very important for coal and coal-measure gas exploration to correctly understand the distribution law of coal seam and its main control factors in different coal accumulation models. Based on the review of the theories and models of paleogeographic coal control, coal accumulation in sequence stratigraphy, allochthonous coal accumulation and multiple coal accumulation theoretical system, a new coal accumulation model under the control of climatic revolution was proposed through the analyses of the Jurassic coal-bearing strata in the southern margin of Junggar Basin. The paleotemperature and paleohumidity during Badaowan Formation(coal accumulation period), Sangonghe Formation, Xishanyao Formation (coal accumulation period) …

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A New Model Of Surface And Underground Integrated Three-Dimensional Prevention And Control Of Rock Burst In Binchang Mining Area, Wu Xueming, Ma Xiaohui, Lyu Dazhao, Zheng Kaige, Wang Dongjie Mar 2023

A New Model Of Surface And Underground Integrated Three-Dimensional Prevention And Control Of Rock Burst In Binchang Mining Area, Wu Xueming, Ma Xiaohui, Lyu Dazhao, Zheng Kaige, Wang Dongjie

Coal Geology & Exploration

With the continuous increase of coal mining intensity, the mine gradually moves to the deep, bringing about increasingly serious rock burst hazard. The deep rock burst mines often have one or more layers of hard and thick rock strata. These hard roofs are thick and strong integrity. When they suddenly rupture, they can release a large amount of elastic energies, which can easily to cause rock burst accidents and seriously restrict the safety of mine production. Herein, appropriate treatment measures were put forward for the special situation of deep burial depth of coal seam and general presence of many kinds …

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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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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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Deformation Prediction Of Open-Pit Mine Slope Based On Abc-Grnn Combined Model, Ning Yongxiang, Cui Ximin, Cui Jianguo Mar 2023

Deformation Prediction Of Open-Pit Mine Slope Based On Abc-Grnn Combined Model, Ning Yongxiang, Cui Ximin, Cui Jianguo

Coal Geology & Exploration

Accurate prediction of slope deformation in open-pit mine is an important guarantee for effective disaster early warning of slope. The traditional slope deformation prediction method is unable to characterize and comprehensively analyze the effect of various factors on slope deformation. In view of this, the combined prediction model (ABC-GRNN) of an artificial bee colony algorithm (ABC) and the optimized generalized regression neural network (GRNN) was proposed for slope deformation in open-pit mine. In this prediction model, the following 5 factors affecting the slope deformation of open-pit mine are considered comprehensively: mining disturbance, rainfall, rainfall duration, temperature and humidity. Herein, the …

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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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Feasibility Study Of Nature Source In-Seam Exploration, Hu Ze’An, Cao Lingkai, Liu Qinjie, Ji Guangzhong, Xi Chaoqiang, Wu Rongxin Mar 2023

Feasibility Study Of Nature Source In-Seam Exploration, Hu Ze’An, Cao Lingkai, Liu Qinjie, Ji Guangzhong, Xi Chaoqiang, Wu Rongxin

Coal Geology & Exploration

The conventional explosive seismic sources are very tightly controlled in high-gas mine, and a novel non-explosive channel wave method is urgently needed as an alternative. Therefore through the theoretical analysis and numerical simulation experiments, we demostrated that the coal seam satisfied the geophysical conditions to develop the nature source in-seam wave. The time-domain numerical simulation experiment of the passive source channel wave was successfully realized by constructing the nature source in-seam wave model with three stochastic terms, including the stochastic spatial position, stochastic initial excitation time and stochastic amplitude of seismic source. We performed frequency dispersion spectrum calculation on the …

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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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Development Of Storage Equipment Of Continuous Cable Pipe For Borehole Rescue, Gao Ke, Niu Xin, Zhao Yan, Qin Xiaolin, Lyu Xiaoshu, Xie Xiaobo Mar 2023

Development Of Storage Equipment Of Continuous Cable Pipe For Borehole Rescue, Gao Ke, Niu Xin, Zhao Yan, Qin Xiaolin, Lyu Xiaoshu, Xie Xiaobo

Coal Geology & Exploration

The double-bit bionic self-balancing continuous drilling technology has the advantages including requiring no drilling rig, high drilling speed and slight disturbance to the borehole wall. It is one of the key potential technologies for constructing the security and rescue passages against mine disasters. In this technology, as there are passages for power supply, signal, chip removal and other aspects that are built in the continuous cable pipe, it is required that there shall be no such interference, extrusion or arrangement of dynamic/static conductive electric conduction link as in using the existing drum hoist to store continuous pipes during storage. Therefore, …

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