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coal and gas outburst mechanism of the “Three Soft” coal seam in western Henan

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Mining Science and Technology 2010年第5期20卷 712-717页

作者： LEI DongJi LI Chengwu ZHANG Zimin ZHANG Yugui Faculty of Resources & Safety Engineering China University of Mining & Technology Beijing 100083 China School of Safety Science and Engineering Henan Polytechnic University Jiaozuo 454003 China

Based on the particularities of gas outbursts,i.e.,low gas bearing capacity and low gas pressure in the "Three Soft" coal seam in western Henan,we applied the theories of plate tectonics and regional structural evolution to investigate the mechanism of this seam and its impact on the coal seam gas *** investigation revealed that coal and gas outbursts are distributed in a strip in a NW direction,with a number of high-penetration mines scattered towards the south side and low-gas mines largely located on the north *** analyzed the statistics of 38 gas explosions and the rock-coal sturdiness number coefficient f of 167 sampling sites in the region and found the gas outburst mechanism that features a "low indicator outburst phenomenon".The mechanism is characterized by structural coal as its core,a low gas bearing capacity,low gas pressure and sturdiness coefficient f mostly less than *** research results provide a theoretical foundation for effective control of gas disasters.

关键词： coal and gas outburst mechanism investigation threshold sliding structure

Mechanism investigation on coal and gas outburst: An overview

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International Journal of Minerals,Metallurgy and Materials 2020年第7期27卷 872-887页

作者： Yan-kun Ma Bai-sheng Nie Xue-qiu He Xiang-chun Li Jun-qing Meng Da-zhao Song State Key Laboratory of coal Resources and Safe Mining China University of Mining and Technology(Beijing)Beijing 100083China Beijing Key Laboratory for Precise Mining of Intergrown Energy and Resources China University of Mining and Technology(Beijing)Beijing 100083China Xinjiang Institute of Engineering Urumqi 830023China School of Civil and Resource Engineering University of Science and Technology BeijingBeijing 10083China

coal and gas outburst is a frequent dynamic disaster during underground coal mining *** about 150 years of exploration,the mechanisms of outbursts remain unclear to *** on outburst mechanisms worldwide focused on the physicochemical and mechanical properties of outburst-prone coal,laboratory-scale outburst experiments and numerical modeling,mine-site investigations,and doctrines of outburst *** mechanisms are divided into two categories:single-factor and multi-factor *** multi-factor mechanism is widely accepted,but all statistical phenomena during a single outburst cannot be explained using present *** topics about outburst mechanisms are proposed by summarizing the phenomena that need precise *** most appealing research is the microscopic process of the interaction between coal and *** physical-chemical methods can help characterize the natural properties of outburst-prone *** experiments can compensate for the deficiency of first-hand observation at the *** the original outburst scene by constructing a geomechanical model or numerical model and reproducing the entire outburst process based on mining environment conditions,including stratigraphic distribution,gas occurrence,and geological structure,are *** studies can explore outburst mechanisms at the microscale.

关键词： coal and gas outburst outburst mechanism outburst model outburst simulation microscopic pore structure

Energy-limiting factor for coal and gas outburst occurrence in intact coal seam

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International Journal of Mining Science and Technology 2021年第4期31卷 729-742页

作者： Qingyi Tu Yuanping Cheng Sheng Xue Ting Ren Xiang Cheng State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep coal Mines Anhui University of Science and TechnologyHuainan 232001China Faculty of Safety Engineering China University of Mining and TechnologyXuzhou 221116China School of Civil Mining&Environmental EngineeringUniversity of WollongongNSW 2522Australia

This research reviewed the mechanics and gas desorption properties of intact coal,and tested the crushing work ratios of different intact coals,and then,studied the stress conditions for the failure or crushing of intact coal and the gas demand for the pulverization of intact coal *** a real-life outburst case is examined,the required minimum stress for intact coal outburst is *** study concludes that the crushing work ratios of three intact coal samples vary from 294.3732 to 945.8048 J/m^(2).For the real-life case,more than 2300 MJ of transport work is needed,and 10062.09,7046.57 and 5895.47 m^(3) of gas is required when the gas pressure is 1,2 and 3 MPa,*** crushing work exceeds the transport work and even reaches 13.96 times of the transport *** to provide such an enormous crushing work is an energy-limiting factor for the outburst in intact *** strain energy is needed for the crushing work,and the required minimum stress is over 54.35 MPa,even reaching 300.44 *** minimum stresses far exceed the in-situ vertical and horizontal stresses that can be provided at the 300–700 m mining depth range.

关键词： coal and gas outburst Intact coal Crushing work ratio Geological factors outburst energy

Response characteristics of gas pressure under simultaneous static and dynamic load:Implication for coal and gas outburst mechanism

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International Journal of Mining Science and Technology 2023年第2期33卷 155-171页

作者： Longyong Shu Liang Yuan Qixian Li Wentao Xue Nannan Zhu Zhengshuai Liu School of Energy and Mining Engineering China University of Mining and Technology-BeijingBeijing 100083China Mine Safety Technology Branch China Coal Research InstituteBeijing 100013China State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep coal Mines Anhui University of Science&TechnologyHuainan 232001China China coal Research Institute Beijing 100013China

coal and gas outbursts are dynamic disasters in which a large mass of gas and coal suddenly emerges in a mining space within a split *** interaction between the gas pressure and stress environment is one of the key factors that induce coal and gas *** this study,first,the coupling relationship between the gas pressure in the coal body ahead of the working face and the dynamic load was investigated using experimental observations,numerical simulations,and mine-site *** was observed that the impact rate of the dynamic load on the gas-bearing coal can significantly change the gas *** faster the impact rate,the speedier the increase in gas ***,the gas pressure rise was faster closer to the impact ***,based on engineering background,we proposed three models of stress and gas pressure distribution in the coal body ahead of the working face:static load,stress disturbance,and dynamic load ***,the gas pressure distribution and outburst mechanism were *** high concentration of gas pressure appearing at the coal body ahead of the working face was caused by the dynamic *** gas pressure first increased gradually to a peak value and then decreased with increasing distance from the working *** increase in gas pressure plays a major role in outburst initiation by resulting in the ability to more easily reach the critical points needed for outburst ***,the stronger the dynamic load,the greater the outburst initiation *** results of this study provide practical guidance for the early warning and prevention of coal and gas outbursts.

关键词： coal and gas outburst gas pressure Dynamic load outburst mechanism

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International Journal of coal Science & Technology 2018年第2期5卷 167-178页

作者： Bo Zhao Guangcai Wen Haitao Sun Dongling Sun Huiming Yang Jie Cao Linchao Dai Bo Wang College of Resources and Environment Science Chongqing University Shazheng Street Chongqing 400030 China coal Science and Industry Group Chongqing Research Institute Chongqing 40037 China State Key Laboratory of gas Disaster Monitoring and Emergency Technology Chongqing 40039 China

coal and gas outburst is one of the main gas hazards in coal mines. However, due to the risks of the coal and gas outburst, the field test is difficult to complete. Therefore, an effective approach to studying the mechanism and development of outburst is to conduct the similar physical simulation. However, the similarity criteria and similar materials in outburst are the key factors which restrict the development of physical simulation. To solve those problems, this paper has established similarity criteria base on mechanics model, solid-fluid coupling model and energy model, and presented high similar materials. Combining with three groups of similar number, and considering similar mechanical parameters and deformation and failure regularity, the similarity criteria of outburst is determined on the basis of the energy model. According to those criteria, we put forward a similar material consists of pulverized coal, cement, sand, activated carbon, and water. The similar material has high compressive strength and the accordant characteristics with the raw coal, include density, porosity, adsorption, desorption. The new research is promising for preventing and controlling gas hazards in the future.

关键词： coal and gas outburst Physical simulation Similarity criteria Similar material

Elimination mechanism of coal and gas outburst based on geo‑dynamic system with stress–damage–seepage interactions

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International Journal of coal Science & Technology 2023年第4期10卷 47-61页

作者： Lingjin Xu Chaojun Fan Mingkun Luo Sheng Li Jun Han Xiang Fu Bin Xiao College of Mining Liaoning Technical UniversityFuxin 123000China Energy Business Department Shanxi Lu’an Chemical GroupChangzhi 046200China Resource Department Liaoning Geology Engineering Vocational CollegeDandong 118000China

coal and gas outburst is a complex dynamic disaster during coal underground *** the disaster mechanism is of great signifcance for accurate prediction and prevention of coal and gas *** geo-dynamic system of coal and gas outburst is *** framework of geo-dynamic system is composed of gassy coal mass,geological dynamic environment and mining *** of stress–damage–seepage interaction for gassy coal mass is constructed to resolve the outburst elimination process by gas extraction with boreholes through layer in foor *** results show the occurrence of outburst is divided into the evolution process of gestation,formation,development and termination of geo-dynamic *** scale range of outburst occurrence is determined,which provides a spatial basis for the prevention and control of *** formation criterion and instability criterion of coal and gas outburst are *** formation criterion F1 is defned as the scale of the geo-dynamic system,and the instability criterion F2 is defned as the scale of the outburst *** to the geo-dynamic system,the elimination mechanism of coal and gas outburst—‘unloading+depressurization’is established,and the gas extraction by boreholes through layer in foor roadway for outburst elimination is *** the research case,when the gas extraction is 120 days,the gas pressure of the coal seam is reduced to below 0.4 MPa,and the outburst danger is eliminated efectively.

关键词： coal and gas outburst Geo-dynamic system Stress–damage–seepage coupling Elimination mechanism Instability criterion gas extraction

In-situ gas contents of a multi-section coal seam in Sydney basin for coal and gas outburst management

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International Journal of coal Science & Technology 2023年第4期10卷 34-46页

作者： Zhongbei Li Ting Ren Dennis Black Ming Qiao Itmam Abedin Jessica Juric Mike Wang School of Civil MiningEnvironmental and Architectural EngineeringUniversity of WollongongWollongongNSW 2522Australia South32–Illawarra Metallurgical coal WollongongNSW 2526Australia School of Safety Engineering China University of Mining and TechnologyXuzhou 221116China

The gas content is crucial for evaluating coal and gas outburst potential in underground coal mining. This study focuses on investigating the in-situ coal seam gas content and gas sorption capacity in a representative coal seam with multiple sections (A1, A2, and A3) in the Sydney basin, where the CO_(2) composition exceeds 90%. The fast direct desorption method and associated devices were described in detail and employed to measure the in-situ gas components (Q_(1), Q_(2), and Q_(3)) of the coal seam. The results show that in-situ total gas content (Q_(T)) ranges from 9.48 m^(3)/t for the A2 section to 14.80 m^(3)/t for the A3 section, surpassing the Level 2 outburst threshold limit value, thereby necessitating gas drainage measures. Among the gas components, Q_(2) demonstrates the highest contribution to Q_(T), ranging between 55% and 70%. Furthermore, high-pressure isothermal gas sorption experiments were conducted on coal samples from each seam section to explore their gas sorption capacity. The Langmuir model accurately characterizes CO_(2) sorption behavior, with ft coefcients (R^(2)) greater than 0.99. Strong positive correlations are observed between in-situ gas content and Langmuir volume, as well as between residual gas content (Q_(3)) and sorption hysteresis. Notably, the A3 seam section is proved to have a higher outburst propensity due to its higher Q_(1) and Q_(2) gas contents, lower sorption hysteresis, and reduced coal toughness f value. The insights derived from the study can contribute to the development of efective gas management strategies and enhance the safety and efciency of coal mining operations.

关键词： In-situ coal seam gas content Direct desorption method gas component Sorption capacity coal and gas outburst

Hazard prediction of coal and gas outburst based on the Hamming distance artificial intelligence algorithm (HDAIA)

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Journal of Safety Science and Resilience 2023年第2期4卷 151-158页

作者： Peng Ji Shiliang Shi College of Resource Environment and Safety Engineering Hunan University of Science and TechnologyXiangtan411201China Provincial Key Laboratoryof Safe Mining Technques of coal Mines Hunan Universityof Science and TechnoogyTaoyuan Road Yuhu District Xiangtan4112 China

Currently,coal mining faces the uncertainty of the risk of coal and gas outbursts and inaccurate prediction *** to this,an artificial immune algorithm(AIA)was developed for coal and gas outburst prediction based on the Hamming distance(HD)calculation method of antibody and antigen affinity called the Hamming distance artificial intelligence algorithm(HDAIA).The correlation matrix of coal and gas outburst indicators was constructed using the interpolation function in the *** HD algorithm was used to obtain the affinity between the antibody and antigen,and the minimum HD was screened to obtain the prediction *** collected dynamic data of the drilling cuttings gas desorption index Ki and the drilling cuttings weight S during the excavation process of the 11,192-working face of a coal mine in Guizhou Province,China,were used as prediction *** results indicate that the prediction result of the HDAIA for the risk of coal and gas outbursts is consistent with the actual risk of outbursts,and it has a good prediction of the risk of coal and gas *** HDAIA can be used as a novel method for predicting the risk of coal and gas outbursts.

关键词： coal and gas outburst Hammingdistance Artificial immune algorithm Risk prediction

Mechanical criterion for coal and gas outburst:a perspective from multiphysics coupling

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International Journal of coal Science & Technology 2021年第6期8卷 1423-1435页

作者： Ting Liu Baiquan Lin Xuehai Fu Ang Liu School of Safety Engineering China University of Mining&TechnologyXuzhou 221116China Key Laboratory of CBM Resources and Dynamic Accumulation Process China University of Mining&TechnologyXuzhou 221008China Department of Energy and Mineral Engineering G3 Center and EMS Energy InstituteThe Pennsylvania State UniversityUniversity ParkPAUSA

Although a series of hypotheses have been proposed,the mechanism underlying coal and gas outburst remains *** the low-index outbursts encountered in mining practice,we attempt to explore this mechanism using a multiphysics coupling model considering the effects of coal strength and gas mass transfer on *** on force analysis of coal ahead of the heading face,a risk identification index C_(m)and a critical criterion(C_(m)≥1)of coal instability are *** to this criterion,the driving force of an outburst consists of stress and gas pressure gradients along the heading direction of the roadway,whereas resistance depends on the shear and tensile strengths of the *** results show that outburst risk decreases slightly,followed by a rapid increase,with increasing vertical stress,whereas it decreases with increasing coal strength and increases with gas pressure *** the response surface method,a coupled multi-factor model for the risk identification index is *** results indicate strong interactions among the controlling ***,the critical values of the factors corresponding to outburst change depending on the environment of the coal seams,rather than being *** the buried depth of a coal seam increases,the critical values of gas pressure and coal strength decrease slightly,followed by a rapid *** to its controlling factors,outburst can be divided into stress-dominated,coal-strength-dominated,gas-pressure-dominated,and multi-factor compound *** on this classification,a classified control method is proposed to enable more targeted outburst prevention.

关键词： coal and gas outburst Critical criterion Multiphysics coupling Response surface method