Study on the response mechanism characteristics of fault activation under the mining effect of thick coal seam

IF 2.1 3区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY
Song Yang (杨松) , Junguang Wang (王俊光) , Jie Chen (陈杰) , Bing Liang (梁冰) , Lingran Ren (任凌冉) , Tianyu Xin (辛天宇)
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引用次数: 0

Abstract

Aiming at the problem of fault activation instability induced by deep thick coal seam mining, taking 8404 working face of Madaotou Coal Mine in Datong Coalfield as the engineering background, the response mechanism of fault activation and crack evolution law under mining stress are revealed by using similar material simulation test and continuous-discrete coupling numerical simulation method. The results show that the risk of fault activation during thick coal seam mining significantly increases with a higher stress concentration coefficient, greater burial depth, and closer proximity of the working face to the fault. The smaller the fault dip angle, the higher the activation probability of the normal fault. Under mining conditions, the fault displacement exhibits progressive expansion, with a maximum displacement of 15.9 mm. The density of acoustic emission events increases in synchrony with the displacement rate. The fault activation process can be divided into three stages: distal response, local slip, and overall instability. The crack type in the fault zone changes from far-field tensile failure to near-field shear failure. The lower part of the fault is dominated by shear stress, and the amount of slip is significantly greater than that in the upper part. When the working face is located in the footwall of the fault, the lower part of the fault is most affected by mining. These research findings provide a theoretical basis for early disaster warning and prevention of fault activation during deep, thick coal seam mining.
厚煤层开采作用下断层活化响应机制特征研究
针对深部厚煤层开采诱发断层活化失稳问题,以大同煤田马道头煤矿8404工作面为工程背景,采用相似材料模拟试验和连续-离散耦合数值模拟方法,揭示了采动应力作用下断层活化的响应机制和裂缝演化规律。结果表明:随着应力集中系数的增大、埋深的增大、工作面离断层越近,厚煤层开采时断层活化的风险显著增大;断层倾角越小,正断层激活概率越高。采动条件下,断层位移呈渐进式扩展,最大位移为15.9 mm。声发射事件的密度随位移速率的增加而增加。断层激活过程可分为三个阶段:远端响应、局部滑动和整体失稳。断裂带的裂缝类型由远场拉伸破坏向近场剪切破坏转变。断层下部以剪切应力为主,且滑动量明显大于上部。当工作面位于断层下盘时,断层下部受采动影响最大。这些研究成果为深部厚煤层开采断层活化的早期灾害预警和预防提供了理论依据。
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来源期刊
Journal of Applied Geophysics
Journal of Applied Geophysics 地学-地球科学综合
CiteScore
3.60
自引率
10.00%
发文量
274
审稿时长
4 months
期刊介绍: The Journal of Applied Geophysics with its key objective of responding to pertinent and timely needs, places particular emphasis on methodological developments and innovative applications of geophysical techniques for addressing environmental, engineering, and hydrological problems. Related topical research in exploration geophysics and in soil and rock physics is also covered by the Journal of Applied Geophysics.
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