College of Energy Engineering, Xi'an University of Science and Technology
Key Laboratory of Western Mine Mining and Disaster Prevention, Ministry of Education, Xi'an University of Science and Technology
Key Laboratory of Coal Resources Exploration and Comprehensive Utilization, Ministry of Natural Resources

以宽沟缓倾斜煤层I010203工作面为研究背景,结合理论分析、数值模拟等手段对工作面过断层的位移场、应力场变化规律进行了研究,并根据现场监测数据,得到以下结论:(1)根据超前支承压力理论计算与现场实测,将采煤工作面过断层分为3个开采区域,正常开采区域、超前影响区域与断层影响区域,工作面推进过程中微震能量变化由“低频次、高能量”→“低频次、低能量”→“高频次、高能量”;(2)受I010203工作面倾斜角度的影响,工作面运输巷微震能量事件多于工作面回风巷,同时根据采煤工作面微震能量事件分析,在采掘扰动作用下工作面极易发生两种冲击类型事故,断层活化型冲击和断层煤柱型冲击;(3)当采煤工作面距断层较远时,构造应力在采掘扰动作用下释放,微震总能量相对活跃,应力表现为应力显现阶段,随着工作面逐渐推进至断层,微震总能量由稳定阶段转变为活跃阶段,同时断层活化显现由蓄能阶段转变为断层活化阶段;(4)分析宽沟I010203采煤工作面数值模拟结果得到,工作面逐渐向断层推进过程中,其断层接触面由初始活化阶段转变为活化稳定阶段,最终接近断层时表现为活化加剧阶段,其与采煤工作面期间微震大能量事件变化规律基本吻合。

Taking the working face of I010203 in the gently inclined coal seam of Kuangou as the research back-ground, combining theoretical analysis, numerical simulation and other means to carry out relevant research on the change rule of displacement field and stress field of the working face over the fault. And based on the site monitoring data, the following conclusions were drawn: (1) According to the theoretical calculation of the over-running support pressure and on-site measurement, the back-mining face over the fault is divided into three min-ing areas: normal mining areas, areas affected by overshooting and areas affected by faults, respectively. Micro-seismic energy changes from ''low frequency, high energy'' to ''low frequency, low energy'' to ''high frequency, high energy'' during the advancement of the working face; (2) Due to the influence of the tilt angle of the working face of I010203, the microseismic energy events in the lower trench of the working face are more than those in the upper trench, and at the same time, according to the analyses of the microseismic energy events in the mining face. Under the action of mining disturbance, the working face is very prone to 2 types of impact accidents, respectively, fault activation type impact and fault coal pillar type impact; (3) When the mining face is far away from the fault, the tectonic stress is released under the effect of mining disturbance, and the total microseismic energy is relative-ly active. Stress manifests itself in the stress manifestation stage, and as the working face gradually advances to the fault, the total microseismic energy changes from a stable order to an active stage, while the fault activation manifests itself from an energy storage stage to a fault activation stage; (4) Numerical simulation is established for the back-mining face of I010203 in Kuangou, and the analysis shows that the fault contact surface of the workface changes from the initial activation stage to the activation and stabilisation stage in the process of the workface gradually advancing towards the fault. Eventually close to the fault when the activation of the intensification phase, the numerical simulation established and the working face back to mining during the microseismic large energy event change rule is basically consistent.

国家自然科学基金资助项目(51874231);陕西省创新能力支撑计划资助项目(2020KJXX–006);陕西省自然科学基础研究计划企业联合基金资助项目(2019JLZ–04)

崔峰,陆长亮,王昊,等.缓倾斜煤层坚硬顶板断层活化微震时空演化规律及诱冲机制[J].采矿与岩层控制工程学报,2024,6(3):033036.

CUI Feng, LU Changliang, WANG Hao, et al. Spatio-temporal evolution of microseismic activation of hard-roof faults in gently dipping coal seams and the mechanism of induced shocks[J]. Journal of Mining and Strata Control Engineering, 2024, 6(3): 033036.