最大主应力偏转与集中对断层活化失稳的影响
Influence of Maximum Principal Stress Deflection and Concentration on Fault Activation Instability
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摘要: 为研究断层附近最大主应力对断层活化失稳的影响,以济三煤矿KF76断层为工程背景,利用FLAC3D软件建立数值分析模型,分别在断层上下盘进行开挖模拟,分析随着工作面的推进断层附近最大主应力方向和大小的变化。结果表明:断层随工作面的推进活化趋势不断增大,在断层下盘开挖时,工作面距断层40 m,断层发生活化;随着工作面向断层推进,断层附近最大主应力偏转与集中现象不断加剧,范围不断扩大;与断层上盘相比,在断层下盘开挖工作面,最大主应力偏转与集中现象均更加明显,影响范围更大,更易引起断层活化失稳。Abstract: To explore the effect of maximum principal stress near fault on fault activation instability, this paper takes KF76 fault of Jisan Mine as the engineering background, uses FLAC3D software to build a numerical analysis model to carry out the excavation simulation on the upper and lower plates of the fault respectively and analyze the changes in the direction and magnitude of the maximum principal stress near the fault with the advance of the working surface. Research shows that: the trend of fault activation increases with the advancing of working face, when the footwall is excavated, the working face is 40 m away from the fault, the fault is active; the maximum principal stress deflection and concentration near the fault are intensified and the range is enlarged with the advancing of working face towards the fault; compared with the hanging wall of the fault, in the foot wall mining, the maximum principal stress deflection and concentration are more apparent, the influence range is larger, and the activation of the fault is more likely to occur by the mining of the foot wall.
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