Research on the Effect of Dip Angle on Shear Stress on Normal Fault Plane and Water Inrush in Floor Strata During Mining Activities
Research on the Effect of Dip Angle on Shear Stress on Normal Fault Plane and Water Inrush in Floor Strata During Mining Activities
复制标题
DOI：
10.1007/s10706-020-01282-w
复制
发表时间：
2020-03
影响因子：
1.7
通讯作者：
W. Bu;Hui Xu
中科院分区：
文献类型：
--
作者：
W. Bu;Hui Xu
本文用力学模型研究了正断层面上的剪应力特征，用数值模型研究了开采过程中底板岩层突水的特征。利用弹性力学中均质半平面在正态分布力作用下的解，得到断层面上的剪应力公式。该力学模型反映了断层面上剪应力随断层面倾角的变化规律，并根据剪应力的大小分析了断层的活化情况。在此基础上，利用RFPA 2D-Flow软件对底板岩层裂隙分布和渗流分布进行了数值模拟，探讨了倾角对底板岩层突水的影响。研究结果表明，倾角越小，越容易在底板岩层与正断层之间产生连通裂隙，为类似地质条件下的剩余煤柱研究提供了重要依据。
This paper presents an investigation on the characteristics of shear stress on normal fault plane by employing the mechanical model and the characteristics of water inrush from floor strata during mining activities by employing numerical model. The shear stress formula on fault plane is obtained by using the solution of a homogeneous half-plane affected by normally distributed forces in the theory of elasticity. The mechanical model shows the variation of shear stress on fault plane with different dip angle and fault reactivation is analyzed according to the shear stress. Based on these, the fracture distribution and seepage distribution on floor strata are numerically simulated by using the RFPA2D-Flow software, and the effect of dip angle on water inrush from floor strata is discussed. These results indicate that the smaller value of dip angle is easier to be reactivated and to produce connecting fractures between floor strata and normal fault comparing with the larger value of dip angle, which provide significant insights into remaining coal pillar with similar geological conditions.