充填开采下不同充填率控制围岩运移变形的数值模拟研究

Numerical Simulation Study on Migration and Deformation of Surrounding Rock Controlled by Different Filling Ratio under Filling Mining

本文通过数值模拟方法对充填体不同充填率情况下的采场覆岩变形进行分析,同时对地表变形情况进行评估,认为当充填体充填率为85%时,虽然采空区边缘位置为减压区,但采空区中间范围已达应力平衡态,采场覆岩稳定性较高;覆岩在充填体的支撑作用下变形量和变形速率大为减缓,岩层较为完整,孔隙率较低。

In this paper,the deformation of overlying rock in stope under different filling ratio is analyzed by numerical simulation method,and the surface deformation is evaluated at the same time. It is considered that when the filling ratio is 85%,although the edge of the goaf is a pressure-reducing area,the middle range of the goaf has reached the stress equilibrium state and the stability of the overlying rock in the stope is high,the deformation amount and deformation rate of the overlying rock are greatly slowed down under the support of the filling body,the rock strata are relatively complete and the porosity is low.