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为研究采煤造成的采场底板岩层变形与破坏状况,在采深近千米的深井采场进行了大范围、长时期的底板岩层移动、超前支承压力和底板岩层渗透性等多项观测。根据位移实测资料和原始地应力实测统计资料,采用位移反分析方法,反求出了岩体的弹性模量和支承压力,得出岩体的弹模是其对应岩石试件室内测试弹模的0.445倍,超前支承压力是垂向原始地应力的1.7倍。本文还探讨了底板岩层的应力分布和开采造成的底板岩层扰动范围。
In order to study the deformation and damage of underground rock strata caused by coal mining, a series of observations such as large-scale, long-term floor rock movements, advanced bearing pressure, and floor rock permeability were carried out in deep wells with depths of nearly 1,000 meters. According to the displacement measurement data and the original ground stress measured statistical data, using the displacement back analysis method, the elastic modulus and the bearing pressure of the rock mass were obtained inversely, and the elastic modulus of the rock mass was found to be the corresponding elastic modulus of the rock sample in the room. 0.445 times, the leading bearing pressure is 1.7 times of the vertical original ground stress. This paper also discusses the stress distribution of the floor rock and the range of floor rock disturbance caused by mining.