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覆岩破坏引起稳态电场特征发生变化，其主要变化的电性参数是电阻率。通过建立煤层开采前后覆岩电性参数变化的数学模型，利用二维有限单元法进行覆岩破坏前后电阻率分布的数值模拟。计算结果表明：电阻率的变化主要由覆岩破坏后产生裂隙带和冒落带的岩石电性特征变化引起，从而为利用电阻率法监测覆岩破坏奠定了理论基础
The failure of the overlying strata causes the steady-state electric field to change, and the main electrical parameter is the resistivity. Through the establishment of the mathematical model of the electrical parameters of the overlying strata before and after mining, the two-dimensional finite element method is used to simulate the resistivity distribution before and after the overlying strata are destroyed. The calculation results show that the change of resistivity is mainly caused by the change of electrical characteristics of rock produced by the fracture zone and the caving zone after the failure of the overburden rock, which lays a theoretical foundation for the monitoring of the overlying rock damage by the resistivity method