地震地电阻率各向异性变化数值模拟

Numerical simulation of seismic anisotropy variation of earth resistivity

将APE模式中差应力与裂隙的演化理论与前期研究中建立的张量形式的各向异性电性模型相结合,推导出了裂隙演化参数(密度、孔压、纵横比、闭合角)与电导率关系的动态方程,用数值模拟方法研究了饱水岩石在水平向应力作用下电阻率的各向异性变化,并结合实验和观测结果,讨论了电阻率各向异性变化的可能机理。

In this paper dynamic equations of anisotropy variation of earth resistivity caused by earthquake preparation is derived by combining the evolution theory of earth rock cracks due to the affecting of differential stress, described by APE model(anisotropy porous elasticity),with the electrical anisotropy tensor model established in our early research.The dynamic equations include cracks parameters such as porosity pore pressure,aspect ratio and closure angle.For this dynamic model the seismic anisotropy variation of earth resistivity in saturated rocks under the affect of horizontal stress is numerically simulated.According to experimental results and practical observations,the numerical simulation results and the possible mechanism of anisotropy variation of earth resistivity are discussed in detail.