Abstract: We have made numerical simulation by the finite element method to study interaction between vadose field and stress field and to understand the effect of underground water to deformation in the seismic source area. The resalts indicate that the shear strength and frictional resistance of rocks decrease with increasing pore pressure, while shear stress becomes greater around the fault. The pore pressure also causes changes of strain distribution. These mechanical effect of underground water may be associated with source processes of earthquakes.

Key words: Underground water, Vadose, Seismic source, Numerical modeling

摘要： 通过数值模拟,研究渗流场和应力场相互作用,了解在震源区地下水对应力场和应变场的影响。结果表明,岩石的抗剪强度及摩擦阻力随孔隙压力的增加而降低,孔隙压力使应变分布发生变化,断层及其附近剪切应力升高。地下水的这些效应可能与地震震源过程有关。

关键词: 地下水, 渗流, 地震震源, 数值模拟