地震地质 ›› 2000, Vol. 22 ›› Issue (2): 179-186.

• 构造物理 • 上一篇    下一篇

地下水对震源体应力、应变场的影响--以唐山地震为例

孙君秀, 刘五州, 车用太   

  1. 中国地震局地质研究所,北京 100029
  • 收稿日期:1999-10-31 修回日期:2000-02-29 出版日期:2000-06-14 发布日期:2009-11-25
  • 基金资助:
    地震科学联合基金资助(9507433);中国地震局地质研究所论著2000B0020

EFFECT OF UNDERGROUND WATER ON THE STRESS AND STRAIN FIELD IN EARTHQUAKE FOCI --A CASE OF TANGSHAN EARTHQUAKE

Sun Junxiu, Liu Wuzhou, Che Yongtai   

  1. Institute of Geology, China Seismological Bureau, Beijing 100029
  • Received:1999-10-31 Revised:2000-02-29 Online:2000-06-14 Published:2009-11-25

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

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