双轴压缩下组合裂纹的动态扩张实验研究

DYNAMIC PRORAGATIONS OF COMBINED CRACKS UNDER BIAXIAL COMPRESSION

摘要:

本文运用动态光弹性技术,实验研究了几种与地震孕育构造背景相近的组合裂纹在双轴压缩下的扩展规律,对裂纹扩展路径、稳定性作了分析,并与单轴压缩情况进行了对比,同时还研究了摩擦力对裂纹扩展的影响。通过上述研究,得出了压剪应力场中裂纹稳定扩展等结论。

Abstract:

In this paper,the propagations and rupture characteristics of some typical combined cracks in the physics of earthquake focus,under biaxial compression, are studied by means of dynamic photoelastic-ity. The crack paths and propagation stability are analysed,comparing with the uniaxial compression. In the meanwhile,the effect of opposite crack face friction on crack propagation is studied.Some con-clusions,such as crack stable propagation in a compression-shear stress field,are obtained.