双轴压缩下组合裂纹的动态扩张实验研究
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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。
In this paper,the propagations and rupture characteristics of some typical combined cracks in thephysics 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.
引文
1卿新林,宋锦良,冯德益,蒋淳.压剪应力场中裂纹扩展的动态光弹性研究.西北地震学报,1992,14(2).2RiceJR.Mathematicalanalysisinthemechanicsoffracture.Fracture(Vol.Ⅱ),NewYork:H.Libowitz,AcademicPress,1968.191.3杜家吉.动态张开型裂纹扩展的动光弹分析.天津大学学报,1985,4.4王建华,宋锦良.受压剪应力作用闭合裂纹的光弹性研究.地震学报,1990,12(l).5郭增建.震源物理.北京:地震出版社,1979.6耿大玉.关于发震断层与静止断层交遇的讨论.西北地震学报,1986,8(1).7谷继成.强余震的时间分布特征及其理论解释.地球物理学报,1979,22(1).

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