摘要
工程岩体大多处于复杂的应力环境中。由于岩体裂纹走向相对于荷载方向的随机性，岩体脆性断裂多数由于Ⅰ-Ⅱ混合型裂纹的产生，因此研究岩石Ⅰ-Ⅱ混合型裂纹断裂有着非常重要的理论意义和工程价值。现行通用的适用于Ⅰ-Ⅱ混合型裂纹的断裂准则，如最大周向应力准则，即MTS（Maximum tangential stress criterion）准则，最小应变能密度准则，即SED（Minimum strain energy density criterion）准则，最大应变能释放准则，即G（Maximum energy release rate criterion）准则，均未考虑T应力的影响。本文通过理论分析，ABAQUS数值模拟，反对称四点弯曲实验研究三个方面探究T应力对裂纹起裂扩展到影响。
Cracked rock masses are usually subjected to complex loading conditions. Because of arbitrary orientation of cracks relative to the loading directions, brittle fracture in rocks may occur due to a combination of two major fracture modes, i.e. crack opening mode （mode I） and crack sliding mode （mode II）. Therefore, the studying of rock fracture on Ⅰ-Ⅱ mixed mode has important Theoretical significance and work value. Current widely used fracture criterion for Ⅰ-Ⅱ mixed mode crack, such as MTS （Maximum tangential stress criterion）, SED （Minimum strain energy density criterion）, G （Maximum energy release rate criterion） have not consider the effect of T-stress. This paper has studied the effect of T-stress on the crack growth and propagation through Theoretical analysis, ABAQUS finite element method simulation, experiment studying by anti-symmetric four-point bend specimen.
基金
国家973项目,2010CB732005
151111省科技计划项目（2014JY0002）
油气藏地质及开发工程国家重点实验室资助项目（PLN1202）1
