压剪应力条件下岩体裂纹扩展概率模型研究  

The probabilistic failure model of rock mass under compressive stress states

作　　者：刘东燕[1] 严春风[1] 陈彦峰 

机构地区：[1]重庆建筑大学岩土工程研究所

出　　处：《岩土工程学报》1999年第1期56-59,共4页Chinese Journal of Geotechnical Engineering

摘　　要：经典Ｗｅｉｂｕｌ统计断裂理论从统计的角度建立了拉剪应力条件下裂纹扩展的统计断裂模型。而岩体工程中的断续节理岩体的裂纹有相当一部分是处于压剪应力作用下，应用经典Ｗｅｉｂｕｌ统计断裂理论建立的裂纹扩展概率模型是不适宜的。本文对断续节理岩体中压剪应力条件下裂纹扩展的随机性从断裂力学角度进行了研究，建立了压剪应力条件下裂纹的断裂力学概率模型，并讨论了节理岩体的失效概率与裂纹几何、力学各参数之间的关系。Rock mass with intermittent joints can be treated neither as a distinct block structure nor as a complete continuous medium.So the usual stochastic model of block theories or continuum theories can not be used.Since both rock bridges and joints are present in rock masses,the failure probability of rock masses is related to their statistical properties. After the probability distributions of strength parameters for joints and rock are proposed,the stochastic model of fracture is inferred in this paper.The susceptibility of several joint parameters in strength criterion is analyzed.Finally,a suggestion for geotechnical engineers is represented in the paper.

关 键 词：岩体 随机模型 断裂 裂纹扩展 失效概率 

分 类 号：TU452[建筑科学—岩土工程]