加载条件下裂隙间相互作用对断续裂隙岩体变形的影响  

CRACK INTERACTION EFFECT ON DEFORMATION OF ROCK MASSES WITH INTERMITTENT JOINTS SUBJECTED TO COMPRESSIVE LOADINGS

作　　者：张永兴[1] 周小平[1] 朱可善[1] 

机构地区：[1]重庆大学土木工程学院,重庆400045

出　　处：《工程力学》2005年第2期218-223,共6页Engineering Mechanics

摘　　要：裂隙岩体的稳定性和变形特性主要决定于裂隙,同时裂隙间的相互作用对岩体的稳定和变形产生显著的影响。为此利用位错模型法、叠加原理和伪力的Lengdre 多项式展开研究了加载情况下裂隙间的相互作用问题。利用该方法可以计算弯折裂纹和平行排列的裂纹尖端的应力强度因子和裂纹相互作用对应变的影响。给出了许多复杂的算例,对单一断裂和X 断裂问题,计算结果表明单一断裂比X 型断裂更不稳定;对平行排列的弯折裂纹,应变依赖于裂隙的几何形状、几何和物理参数。含单一断裂岩体的应力应变曲线和裂隙的几何和物理参数有关。Crack interaction is critical to the stability and deformation of rock masses. An accurate and efficient numerical method for solving the crack-crack interacting problem is presented. The method is developed based on dislocation model, stress superposition principle and the Legendre polynomial expansion of the pseudo-traction. It can be used to compute the stress intensity factors of multiple kinked cracks and multiple rows of periodical cracks as well as the overall strains of rock masses containing the multiple cracks under loadings. Many computing examples are given. Numerical results for single faults and crossed faults show that single faults are more unstable than crossed faults. For the problem of multiple rows of periodical cracks, the dependence of the overall strains on the crack configuration and the geometrical and physical parameters is investigated. It is found that the predicted stress-strain curves for rock masses containing single faults are sensitive to the geometrical and physical parameters.

关 键 词：裂隙间的相互作用 加载 断续裂隙岩体 变形 单一断裂 X断裂 平行排列裂隙 

分 类 号：TU452[建筑科学—岩土工程]