裂隙随机分布时岩体力学性质对应力状态的依附性

在不考虑裂隙相互作用和裂隙断裂扩展并假设裂隙随机分布的情况下，运用线弹性断裂力学理论和闭合裂隙模型探讨了在三轴压缩、单轴压缩以及单轴拉伸3种情况下裂隙岩体变形模量的变化规律。对裂隙岩体变形而言，裂隙密度参数和裂隙面摩擦系数是最重要的2个影响因素。随着裂隙密度参数的增加，变形模量有减小的趋势；随着裂隙摩擦系数的增加，变形模量有逐渐增加的趋势。通过计算分析可以看出，三轴压缩时的变形模量最大，单轴压缩时的次之，单轴拉伸时的最小。

DEPENDENCE OF MECHANICAL PROPERTIES ON STRESS STATES OF ROCK MASS WITH RANDOMLY DISTRIBUTED CRACKS

With no account of crack extension and crack interaction and with the prerequisite of random distribution of cracks,the linear elastic fracture mechanics and closed slipping crack model are used to analyze the variation of deformation moduli of fractured rock mass under triaxial compressive stress,uniaxial compressive stress and uniaxial tensile stress,respectively. For the deformation of fractured rock mass,crack density parameter and crack friction coefficient are the most important parameters. The deformation moduli increase with increment of crack friction coefficient and decrease with increment of crack density parameter. According to computation and analysis for the three stress states,the deformation modulus at uniaxial tensile stress is the least,that at triaxial compressive stress is the biggest,and that at uniaxial compressive stress is the middle.