微裂隙对工程岩体强度参数的影响分析

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摘要通过分析压剪微裂隙尖端应力场，对含微裂隙岩体的起裂强度进行估算。计算结果表明，岩体起裂强度与微裂隙和最大主应力夹角以及围压的大小有关。当围压增加时，岩体的起裂强度增大，起裂角减小；当围压一定时，仅当微裂隙与最大主应力夹角在阀值范围内时，其才对岩体的起裂强度产生影响，并且随着围压的增加，该阀值的范围将逐渐减小；此外，微裂隙的持续扩展也需施加较高的应力。因此，对于浅表工程岩体，岩体破坏主要受贯通裂隙控制，采用数值分析方法时可以忽略微裂隙对岩体力学特性的影响。

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关键词 ：岩石力学, 压剪微裂隙, 起裂判据, 强度参数

Abstract：By analyzing the tip stress field of compressive-shear microcrack，the initiation strength of rock mass containing crack is estimated. The results show that the initiation strength of rock mass has a relationship to the angle between microcrack and the orientation of the maximum principal stress and confining pressure. When the confining pressure increases，the initiation strength increases，but the initial angle will decreases. Only when the angle between the microcrack and the orientation of the maximum principal stress is in a certain range，the microcrack has an effect on the initiation strength of rock mass，and this range will reduce with the increasing confining pressure. Furthermore，the microcrack needs high applied force to keep propagating. Therefore，the failure of shallow engineering rock mass is mainly controlled by the penetrated cracks. The influence of microcracks on the mechanical behaviour of rock mass can be neglected when using the numerical methods.

Key words： rock mechanics compressive-shear microcrack initiation criterion strength parameters

收稿日期: 2010-05-24

引用本文:

范雷，周火明，张宜虎. 微裂隙对工程岩体强度参数的影响分析[J]. 岩石力学与工程学报, 2011, 30(S1): 2703-2709.
FAN Lei，ZHOU Huoming，ZHANG Yihu. INFLUENCE OF MICROCRACKS ON STRENGTH PARAMETERS OF ENGINEERING ROCK MASS. , 2011, 30(S1): 2703-2709.

链接本文:

http://www.rockmech.org/CN/Y2011/V30/IS1/2703

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