单轴压缩下单一闭合裂纹对煤岩体破裂行为的影响
Effect of Single Closed Crack on Coal and Rock Mass Fracture Behavior Under Uniaxial Compression
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摘要: 基于断裂力学分析无限大板内单一闭合裂纹的破裂行为，根据以II型裂纹断裂准则为判据得到的单轴压缩下裂纹破裂强度的解析表达式，讨论裂纹倾角β、长度a和裂纹面摩擦系数fw对裂纹面强度的影响，并与以库伦-莫尔准则为判据的岩块破裂行为进行比较，探讨裂纹对煤岩体破裂行为的影响。结果表明，单轴压缩下含单一闭合裂纹煤岩体强度和破裂方式由裂纹面强度和岩块强度共同控制，裂纹倾角越接近破裂优势角βm、长度越大、裂纹面摩擦系数越小，裂纹面强度就越小，煤岩体就越有可能沿裂纹面破裂，其强度由裂纹面强度控制。Abstract: Based on the fracture behavior of single closed crack in infinite plate of fracture mechanics, the effect of crack orientation β, length a and friction coefficient fw on crack strength were discussed and compared with the fracture behavior of rock block by the Coulomb -Mohr's criterion according to type II crack's fracture criterion and analytical expression of the bursting strength of crack under uniaxial compression. The effect of crack on fracture behavior of coal and rock mass are discussed. The results show that the strength and the way of fracture of coal and rock mass with a single closed crack under uniaxial compression are controlled by the crack's strength and the strength of rock block; the more closer the crack orientation is to its dominance orientation βm of broken, the more larger the length is, the more smaller friction coefficient is, the smaller the strength of crack is and the more likely that coal and rock mass burst along the crack surface. Its strength is controlled by crack surface strength.
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Keywords:
- uniaxial compression /
- single closed crack /
- coal and rock mass /
- strength /
- fracture behavior
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