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基于断裂力学讨论裂隙岩体的强度一直是断裂力学与岩石力学等学科的重要课题。通过分析单个线性裂纹在压缩载荷作用下的剪切断裂条件,明确了压缩状态下张破裂剪切断裂韧性的物理意义及求解办法。使用复变函数和边界配置法求解了裂尖应力强度因子无量纲系数,进而对张破裂压剪准则进行了改进,使之更加便捷地进行有限裂纹体断裂的预测。基于修正的压剪判据推导了裂隙岩体试件的抗压强度求解公式,算例表明该文方法所建立的强度公式是准确、可靠的。最后,详细讨论了摩擦系数、裂隙倾角、裂隙长度、黏聚力以及围压对裂隙岩体试件抗压强度的影响机理。
Discussing the strength of fractured rock mass based on fracture mechanics has always been an important issue in the fields of fracture mechanics and rock mechanics. By analyzing the shear failure condition of a single linear crack under compressive load, the physical meaning and solution to the tensile fracture toughness of the sheet under compression are clarified. The complex function and the boundary collocation method are used to solve the dimensionless coefficient of stress intensity factor at crack tip, and then the fracture and compression shear criterion is improved, which makes it more convenient to predict the fracture of finite crack body. The formulas for solving the compressive strength of fractured rock mass specimens are deduced based on the revised compression shear criterion. The numerical results show that the strength formula established by the method is accurate and reliable. Finally, the influence mechanism of friction coefficient, crack dip angle, crack length, cohesion and confining pressure on the compressive strength of fractured rock mass specimens are discussed in detail.