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基于岩石内部裂隙和孔隙分布的随机性,运用连续损伤力学理论,建立了围压与轴压共同作用下岩石的统计损伤模型;结合岩石应力应变曲线的特征参量确定了模型参数,增强了模型的适应性;探讨了岩石损伤的演化性态及其宏观表现,并通过试验对模型进行了验证.结果表明:岩石的宏观力学特性取决于内部微裂纹的细观力学响应,其损伤演化途径反映了岩石变形破坏的全过程;模型理论曲线与试验实测曲线具有较高的吻合度,验证了模型的合理性.
Based on the randomness of fissure and pore distribution in rock, a statistical damage model of rock under confining pressure and axial compression is established by using continuous damage mechanics theory. The parameters of rock stress-strain curve are established to determine the model parameters and enhance the model’s Adaptability, the evolutionary state of macroscopic damage and its macroscopic behavior are discussed, and the model is validated by experiments.The results show that the macroscopic mechanical properties of rock depend on the micromechanical response of microcracks, and the damage evolution pathway reflects Rock deformation and destruction of the whole process; model theoretical curve and experimental measured curve has a high agreement, verify the rationality of the model.