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与时间相关的岩石扩容现象源于岩体内部大量微裂纹的张性扩展。从断裂力学的裂纹研究出发,探讨不均匀加卸载过程中,岩体内部微裂纹在应力集中源附近的局部拉应力作用下,裂隙萌生和扩展的动态过程,并利用散布损伤力学手段描述裂纹体系的动力行为,建立起微观断裂与宏观扩容之间的联系。试验结果分析表明:本文所建立的扩容方程能够有效地描述加卸载过程中裂隙岩体的动态损伤演化和体积扩容全过程,与已有的形变方程一同构成深部岩体变形破坏动态本构模型的完备方程组。
The time-dependent rock dilatancy results from the large number of microcracks stretching within the rock mass. Based on the study of fracture mechanics, the dynamic process of fissure initiation and propagation under the local tensile stress near the stress concentration source is discussed in the process of inhomogeneous loading and unloading. The crack damage mechanics is used to describe the crack system The dynamic behavior, the establishment of micro-fracture and the link between the macro-expansion. The experimental results show that the expansion equation established in this paper can effectively describe the whole process of dynamic damage evolution and volume expansion of fractured rock mass during loading and unloading, and together with the existing deformation equations, constitute the dynamic constitutive model of deep rock mass deformation and failure Complete equations.