A new practical model for the evolution of post-peak strength parameters of rocks
This paper focuses on the evolution of rock post-peak strength parameters and practical models.The tri-axial compression test results of 32 kinds of rocks are collected from published literatures,and the stress-strain curve in the post-peak softening stage is simplified to a straight line.Based on the Mohr-Coulomb criterion,the general evolution laws of the post-peak strength parameters of different kinds of rocks are studied and analyzed,and a new practical strength parameter evolution model is established based on standardized plastic internal variables.The established strength parameter evolution model is then embedded in ABAQUS to simulate the post-peak strain softening process of rocks.The results of the tri-axial compression tests of various rocks are used to compare and check the calculation.The results show that the calculated post-peak stress-strain curves are basically consistent with the experimental curves,which indicates the correctness of the established model.With simple form,few parameters and wide applicability,the model is expected to be widely used in practical engineering deformation and stability calculation and analysis.The research has theoretical and engineering practical values.
rock mechanicspost-peak strain softeningstrength parametersevolution model
NETL
NSTL
万方数据
维普
