A method and apparatus for construct a new rock mass damage constitutive model

Abstract

The invention relates to a new rock mass damage constitutive model construction method, comprising the following steps: step S10: based on strain equivalence principle, adding a bearing capacity coefficient of a damaged material to obtain a modified rock damage constitutive model; Step S20, respectively calculating a macro damage tensor of the joint and a micro damage variable of the micro crack,and establishing a mechanical model of the macro damage and the micro damage of the joint rock according to the superposition principle; Step S30: According to the damage mechanics theory, constructinga rock mass damage constitutive model with coupling of macroscopic defects and microscopic defects. The novel rock mass damage constitutive model construction method and device provided by the invention provide a simple principle, The damage constitutive model of rock mass, which is easy to operate and low in cost, is reasonable and reliable considering the coupling of macroscopic and microscopicdefects. The mining range can be delineated accurately and reasonably by using the damage constitutive model in the design of excavation slope engineering.

Description

technical field [0001] The invention relates to the field of geotechnical engineering constitutive model research, in particular to a novel rock mass damage constitutive model construction method and device. Background technique [0002] Rock is a kind of natural geological material, which contains various randomly distributed defects inside. Under the action of external load, these defects will multiply and develop, and the mechanical properties of the internal structure of rock will also change continuously. The damage and failure process of rock is actually from microscopic structural failure to the formation of microscopic defects, and finally develops into the penetrating failure of macroscopic cracks, which is actually a process from quantitative change to qualitative change. Statistical damage mechanics is an effective method to study rock fracture process. [0003] In elastic damage analysis, the distribution function of quasi-brittle material properties cannot be d...

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Problems solved by technology

It is assumed that the strain of the damaged part is coordinated with the strain of the undamaged part. However, during the loading process, new micro-cracks are continuously generated in the rock, and the original initial cracks will also continue to expand, penetrate and even form macro-cracks. The size and density of cracks in the rock are different. There will be changes, and correspondingly new effects will be produced on the deformation inconsistency of each part of the rock. There is still a large gap between the established model curve and the test curve, and the relationship between the damaged part and the void is not considered. Because the research on the two parts of the void and the skeleton is not perfect, it is necessary to further improve the simulation research on the whole process of rock deformation based on the damage theory

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