Construction method suitable for rock damage constitutive model under cyclic load

Abstract

The invention discloses a construction method suitable for a rock damage constitutive model under the cyclic load. The method comprises the following steps of solving an elastic-plastic matrix on thebasis of a secondary loading surface theory and a modified CWFS model; and establishing an equation suitable for the rock damage constitutive model under the cyclic load. The method aims to accuratelydescribe the nonlinear mechanical behaviors of a rock material under the cyclic load, comprising a hysteretic ring, the accumulated plastic strain and a damage effect, and the secondary loading surface theory has been successfully applied to the metal, soil and concrete, so that a new path is opened up for establishing the rock damage constitutive model under the cyclic load based on the secondary loading surface theory in combination with a Ducker-Prager yield criterion and by adopting the modified CWFS model.

Description

technical field [0001] The invention belongs to the technical field of geotechnical engineering, and in particular relates to a method for constructing a constitutive model of rock damage under cyclic loading. Background technique [0002] In engineering fields such as transportation, construction, mining and water conservancy, cyclic loads and fatigue problems are often encountered. The strength and deformation laws of rocks under cyclic loads are significantly different from those under static loads. Therefore, studying the mechanical properties of rock under cyclic loading is of great significance to the long-term stability evaluation of engineering, and the establishment of a damage constitutive model suitable for rock under cyclic loading is the basis for carrying out long-term stability evaluation of rock engineering. It is one of the important issues that urgently need to be solved in rock engineering design. [0003] At present, there are many researches at home and...

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Problems solved by technology

[0006] (1) At the experimental level, there are many studies on the macroscopic mechanical properties of rocks under cyclic loading, and there are few studies on damage mechanical properties through the establishment of rock damage constitutive models under cyclic loading;

[0007] (2) The current technical scheme mainly considers the deformation and strength characteristics separately, and does not comprehensively consider the deformation characteristics such as hysteresis loop and cumulative plastic strain and the strength characteristics such as damage effects of the rock under cyclic loading;

[0008] (3) So far, the secondary loading surface theory has been successfully applied to metal, soil and concrete. However, there is no relevant research on the application of rock, and the theory does not consider the damage effect.

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