Deep hard rock damage evolution constitutive model establishment method

Abstract

The invention provides a deep hard rock damage evolution constitutive model establishment method, which comprises the following steps of firstly, establishing a deep rock damage constitutive model considering residual stress characteristics, and introducing a correction coefficient reflecting a stress drop rate based on the established deep rock damage constitutive model considering the residual stress characteristics, constructing a damage constitutive model considering the stress drop rate and the stress drop amplitude, based on the constructed damage constitutive model considering the stress drop rate and the stress drop amplitude, deducing a theoretical formula of damage constitutive model parameters, and carrying out a deep hard rock mechanical test, and verifying the damage constitutive model. According to the deep hard rock damage evolution constitutive model establishment method provided by the invention, the established model can accurately reflect the characteristics of high stress drop rate and large amplitude of the deep hard rock in a strain softening stage, and the influence rule of Weibull parameters and correction coefficients on theoretical curve morphological characteristics can be obtained by analyzing the model.

Description

technical field [0001] The invention relates to the technical field of geotechnical engineering, in particular to a method for establishing a constitutive model of damage evolution of deep hard rock. Background technique [0002] Rock is a heterogeneous geological material with complex constitutive relations. Its research has always been an important aspect of rock mechanics and geotechnical engineering, and has been generally valued by engineering circles. The constitutive model is the foundation of geotechnical engineering mechanics calculation. Due to the unreasonable construction of the constitutive model, geotechnical engineering accidents, waste of mine resources and economic losses of geotechnical engineering often occur. Therefore, in-depth research on constitutive models is the basis for ensuring rational design, safe construction, and ensuring benefits of geotechnical engineering, and has important scientific research significance and engineering application value....

AI Technical Summary

Problems solved by technology

In the existing technology, when constructing the constitutive model of damage evolution of deep hard rock, the influence of the stress drop rate is often ignored, resulting in inaccurate model construction. Therefore, a damage constitutive model that considers the stress drop rate and the stress drop amplitude is designed. method is very necessary

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