Three dimensional image of stress space geotechnical constitutive model

Abstract

There are various discontinuities in geotechnical engineering problems, which can be roughly divided into two types: one is the discontinuities formed by various actions of rock and soil, such as joints, faults, fissures and shear failure surfaces in rock mass; The other is the contact surface between geotechnical structures such as various foundations, retaining structures, underground structures and geotechnical bodies. Therefore, we cannot ignore its existence in computation. At present, the finite element method and other numerical methods have been widely used to solve geotechnical engineering problems, but the solution of the above discontinuous deformation problems has not been well solved. In this paper, the constitutive model of rock and soil is established. Based on the theory of image processing technology, the common methods of dealing with discontinuous deformation problems in finite element method are pointed out, and the unreasonable points are pointed out. It is more reasonable to treat such problems as contact problems, because it can reflect the main characteristics of discontinuous deformation surface. Come on. The three-dimensional image of the constitutive model has three important functions: (1) it is helpful to enhance the theory of constitutive theory and lay a foundation for further mastery of the theory of constitutive theory; (2) Abstract constitutive theory is no longer just a bunch of boring formulas, which is helpful for beginners to improve their interest in learning the theory of constitutive theory. (3) Finally, a three-dimensional image constitutive model of rock and soil is established through experiments, and the program written by MATLAB is compared with the test results of conventional triaxial compression of rock and soil, which fully verifies the correctness and effectiveness of the constitutive model of rock and soil established in this paper.