Title of Paper:岩石直接拉伸破坏过程及其分形特征的三维数值模拟研究

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Date of Publication:2022-06-30

Journal:岩石力学与工程学报

Affiliation of Author(s):建设工程学部

Issue:7

Page Number:1402-1410

ISSN No.:1000-6915

Abstract:A numerical mode is developed to simulate the completely failure process of rock subjected to direct tension with the aid of the parallel computing. The mechanical properties follow a certain distribution function, including elastic modulus, Poisson ratio and peak tensile strength. When the maximum tensile stress in the element meets its tensile strength, the element loses its bearing capacity and the elastic modulus will be reduced to a small value. Then the numerical model is proved to be efficient compared with the theoretical model, experimental results and other numerical models. Five specimens with different heterogeneities at meso-scopic level are undertaken direct tension test. The complete loading-displacement curves as well as the nonlinear mechanical behaviors are obtained. Numerical tests show that the rock specimens with higher homogeneities at meso-scopic level have the higher tensile strength, the higher initial elastic modulus at macroscopic level and show a more brittle failure and a lower residual strength. The surfaces of the fracture are rougher in the more heterogeneous rock specimens. The results of the fractal of the distribution of the failure elements (AE events) show that fractal dimensions increase with the increase of the tensile stress and will arrive to a certain value when the specimens are fractured totally. The fractal of the failure elements distribution represents the heterogeneity and the brittleness of different rocks.

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