Dynamic Response Law of Granite and Its Constitutive Model with Cyclic Loading

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Dynamic Response Law of Granite and Its Constitutive Model with Cyclic Loading

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[1]DING Xiaobin,ZHAO Junxing,DONG Yaojun.Dynamic Response Law of Granite and Its Constitutive Model with Cyclic Loading[J].Journal of Zhengzhou University (Engineering Science),2024,45(01):90-97.[doi:10.13705/j.issn.1671-6833.2024.01.003]

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Journal of Zhengzhou University (Engineering Science)[ISSN 1671-6833/CN 41-1339/T] Volume: 45 Number of periods: 2024 01 Page number: 90-97 Column: Public date: 2024-01-19

Title:: Dynamic Response Law of Granite and Its Constitutive Model with Cyclic Loading

Author(s):: DING Xiaobin; ZHAO Junxing; DONG Yaojun; 1. School of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510640, China; 2. South China Institute of Geotechnical Engineering, South China University of Technology, Guangzhou 510640, China

Keywords:: triaxial test; dynamic elastic modulus; dynamic damping ratio; improved Duncan-Chang model

CLC:: -

DOI:: 10.13705/j.issn.1671-6833.2024.01.003

Abstract:: In this paper, the true triaxial testing machine was used to conduct experimental research on granite specimens with size of 100 mm×100 mm×100 mm with cyclic loading, and to explore the dynamic elastic modulus and dynamic damping ratio of granite under different confining pressure, dynamic loading frequency, dynamic stress amplitude, and number of cycle. The changing law of the data was compared and analyzed. The test found that the dynamic elastic modulus of granite increased linearly with the confining pressure, and the dynamic damping ratio decreased linearly with the confining pressure. The growth of dynamic elastic modulus gradually became larger. The dynamic elastic modulus of granite increased exponentially with the dynamic loading frequency, and the dynamic damping ratio increased as a power function with the dynamic loading frequency. At a dynamic load frequency of 20 Hz the internal activity of the rock was more intense, and the frequency had a greater impact on the rock. The dynamic elastic modulus increased as a quadratic function with the dynamic stress amplitude, and the dynamic damping ratio decreased as a power function with the dynamic stress amplitude. The composition of the rock had an influence on the dynamic damping ratio. The improved Duncan-Chang model reflected well the dynamic constitutive relationship of the granite under different actions of the rock. The model obtained in this test could be used as a reference for subsequent inversion of the dynamic properties.

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Last Update: 2024-01-25