Numerical verification of similar Cam-clay model based on generalized potential theory
来源期刊:中南大学学报(英文版)2014年第12期
论文作者:ZHONG Zhi-hui(钟志辉) YANG Guang-hua(杨光华) FU Xu-dong(傅旭东) WEN Yong(温勇) 张玉成
文章页码:4707 - 4713
Key words:generalized potential theory; similar Cam-clay model; modified Cam-clay model; numerical test; PFC3D
Abstract: From the mathematical principles, the generalized potential theory can be employed to create constitutive model of geomaterial directly. The similar Cam-clay model, which is created based on the generalized potential theory, has less assumptions, clearer mathematical basis, and better computational accuracy. Theoretically, it is more scientific than the traditional Cam-clay models. The particle flow code PFC3D was used to make numerical tests to verify the rationality and practicality of the similar Cam-clay model. The verification process was as follows: 1) creating the soil sample for numerical test in PFC3D, and then simulating the conventional triaxial compression test, isotropic compression test, and isotropic unloading test by PFC3D; 2) determining the parameters of the similar Cam-clay model from the results of above tests; 3) predicting the sample’s behavior in triaxial tests under different stress paths by the similar Cam-clay model, and comparing the predicting results with predictions by the Cam-clay model and the modified Cam-clay model. The analysis results show that the similar Cam-clay model has relatively high prediction accuracy, as well as good practical value.
ZHONG Zhi-hui(钟志辉)1, YANG Guang-hua(杨光华)1, 2, 3, 4, FU Xu-dong(傅旭东)1, WEN Yong(温勇)1, ZHANG Yu-cheng(张玉成)2, 3, 4
(1. School of Civil and Architectural Engineering, Wuhan University, Wuhan 430072, China;
2. Guangdong Research Institute of Water Resources and Hydropower, Guangzhou 510610, China;
3. Geotechnical Engineering Technology Center of Guangdong Province, Guangzhou 510640, China;
4. Emergency Technology Research Center of Guangdong Province for Public Events, Guangzhou 510640, China)
Abstract:From the mathematical principles, the generalized potential theory can be employed to create constitutive model of geomaterial directly. The similar Cam-clay model, which is created based on the generalized potential theory, has less assumptions, clearer mathematical basis, and better computational accuracy. Theoretically, it is more scientific than the traditional Cam-clay models. The particle flow code PFC3D was used to make numerical tests to verify the rationality and practicality of the similar Cam-clay model. The verification process was as follows: 1) creating the soil sample for numerical test in PFC3D, and then simulating the conventional triaxial compression test, isotropic compression test, and isotropic unloading test by PFC3D; 2) determining the parameters of the similar Cam-clay model from the results of above tests; 3) predicting the sample’s behavior in triaxial tests under different stress paths by the similar Cam-clay model, and comparing the predicting results with predictions by the Cam-clay model and the modified Cam-clay model. The analysis results show that the similar Cam-clay model has relatively high prediction accuracy, as well as good practical value.
Key words:generalized potential theory; similar Cam-clay model; modified Cam-clay model; numerical test; PFC3D