Identification of structure and parameters of rheological constitutive model for rocks using differential evolution algorithm

来源期刊:中南大学学报(英文版)2008年增刊第1期

论文作者:苏国韶 张小飞 陈光强 符兴义

文章页码:25 - 28

Key words:rheological constitutive model; rocks; differential evolution algorithm; identification; FLAC3D

Abstract: To determine structure and parameters of a rheological constitutive model for rocks, a new method based on differential evolution (DE) algorithm combined with FLAC3D (a numerical code for geotechnical engineering) was proposed for identification of the global optimum coupled of model structure and its parameters. At first, stochastic coupled mode was initialized, the difference in displacement between the numerical value and in-situ measurements was regarded as fitness value to evaluate quality of the coupled mode. Then the coupled-mode was updated continually using DE rule until the optimal parameters were found. Thus, coupled-mode was identified adaptively during back analysis process. The results of applications to Jinping tunnels in China show that the method is feasible and efficient for identifying the coupled-mode of constitutive structure and its parameters. The method overcomes the limitation of the traditional method and improves significantly precision and speed of displacement back analysis process.

基金信息:the National Natural Science Foundation of China

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