关键词: 广义非线性强度理论, 砂土, 真三轴, 形状参数

Abstract: The generalized nonlinear strength criterion unifies all kinds of the nonlinear strength criteria about the friction material, so that the criterion can represent the strength characteristic of these materials. The shape parameter α is one of the factor that affect the shape of the failure curve in the generalized nonlinear strength criterion, the research about the parameter α is done as follows: (1) The generalized nonlinear strength criterion is applied to the sand, and then, according to the character of the failure curve in the generalized nonlinear strength criterion in the ?-plane, for judging the failure curve convex, the relation between the least of the parameter α and the failure stress ratio Mf was deduced. (2) By some test results about the sand, the proposed criterion for general stress state was applied to simulate test results; and it was shown that the criterion could reproduce the test data fittingly. And then the linear relation between the two parameters in the criterion was found. So the failure behavior of the sand could be reproduced by the use of triaxial compression condition for practical application.

Key words: generalized nonlinear strength criterion, sand, true triaxial test, shape parameter