软土邓肯模型的探讨

采用普通三轴进行邓肯模型试验与常规强度试验在方法上一致,但参数求取的含义在本质上不同。三轴试验的某些特点在模型双曲线拟合中会形成较大的随机误差,它们对软上的模型参数可能危害更大。本文以实例分析了产生这类误差的原因,建议最佳双曲线的拟合标准与方法,并在此基础上,进一步讨论了如何提高软土邓肯模型参数求取的合理性。

QUESTIONS ABOUT DUNCAN MODEL OF SOFT SOILS

There is essential difference in the parameter's calculation between Duncan model androutine stress test of soil,although the same method of triaxial test is used to both.Somestochastic errors in the triaxial test may be enlarged in the course of fitting hyperboliccurve and cause harmfulness,especially to soft soil's parameters.A criterion and a betterway to fit the optimum hyperbolic curve are given after analysis of origins of these erro-rs,and the improvement on the rationality of Duncan model's parameters is discussed inthe paper.