邓肯-张模型参数中K与n值的计算方法研究

Study of calculation method for values k and n in Duncan-Chang model parameters

邓肯-张非线性模型是应用最广泛的土的应力-应变本构模型,但在实际应用中发现:按照试验规范进行数据处理时,得到的参数K,n值不合理。通过对3种土料的固结排水剪(CD)试验数据的处理,对K,n值按规范方法和适线法进行取值的2种取值方法进行了分析比较,发现运用适线法得到的K,n值更合理,并总结了适线法的选点方法。

Duncan-Chang non-linear model is the widely-used earth stress-strain constitutive model, however, it is found in application that the obtained values k and n are not rational in the processing of data according to test specifications. Through processing of the consolidated drained shear test data of 3 types of soils and comparison of values k and n by the standard method and curve-fitting line method, it is found that the values k and n obtained by the method of curve-fitting line are more rational. The paper sums up the point selection method by curve-fitting line method.