宁波地区主要土层邓肯—张模型参数试验研究

Study on parameters of Duncan-Chang model for the main soil in Ningbo area

土的本构模型是反映其应力—应变关系的数学表达式,邓肯—张模型作为土的最为普及的本构模型之一,概念简单,计算方便,能较好地反映土体的非线性性态。虽存在很多局限性,仍在实际工程中广泛使用。为了获得宁波地区主要土层的邓肯—张模型参数,从宁波轨道交通地铁1号线一期石路头停车场工点取土样,对各层土样分别在不同的围压下进行了三轴固结排水试验,通过分析其应力应变曲线,得到了所需参数。所得参数可作为宁波地区岩土工程和地下工程问题分析计算的参考值。

The soil constitutive model is a mathematical expression to reflect soil＇s stress-strain relationship. Duncan-Chang model as one of the most popular constitutive models, is clear in concept, convenient in calculation, and it could reflect the soil＇ s non-linear behavior better. Although there are many limitations, it is still widely used in practice. In order to obtain the parameters of Duncan-Chang model for the main soil in Ningbo area, triaxial tests are carried out on the samples obtained from the typical soils to determine all the parameters by analyzing the characteristics of stress-strain curves. The parameters obtained could be a reference for the geotechnical projects in Ningbo area .