土体硬化模型参数试验研究及其在南昌地区基坑工程的应用

基坑开挖数值分析的关键在于土体本构的选择和计算参数的合理选取，硬化模型（HS模型）是应用较为广泛的模型之一。通过采用GDS空心扭剪试验仪（SS-HCA）和常规固结仪完成大量室内试验，获取了南昌地区软土层的硬化模型参数，对各层土参数中模量之间的比例关系进行探讨，并将试验得到的结果与相关文献的结果进行比较和总结。运用PLAXIS有限元数值计算软件，对南昌某地下室深基坑工程进行数值模拟，土体本构模型采用程序内置的HS模型。结果表明，围护桩深层水平位移的实测数据与数值计算结果基本吻合，表明获取的HS模型参数及方法适用于南昌地区基坑开挖的数值分析。

Experimental study on parameters of hardening soil model for soils and its application in foundation pit engineering in Nanchang

The significance of numerical analysis of foundation pit excavation lies in the selection of soil constitution and reasonable input parameters.The hardening model(HS model) is one of the soil constitutive models that are widely used.In this paper, the GDS Hollow Torsion Shear Tester (SS-HCA) and consolidation apparatus were used to complete a series of laboratory tests.The parameters of the hardening model of the soft soil layer in Nanchang were obtained through the tests. The proportional relationship between the modulus of each layer of soil parameters has been discussed.The experimental results were compared with the result from literatures. Then, the PLAXIS finite element software was used to conduct numerical simulation of a certain basement deep foundation pit project in Nanchang. The soil constitutive model adopted the programmed HS model. The results show that the calculated value of the deep horizontal displacement of the retaining pile is basically consistent with the measured value. The HS model and the determination method for parameters have been proved to be applicable in numerical analysis of foundation pit excavation engineering in Nanchang area.