基坑数值分析中HSS模型参数试验及应用

Experimental and Application of HSS Model Parameters in Foundation Pit Numerical Analysis

小应变土体硬化模型(hardening soil model with small-strain stiffness,HSS)作为一种能够考虑土体小应变阶段非线性特性的高级本构模型,在基坑数值分析中有着特有的优势。通过开展系列三轴试验、标准固结试验及共振柱试验,获得了常州地区典型土体的HSS模型相关参数,建立了模量参数之间的比例关系,并与现有研究成果进行了对比分析。最后借助大型岩土工程有限元分析软件Plaxis 3D,以实际工程为背景进行分析,通过比对模拟结果与监测数值,验证了试验获得模型参数方法的适用性及参数的可靠性。研究结果可为该地区及其他地区的基坑工程分析提供参考。

The HSS model(hardening soil model with small-strain stiffness)has unique advantages in the numerical analysis of foundation pit as an advanced constitutive model,which can consider the non-linear characteristics of the soil in the small-strain region.By conducting a series of triaxial tests,standard consolidation tests and resonant column tests,relevant parameters of the HSS model for typical soils in Changzhou were obtained,and the proportional relationships between the modulus parameters were established and compared with the existing researches.Finally,with the aid of Plaxis 3D,a large-scale geotechnical finite element analysis software,the analysis was carried out in the context of the actual project.By comparing the simulation results with the field data,the applicability of the experimental method in obtaining the model parameters and the reliability of the parameters were verified.The results can be used as a reference for the analysis of foundation pits in this area and other areas.