基坑开挖数值分析中土体硬化模型参数的试验研究  

Experimental study of parameters of hardening soil model for numerical analysis of excavations of foundation pits

作　　者：王卫东[1,2] 王浩然[1,3] 徐中华[2] 

机构地区：[1]同济大学地下建筑与工程系,上海200092 [2]华东建筑设计研究院有限公司地基基础与地下工程设计研究所,上海200002 [3]同济大学岩土及地下工程教育部重点实验室,上海200092

出　　处：《岩土力学》2012年第8期2283-2290,共8页Rock and Soil Mechanics

基　　金：上海市青年科技启明星计划B资助项目(No.11QB1400400)

摘　　要：土体硬化模型已成为基坑数值分析中最常用的本构模型之一,其应用的关键是计算参数的确定。首先采用薄壁取土器现场取得土样,通过基于GDS的三轴固结排水剪切试验、三轴固结排水卸载-再加载试验及标准固结试验获得了上海典型土层土体的三轴试验应力-应变曲线和固结试验荷载-应变关系曲线。然后根据曲线确定了各土层的HS模型参数,建立了各土层HS模型参数中切线模量E oreedf、割线模量E 5r0ef、加载模量E urerf的比例关系,并探讨了这些模量与压缩模量E s1-2之间的比例关系。最后将各层的模型参数与模量间的比例关系与国内外其他软土地区的结果进行了比较。试验结果可作为上海地区及其他软土地区基坑工程数值分析中确定HS模型参数时的参考。The hardening soil model has become one of the most widely used constitutive models in numerical analysis of excavations. The key issue of numerical analysis using hardening soil model is determining parameters of this model. Soil samples of typical soil layers ②2, ③,④and ⑤3） in Shanghai soft deposit is got by using thin wall samplers. The stress-strain curves of soil is got through triaxial consolidated drained test and triaxial loading-unloading-reloading drained test based on GDS and the load-strain curve of soil is got through consolidation test. Parameters of the hardening soil model are determined according to the test results. At the same time, relationships betweenE oreedf, E 5r0ef, E urerfand E s1-2are established. The parameters and these relationships are also compared with those of soils in other districts. The test results can be used as references for numerical analysis of excavations in Shanghai and other soft soil districts.

关 键 词：土体硬化模型 参数 三轴试验 固结试验 GDS三轴仪 薄壁取土器 数值分析 

分 类 号：TU447[建筑科学—岩土工程]