杭州典型软土硬化本构模型参数特性  

Parameter Characteristics of the Hardening Constitutive Model of the Typical Soft Soil in Hangzhou

作　　者：邓凌青 DENG Ling-qing(East China Branch of China Railway Construction Group Co.Ltd,Kunshan 215300,Jiangsu Province,China)

机构地区：[1]中铁建设集团有限公司华东分公司,江苏昆山215300

出　　处：《中国农村水利水电》2023年第5期151-156,共6页China Rural Water and Hydropower

基　　金：国家自然科学基金资助项目(51268046);中铁建设集团有限公司科技研发计划项目(2019229-9-009)。

摘　　要：硬化本构模型(HS模型)由于可以更好地模拟软土加、卸载以及剪切与压缩硬化特性在基坑数值模拟中得到应用。以杭州地铁1号线彭埠站以北地块基坑为例,由于该基坑区域广泛分布深厚高灵敏性软土,软土HS模型参数取值对基坑开挖过程稳定性及临近地铁隧道影响分析至关重要。通过常规三轴试验仪、标准固结仪和微型十字板剪切仪等进行了室内土工试验,获得了不同深度下基坑软土硬化模型的c’、φ’、Eoedref、E50ref、Eurref参数以及软土的触变比,探讨了软土的Eoedref、E50ref、Eurref与Es1-2之间比例关系,并与其他地区软土的HS模型参数进行对比分析。试验结果所得土体硬化模型参数可为软土地区基坑工程数值模拟提供参考。Hardening constitutive model(HS model)has been applied to the numerical simulation of the foundation pit because it can better simulate the loading,unloading,shear and compression hardening characteristics of soft soil.As the pit area is widely distributed with deep and highly sensitive soft soils,the value of the soft soil HS model parameters is crucial to the stability of the excavation process and the im⁃pact analysis of the adjacent metro tunnel.The value of HS model parameters of soft soil is very important to the stability of foundation pit ex⁃cavation process and the impact analysis of adjacent metro tunnel.In order to obtain HS model parameters,sensitivity and thixotropic ratio of soft soil,the hardening constitutive model parameters c'、φ'、Eroeefd、Er5e0f、Eruerf of different depth sand thixotropic ratio are obtained by convention⁃al triaxial tester,standard consolidation instrument and miniature vane shearing instrument,and the relationship among parameters Eroeefd、Er5e0f、Eruerf and Es1-2 are studied.The HS model parameters of soft soil in other areas are compared and summarized.The soil hardening model parameters obtained from the test results can provide a reference for deep excavations numerical simulation in similar soft soil areas.

关 键 词：软土 土体硬化模型 参数 触变比 

分 类 号：TU473[建筑科学—结构工程]