摘要
HSS(小应变硬化)模型能够反映土体在小应变范围内模量的高度非线性,在软土地区基坑开挖模拟中得到广泛应用.本文对宁波地区典型地层的HSS模型参数进行了试验测定,通过固结试验确定参考切线模量1-sinφ’;三轴剪切试验确定参考割线模量1-sinφ’、有效内摩擦角φ’、黏聚力c’、破坏比Rf和参考加卸载模量1-sinφ’;GDS弯曲元试验测定参考初始模量1-sinφ’,再间接计算得到参考应变γ.在此基础上,系统分析了各土层的模型参数与模量间的比例关系,并将其与国内其他地区的结果进行了比较.试验结果可为宁波地区基坑开挖工程数值分析中HSS模型参数的选取提供参考.
In soft soil area, HS-Small model has strong applicability, mainly because it can better consider the behavior of shear modulus of soil with strain attenuation in the range of small strain. In this paper, the parameters of HS-Small model of undisturbed soft soil in different soil layers in Ningbo are measured. The reference tangent modulus 1-sinφ’ is determined by consolidation test. The reference secant modulus 1-sinφ’, effective internal friction angle φ’, cohesion c’, failure ratio Rf and reference loading and unloading modulus 1-sinφ’ are determined by triaxial shear test. The reference initial modulus 1-sinφ’ is determined by GDS bending element test, and then the shear strain γcan be obtained. On this basis, the proportional relationship between model parameters and modulus of each soil layer is systematically analyzed, and compared with the results of other regions in China. The test results can provide a reference for determining the parameters of HS-Small model in the numerical analysis of foundation pit excavation in Ningbo.
作者
叶俊能
刘干斌
骆睿栋
高游
陆幸
YE Junneng;LIU Ganbin;LUO Ruidong;GAO You;LU Xing(Ningbo Rail Transit Group Co.,Ltd.,Ningbo 315010,China;Institution of Geotechnical Engineering,Ningbo University,Ningbo 315211,China)
出处
《宁波大学学报（理工版）》
CAS
2022年第5期72-78,共7页
Journal of Ningbo University：Natural Science and Engineering Edition
基金
国家自然科学基金(52008214)
宁波市科技计划公益项目(202002N3116)。
关键词
宁波软土
HSS模型
参数间比例关系
数值模拟
Ningbo soft soil
HS-Small model
proportional relationship between parameters
numerical simulation
