厦门地区典型地层HS-small模型小应变参数敏感性分析  

Xiamen Area Typical Stratum of HS-small Model for Small Strain Parameters Sensitivity Analysis

作　　者：施有志[1,2] 阮建凑[1] 吴昌兴[1] SHI You-zhi Ruan Jian-cou WU Chang-xing(School of Civil Engineering and Architecture, Xiamen University of Technology1 , Xiamen 361024,P. R. China Shanghai Jiaotong University, School of Naval Architecture, Ocean ＆ Civil Engineering2 , Shanghai 200240, P. R. China)

机构地区：[1]厦门理工学院土木工程与建筑学院,厦门361024 [2]上海交通大学船舶海洋与建筑工程学院,上海200240

出　　处：《科学技术与工程》2017年第2期100-105,共6页Science Technology and Engineering

基　　金：福建省自然科学基金(2016J01271);福建省住房和城乡建设厅科学技术项目(2016-K-26)资助

摘　　要：小应变硬化模型(HS-small模型)是以HS模型为基础提出的一种能反应土体小应变特性的本构模型,除了包含HS模型参数外,还包含两个小应变参数和,可以反映土体在小应变状态下呈现高度的非线性、高模量等特性。为了研究小应变参数对深基坑数值分析结果的敏感性,针对厦门地区典型土层,采用HS-small模型,通过有限元模拟某深基坑工程的施工过程,开展小应变参数对地表沉降及围护墙弯矩的敏感度分析,并研究参数随基坑开挖的演化规律。结果表明:在厦门地区在深基坑数值分析中,取值对地表沉降和围护墙弯矩值的影响较大,的取值影响相对小;粉质黏土和残积砂质黏性土的小应变参数对结果起到重要的影响;前期开挖,粉质黏土起控制作用,后期开挖,残积砂质黏性土起控制作用。Hardening strain of small model（ HS-small model） is proposed to be capable of reflecting constitutive model of small strain characteristics for soil based on HS model. In addition to including HS model parameters,it also contains two small strain parameters,and and can reflect highly nonlinear,high modulus characteristics of soil at small strain status. To study small strain parameters sensitivity to excavation numerical analysis result,aiming at Xiamen area typical soil layer and using HS-small model,by using finite element simulating a certain excavation project＇s construction process,small strain parameters sensitivity analysis to surface subsidence and enclosure wall＇s moment is carried out. Meanwhile,the evolution of parameters is studied with the excavation. The results show that in excavation numerical analysis of Xiamen area,the value of impacts more on surface subsidence and enclosure wall＇s moment,while the value of impacts less; small strain parameters of silty clay and residual sandy sticky soil have a great influence on the results; during the pre-excavation,silty clay plays the role of controlling; during the post-excavation,residual sandy sticky soil plays the role of controlling.

关 键 词：小应变硬化模型(HSS) 小应变参数 敏感性分析 深基坑 数值分析 

分 类 号：TU476[建筑科学—结构工程]