比奥固结全耦合模型参数灵敏度分析  

Sensitivity analysis of parameters on Biot's consolidation full coupled model

作　　者：陈卓 骆祖江[1] 

机构地区：[1]河海大学地球科学与工程学院,江苏南京211100

出　　处：《南昌大学学报（工科版）》2017年第4期354-360,379,共8页Journal of Nanchang University(Engineering & Technology)

基　　金：江苏省地质矿产勘查局重点科研资助项目(dk2012ky01)

摘　　要：为了准确研究比奥固结全耦合数值模型中水力学参数和土力学参数对地面沉降的影响程度,针对南通兴益大厦深基坑场地,以比奥固结理论为基础,引入黏性土流变理论,将模型中应力应变关系推广到黏弹塑性,同时考虑了土体相关参数随应力应变状态的动态变化,建立了地下水开采与土体变形的三维全耦合数值模型。在此基础上,选取相关水力学参数和土力学参数,进行局部灵敏度分析和Morris法全局灵敏度分析。结果表明:土体的弹性模量、黏聚力和重度对地面沉降的影响最大,此外,土体的内摩擦角和泊松比也分别对地面沉降有较大影响。In order to study hydrological and mechanical parameters features on land subsidence of groundwater numerical model,a three-dimensional full coupling mathematic model was established and applied to the study of land subsidence on Nantong Xingyi building in Jiangsu Province.This model based on the Biot＇s consolidation theory and combined with the rheological theory of cohesive soil,the constitutive relation in Biot＇s consolidation theory was extended to viscoelastic plasticity,and the relationship between dynamic changes of hydrological parameters and mechanical parameters with the stress and strain state was also considered.Related parameters were chosen here to analysis sensitivity coefficient on both local and global scale in the model.The results indicated that,in the influence factors of land subsidence,the influence of the elastic modulus、cohesion and the weight of soil were the largest,their parameter sensitivity was higher,meanwhile,the internal friction angle and Poisson＇s ratio of soil also had great influence on the land subsidence.

关 键 词：比奥固结理论 地面沉降 数值模拟 灵敏度分析 

分 类 号：TU478[建筑科学—结构工程]