黄河冲积粉土地区深基坑变形三维有限元分析  

Three-dimensional finite element analysis of deep foundation pit deformation in alluvial silt area along Yellow River

作　　者：何海英 曹明明 杨伟涛 王刚 袁雄杰 杜子博 张景伟[2] HE Haiying;CAO Mingming;YANG Weitao;WANG Gang;YUAN Xiongjie;DU Zibo;ZHANG Jingwei(China Construction Seventh Engineering Division Co.,Ltd.,Zhengzhou 450004,China;School of Civil Engineering,Zhengzhou University,Zhengzhou 450001,China)

机构地区：[1]中国建筑第七工程局有限公司,郑州450004 [2]郑州大学土木工程学院,郑州450001

出　　处：《建筑结构》2023年第13期152-156,122,共6页Building Structure

基　　金：国家自然科学基金(51908513,U22A20598);河南省重点研发与推广专项(212102310279)。

摘　　要：依托黄河流域冲积粉土地区深基坑工程,采用大型岩土工程有限元软件PLAXIS 3D建立了深基坑三维有限元模型,土体采用硬化土本构模型,分析了基坑开挖对围护结构及周边环境变形的影响,研究了围护桩嵌固深度及地下水位对基坑围护结构变形的影响。结果表明:采用硬化土本构模型能较好地预测黄河流域冲积粉土围护结构的变形和周边沉降;随围护桩嵌固深度增大,基坑围护结构水平位移减小,但减小的幅度也越来越小;考虑降水的基坑围护结构水平位移远小于不考虑降水情况,应做好降水措施,防止围护结构变形过大。Based on engineering of deep foundation pit in alluvial silt area along Yellow River,a three-dimensional finite element model of deep foundation pit was established by using large-scale geotechnical engineering finite element software PLAXIS 3D.The soil body uses hardened soil constitutive model to analyze the influence of foundation pit excavation on the deformation of retaining structure and surrounding environment.The influence of embedding depth of retaining pile and groundwater level on the deformation of foundation pit retaining structure was studied.The results show that the hardened soil constitutive model can better predict the deformation and settlement retaining structure in alluvial silt area along Yellow River small.The horizontal displacement of foundation pit retaining structure decreases with the increase of embedding depth of retaining pile,but the magnitude of reduction decreases more and more small.The horizontal displacement of retaining structure of foundation pit considering precipitation is much smaller than that without considering precipitation.Precipitation measures should be taken to prevent excessive deformation of retaining structure.

关 键 词：黄河冲积粉土地区 深基坑 硬化土本构模型 围护结构变形 围护桩嵌固深度 

分 类 号：TU44[建筑科学—岩土工程]