基坑开挖对壁板桩内力及变形影响分析  

Analysis of Internal Force and Deformation of the Adjacent Barrette Caused by Foundation Pit Excavation

作　　者：孙华圣 赵越新 李佳辉 赵国栋 SUN Huasheng;ZHAO Yuexin;LI Jiahui;ZHAO Guodong(Faculty of Architecture and Civil Engineering,Huaiyin Institute of Technology,Huai’an Jiangsu 223001,China;China Electronics System Engineering No.2 Construction Co.,Ltd.,Yibin Sichuan 644600,China)

机构地区：[1]淮阴工学院建筑工程学院,江苏淮安223001 [2]中国电子系统工程第二建设有限公司,四川宜宾644600

出　　处：《淮阴工学院学报》2023年第5期78-82,共5页Journal of Huaiyin Institute of Technology

基　　金：国家自然科学基金项目(51708245);江苏省自然科学基金项目(BK20160426)。

摘　　要：壁板桩在基础工程中广泛采用。邻近基坑开挖必然会引起壁板桩的变形,严重时会造成桩基破坏,从而对周围建筑物的安全产生严重的影响。探究基坑开挖所导致的邻近壁板桩的变形规律和变形机理,对确保基坑周围建筑物的安全具有十分重要的意义。为了定性及定量确定基坑开挖引起邻近壁板桩内力和变形影响规律,揭示壁板桩变形机理,本文建立基坑-壁板桩-土体相互作用数值模型,从壁板桩内力和变形、周围土体应力分布等方面分析基坑开挖卸荷对壁板桩变形影响规律,揭示壁板桩变形机理,从而为工程实践提供参考。研究结果表明:(1)由于壁板桩的存在,基坑周围土体位移呈非对称分布,壁板桩所在一侧土体水平位移显著小于另一侧位移,但位移影响区域增大。(2)随着基坑开挖深度的增加,壁板桩上附加土压力分布沿着桩长方向从应力增加变成应力释放,拐点位于壁板桩桩顶以下桩长的1/5处。Barrettes are widely used in foundation engineering.The excavation of adjacent foundation pits will inevitably cause deformation of barrettes,and in severe cases,it will cause pile foundation dam⁃age,which will have a serious impact on the safety of surrounding buildings.Therefore,it is of great theoretical and practical significance to effectively and reasonably explore the deformation of adjacent barrettes caused by foundation pit excavation,and understand and master the deformation laws and de⁃formation mechanisms of barrettes to ensure the safety of buildings around the foundation pit.In order to qualitatively and quantitatively determine the influence of excavation on the internal force and defor⁃mation of adjacent barrettes,reveal the deformation mechanism of barrettes,a numerical model of the in⁃teraction between foundation pit,barrettes and soil is established to analyze the influence of stress re⁃lief on the deformation of barrettes from aspects such as internal force and deformation of barrettes,and stress distribution of surrounding soil,and reveal the deformation mechanism of barrettes,thus pro⁃viding reference for engineering practice.The research results indicate that:(1)due to the presence of barrettes,the displacement of the soil around the foundation pit is asymmetric,and the horizontal dis⁃placement of the soil on one side where the barrettes are located is significantly smaller than the dis⁃placement on the other side,but the displacement influence area increases.(2)As the excavation depth of the foundation pit increases,the distribution of additional soil pressure on the barrettes chang⁃es from stress increase to stress release along the pile length direction.The inflection point is located at 1/5 of the pile length below the top of the barrettes.

关 键 词：基坑开挖 壁板桩 土体应力 相互作用 数值模拟 

分 类 号：O319.56[理学—一般力学与力学基础]