黄土基坑倾斜组合桩受力及变形数值分析  

Numerical Analysis of Force and Deformation of Inclined Composite Pile in Loess Foundation Pit

作　　者：肖涵楠 曹卫平[1,2] 赵敏 罗龙平[1] 席茂阳 XIAO Hannan;CAO Weiping;ZHAO Min;LUO Longping;XI Maoyang(School of Civil Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China;Key Lab.of Geotechnical and Underground Space Engineering,Xi’an 710055,China;College of Architecture and Civil Engineering,Xi’an Technological University,Xi’an 710021,China)

机构地区：[1]西安建筑科技大学土木工程学院,西安710055 [2]陕西省岩土与地下空间工程重点实验室,西安710055 [3]西安工业大学建筑工程学院,西安710021

出　　处：《武汉理工大学学报（交通科学与工程版）》2024年第6期1199-1204,共6页Journal of Wuhan University of Technology（Transportation Science & Engineering）

基　　金：陕西省自然科学基础研究计划一般面上项目(2024JC-YBMS-299)。

摘　　要：文中采用PLAXIS 3D有限元软件建立内外斜桩、双排直桩以及前直后斜双排桩组合支护结构黄土基坑模型,研究了各支护结构在开挖中桩身受力及变形变化规律,分析对比了降雨对基坑稳定性影响.结果表明:相同条件下,倾斜组合桩控制坑外沉降、桩身受力及变形强于双排直桩;单排桩中内外斜组合受力及变形性能均优于双排桩组合;双排桩中前直后斜双排桩的受力变形特性均优于双排直桩;降雨对黄土基坑有较大影响,各支护结构基坑安全系数降低范围为0.18~0.30,双排直桩基坑安全系数最低,内外斜组合最优,前直后斜双排桩次之.The loess foundation pit model of combined supporting structure of internal and external inclined piles,double-row straight piles and front straight and rear inclined double-row piles was established by PLAXIS 3D finite element software.The variation law of pile stress and deformation of each supporting structure during excavation was studied,and the influence of rainfall on the stability of foundation pit was analyzed and compared.The results show that under the same conditions,the inclined composite pile is better than the double-row straight pile in controlling the settlement outside the pit,the stress and deformation of the pile.The stress and deformation performance of the combination of internal and external inclination in single-row piles are better than that of double-row piles.The mechanical deformation characteristics of double-row piles with straight front and inclined back are better than those of double-row piles.Rainfall has a great influence on loess foundation pit,and the safety factor of foundation pit of each supporting structure decreases from 0.18 to 0.30.The safety factor of double-row straight pile foundation pit is the lowest,the combination of internal and external inclination is the best,and the double-row straight pile is the second.

关 键 词：倾斜组合支护桩 黄土基坑 数值分析 基坑开挖 降雨 

分 类 号：TU473[建筑科学—结构工程]