膨胀土浸水前后单桩p-y曲线研究  

Research on p-y curve of single pile in expansive soils before and after immersion

作　　者：杨迪 江杰[2,3,4] 侯凯文[2] YANG Di;JIANG Jie;HOU Kaiwen(China Railway Construction Group Southern Engineering Co.,Ltd.,Guangzhou 511400,China;College of Civil Engineering and Architecture,Guangxi University,Nanning 530004,China;Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education,Guangxi University,Nanning 530004,China;Guangxi Key Laboratory of Disaster Prevention and Engineering Safety,Guangxi University,Nanning 530004,China)

机构地区：[1]中铁建设集团南方工程有限公司,广东广州511400 [2]广西大学土木建筑工程学院,广西南宁530004 [3]广西大学工程防灾与结构安全教育部重点试验室,广西南宁530004 [4]广西大学广西防灾减灾与工程安全重点试验室,广西南宁530004

出　　处：《人民长江》2023年第1期170-176,共7页Yangtze River

基　　金：国家自然科学基金项目(52068004);广西自然科学基金项目(2018GXNSFAA050063);广西重点研发计划项目(AB19245018)。

摘　　要：为研究膨胀土地基中水平受荷桩浸水前后的承载性能,分别进行了浸水前后的水平受荷桩室内模型试验,探究了桩周土抗力(p)、桩的水平位移(y)和桩身弯矩的变化规律;分别建立了浸水前后水平受荷桩的p-y曲线计算公式,并通过模型试验验证了所提公式的正确性。研究表明:浸水前后的土抗力随着水平位移的增加而逐渐增大,最终趋于稳定;浸水前后桩身弯矩均是先增大后减小,最大值位置分别为埋深0.10 m(4D)和0.12 m(4.8D)附近,当水平荷载相同时,浸水后的桩身弯矩较浸水前的有所增大。In order to study the bearing performance of horizontally loaded piles in expansive soils before and after immersion,through laboratory model tests,a series of horizontally loaded pile model tests were carried out before and after immersion.The changes law of the soil resistance around the pile,the horizontal displacement and the bending moment of the pile shaft were explored,then the calculation formulas for the p-y curve of the horizontally loaded piles before and after immersion were established respectively,and the correctness of the proposed formula was verified by model experiments.The research result shows that the soil resistance before and after immersion gradually increases with the increase of horizontal displacement and finally tends to stabilize.The bending moment of the pile shaft first increases then decreases with increasing pile depth before and after immersion.The peak position is about at the depth of 0.1 m(4D)and 0.12 m(4.8D)respectively.When the horizontal load is the same,the bending moment of the pile body after immersion is larger than that before immersion.

关 键 词：水平受荷桩 P-Y曲线 膨胀土 桩身弯矩 桩周土抗力 

分 类 号：TU473.1[建筑科学—结构工程]