摘要
单侧邻近地表水体存在偏压的深基坑支护工程受力及变形复杂,设计风险较大。以成都轨道交通某地铁车站深基坑支护工程为背景,采用数值模拟方法,对带撑双排桩支护结构在偏压工况下的受力及变形进行研究,并与传统深基坑计算方法结果进行对比,最后研究排距对该类支护结构的内力及变形影响规律。研究表明,在偏压荷载作用下双排桩会产生初始弯矩及初始位移,桩身最大位移发生在桩顶部。当排距大于某一值时,在计算主体结构支护结构的内力时可以不计偏压超载的不利影响,后排桩仅起到将偏压荷载隔离的作用,偏压荷载不会对前排桩产生附加变形,后排桩自身的变形主要为在水压力作用下压缩了桩后的土体,变形已不受基坑开挖变形的影响。
The supporting engineering of deep foundation pit is complex in force and deformation due to the bias of one side near the surface water,so the design risk is large.A subway station deep foundation pit supporting in chengdu rail transportation project as the background,the numerical simulation method,to take hold of retaining structure with double-row piles under bias conditions to study the stress and deformation,and compared with the conventional calculation method for deep foundation pit results,finally the row spacing of the internal force and deformation of retaining structure are studied.The results show that the initial bending moment and initial displacement of double row piles are generated under the action of bias load,and the maximum displacement of pile body occurs at the top of the pile.When the row spacing is greater than a certain value,when calculating the internal force of retaining structure the main structure to bias the negative impact of the overload back row pile only have the effect of bias load of the isolation,bias load will have additional deformation of the front pile,deformation of back row pile itself mainly in the water pressure after compression pile under the action of soil,the deformation is not influenced by the deformation of foundation pit excavation.
作者
杜志涛
杜林
张冀
DU Zhitao;DU Lin;ZHANG Ji(Guangzhou Metro Design and Research Institute Co.,Ltd.,Guangzhou,Guangdong 510010,China)
出处
《施工技术》
CAS
2020年第S01期48-52,共5页
Construction Technology
关键词
深基坑
双排桩
内支撑
数值模拟
deep foundation excavation
double row piles
inner supports
simulation
作者简介
杜志涛,工程师,国家一级注册结构工程师,E-mail:819043983@qq.com
