基于斜桩支护的框架结构基坑变形分析  

Deformation analysis of frame structure foundation pit based on inclined pile support

作　　者：张福海 周玉石 刘学港 秦承帅 孙子正 张一鸣 ZHANG Fuhai;ZHOU Yushi;LIU Xuegang;QIN Chengshuai;SUN Zizheng;ZHANG Yiming(School of Civil and Transportation Engineering,Hebei University of Technology,Tianjin 300401,China;Shanghai Chengdi Geotechnical Design Co.,Ltd.,Shanghai 201800,China;School of Qilu Transportation Engineering,Shandong University,Jinan 250061,Shandong,China)

机构地区：[1]河北工业大学土木与交通学院,天津300401 [2]上海城地岩土设计有限公司,上海201800 [3]山东大学齐鲁交通学院,山东济南250061

出　　处：《山东大学学报（工学版）》2022年第1期58-65,共8页Journal of Shandong University（Engineering Science）

基　　金：国家自然科学基金资助项目(51809069,51709258);中国博士后基金特别资助项目(2020T130377);山东省博士后基金创新资助项目(202001012)。

摘　　要：基于数值分析方法与修正剑桥模型理论,针对土-斜桩-框架桩体系共同作用下基坑变形问题,运用有限元软件ABAQUS模拟斜桩竖向沉降、地下连续墙水平侧移、地表竖向沉降、框架桩水平侧移的受力变形情况。在基坑施工过程中,当斜桩布置较为密集时,上部框架桩结构易受斜桩近距离作用,甚至存在因操作不规范导致的局部搭接,产生较长时间内共同作用,引起较大桩侧变形甚至结构沉降。通过数值分析工具,对多工况参数如斜桩夹角、框架桩尺寸、框架桩与斜桩间距进行参数敏感性分析,获得了结构的力学响应特征及长期变形规律。Aiming at the deformation of foundation pit under the joint action of soil-inclined pile-frame pile system,based on the nu-merical analysis method and modified Cambridge model theory,the finite element software ABAQUS was used to simulate the stress and deformation of inclined pile vertical settlement,diaphragm wall horizontal lateral displacement,surface vertical settlement and frame pile horizontal lateral displacement.In the process of foundation pit construction,when the arrangement of inclined piles was dense,the upper frame-pile structure was vulnerable to the close-distance action of inclined piles,and even there was local overlap caused by irregular operation,which produced a long-term joint action and caused excessive pile side deformation and even structural settlement.Through numerical analysis tools,the sensitivity analysis of parameters such as the angle between inclined piles,the size of frame piles and the distance between frame piles and inclined piles were carried out,and the mechanical response characteristics and long-term deformation laws of the structure were obtained.

关 键 词：基坑支护 斜桩结构 桩土作用 修正剑桥模型 数值分析 

分 类 号：TU443[建筑科学—岩土工程]