三峡大学学报（自然科学版）2025，Vol.47Issue(3)：81-88,8.DOI:10.13393/j.cnki.issn.1672-948X.2025.03.012
低净空下地铁车站深基坑施工对高架桥桩变形影响研究
Study on the Influence of Deep Foundation Pit Construction of Subway Station on Viaduct Pile Deformation under Low Clearance
摘要
Abstract
In view of the deep foundation pit project of the viaduct of the existing rail transit line 2 under the Cailian Road station of Suzhou Rail Transit Line 8,the numerical simulation study of the deep foundation pit construction of the subway station under the low clearance of the existing viaduct was carried out,and the rationality of the numerical simulation method was verified by comparing it with the measured results.Based on the numerical results,the effect factors such as enclosure structure,support system parameters,and isolation pile setting on the deformation of bridge piles and deformation control measures were studied.The results show that the deformation of the bridge piles adjacent to the foundation pit can be controlled by optimizing the parameters of the enclosure structure and the support system.The influence degree is as follows:the thickness of the enclosure structure>the material of the enclosure structure(elastic modulus)>the pre-applied axial force of the steel support.When the thickness of the enclosure foundation pit structure is 1.1 times of the original design,the elastic modulus is 35GPa(C30 concrete),and the pre-applied axial force of the steel support is over 65%of full scale,the deformation of the bridge pile can be effectively controlled.The structural parameters of the isolated pile are the key factors to control the deformation of the viaduct pile,and the degree of influence is:the distance between the isolated pile and the pier abutment>the depth of the isolated pile>the material of the isolated pile>the thickness of the isolated pile.The bored pile should be preferentially selected as the isolation pile under low clearance conditions,which should be set at a distance of 4.5 m from the existing viaduct pier.The isolation pile depth is recommended to take 1.4 times of the pit excavation depth,and the thickness is set to 0.55 m.关键词
低净空/地铁深基坑/围护结构/隔离桩/桥桩变形Key words
low clearance/deep foundation pit of subway/enclosure structure/isolation pile/deformation of the bridge piles分类
土木建筑引用本文复制引用
袁国发,施液峰,张婷,杨平,袁华崧,黎兴望,魏领先..低净空下地铁车站深基坑施工对高架桥桩变形影响研究[J].三峡大学学报（自然科学版）,2025,47(3):81-88,8.基金项目
国家自然科学基金项目(51709088) （51709088）
