摘要
以杭州市地铁隧道群上方某基坑开挖为背景,利用ABAQUS有限元软件三维建模,分析了基坑开挖过程中抗拔桩长度对隧道隆起的影响.结果表明:当抗拔桩桩长40 m时,隧道群的最大隆起变形均<10 mm,从经济上考虑,可取抗拔桩长度为40 m,当抗拔桩达到一定长度后,隧道隆起位移将不再随抗拔桩长度的增加而减小;抗拔桩越长则同一开挖分析步下隧道最大隆起位移越小,且结构底板的及时施作对抑制隧道隆起效果明显;基坑开挖会导致隧道纵向50 m范围内产生隆起,且该隆起范围几乎不受抗拔桩长度的影响.
Based on ABAQUS finite element software,a three-dimensional model of the impact of pit excavation on existing tunnel group of Hangzhou was established to study the impact of tunnel uplift under different pile lengths in the process of foundation pit excavation.The results showed that the maximum uplift deformation of the tunnel group was less than 10 mm,and when the uplift pile reached40 m,the length of the pile could be 40 m,from the economic consideration.The displacement of the tunnel would not decrease with the increase of the length of the pile when the uplift pile reached a certain length.The longer the uplift pile,the smaller the maximum uplift displacement of the tunnel under the same excavation analysis.The excavation of the foundation pit would lead to the uplift of a longitudinal50 m range of the tunnel,and would not be affected by the length of the pile.
作者
丁海滨
郭生根
徐力
徐长节
赵秀绍
Ding Hai-bin;Guo Sheng-gen;Xu Li;Xu Chang-jie;Zhao Xiu-shao(Jiangxi Key Laboratory of Infrastructure Safety Control in Geotechnical Engineering,East China Jiaotong University,Nanchang 330013,China;Jiangxi Harbor and Navigation Administration,Nanchang 330000,China;Research Center of Coastal and Urban Geotechnical Engineering,Zhejiang University,Hangzhou 310058,China)
出处
《兰州大学学报（自然科学版）》
CAS
CSCD
北大核心
2018年第4期529-533,共5页
Journal of Lanzhou University(Natural Sciences)
基金
国家重点基础研究发展计划(973计划)(2015CB057801)
国家自然科学基金项目(51238009,51338009,51668018)
江西省岩土工程基础设施安全与控制重点实验室项目(20161BCD40010).
关键词
基坑开挖
数值模拟
抗拔桩
隆起
地铁隧道群
excavation of foundation pit
numerical simulation
uplift pile
apophysis
metro tunnel
