摘要
以杭州某地下连接通道及河道基坑工程为背景,通过设计、施工、数值模拟、监控量测综合分析大面积卸载对下方地铁隧道的影响。研究分析表明,上跨地铁基坑施工并不是单纯引起地铁隧道的隆起变形,场地回填平整、桩基施工、土体加固等也会引起下方地铁的沉降变形,基坑工况越复杂,地铁变形越复杂。因此在上跨地铁基坑设计施工中要因地制宜,尽可能简化施工工序,在基坑施工中应尽量控制地铁上方整体加载量及卸载量达到平衡,在基坑开挖时应沿垂直于地铁方向进行抽条开挖,减小基坑暴露时间并加强监测与反馈应急机制,这些措施可以有效地降低基坑开挖对下方地铁的影响,可供今后类似工程参考。
Based on the project of an underground connecting channel and a river foundation pits in Hangzhou,this paper comprehensively analyzes the influence of large area unloading on the underground subway tunnel through design,construction,numerical simulation and monitoring measurement.The results show that the construction of the foundation pit across the existing subway does not simply cause the uplift deformation of the subway tunnel,the settlement deformation will also be caused by the site backfilling,pile foundation construction and soil reinforcement.The more complex the foundation pit condition is,the more complex the subway deformation will be.The author suggests that the design and construction of the foundation pit across the subway should be based on local conditions,and the construction process should be simplified as far as possible.In the construction of the foundation pit,the overall loading and unloading quantity above the subway should be controlled to achieve balance as far as possible.The excavation of foundation pit should be carried out along the direction perpendicular to the subway,the pit exposure time should be reduced,monitoring and feedback emergency mechanism should be strengthened.These measures can effectively reduce the influence of foundation pit excavation on the underground subway tunnel,and can be used as reference for similar projects in the future.
作者
沈扬
朱建才
陈春红
金小荣
莫立成
Shen Yang;Zhu Jian-cai;Chen Chun-hong;Jin Xiao-rong;Mo Li-cheng
出处
《建筑技术开发》
2024年第2期52-56,共5页
Building Technology Development
关键词
基坑开挖
荷载平衡
变形控制
时空效应
数值分析
excavation of foundation pit
load balance
deformation control
time-space effect
numerical analysis
