摘要
为准确预测基坑开挖引起的下卧地铁盾构隧道的变形,首先统计了近期国内发生的73例基坑上跨既有地铁盾构隧道工程案例,归纳总结了这类工程的特点,然后分析了隧道最大隆起变形与各影响因素间的关系,并基于此提出了不同地层中下卧地铁盾构隧道最大隆起变形的预测模型,最后将其与前人提出的预测模型进行了对比分析。结果表明:在基坑上跨地铁盾构隧道工程中,不同地层下卧隧道最大隆起变形与基坑开挖深度、基坑开挖面积、基坑形状因子、基坑上跨隧道长度和卸荷率均呈现正相关关系,但仅通过单个指标来预测下卧隧道最大隆起变形会造成较大偏差;基于工程案例实测数据,给出了一个新的下卧地铁盾构隧道最大隆起变形的预测模型;经对比验证可知,所提出的模型在保证足够精度的前提下,考虑了更多的影响因素,具有较好的适用性。
In order to accurately predict the deformation of the underlying subway shield tunnel caused by foundation pit excavation,73 cases of foundation pit crossing the existing subway shield tunnel project in China were firstly counted,and the characteristics of such projects were summarized.Then,the relationship between the maximum uplift deformation of the tunnel and the influencing factors was analyzed.Based on this,the prediction model of the maximum uplift deformation of the underlying subway shield tunnel in different strata was proposed.Finally,it was compared with the prediction model proposed by the predecessors.The results show that the maximum uplift deformation of the underlying tunnel in different strata is positively correlated with the excavation depth of the foundation pit,the excavation area of the foundation pit,the shape factor of the foundation pit,the length of the tunnel above the foundation pit and the unloading rate in the project of the foundation pit crossing the subway shield tunnel.However,it will cause a large deviation to predict the maximum uplift deformation of the underlying tunnel only by a single index.Based on the measured data of the engineering case,a new prediction model for the maximum uplift deformation of the underlying subway shield tunnel is given.Through comparison and verification,it can be seen that the proposed model has good applicability and considers more influencing factors under the premise of ensuring sufficient accuracy.
作者
蔺云宏
郝云龙
李明宇
田帅
常瑞成
刘新新
LIN Yunhong;HAO Yunlong;LI Mingyu;TIAN Shuai;CHANG Ruicheng;LIU Xinxin(Guangzhou Metro Design and Research Institute Co.Ltd.,Guangzhou 510010,China;College of Civil Engineering,Zhengzhou University,Zhengzhou 450001,China;Xuzhou Metro Group Co.Ltd.,Xuzhou 221004,Jiangsu China)
出处
《河南科学》
2025年第3期337-346,共10页
Henan Science
基金
泰山产业领军人才工程项目(tscx202306015)
河南省重点研发专项(231111322100)。
关键词
基坑开挖
地铁盾构隧道
隆起变形
统计分析
预测模型
foundation pit excavation
subway shield tunne
uplift deformation
statistical analysis
prediction model
