城市隧道开挖对地表建筑群的影响分析及其对策  

Influence due to urban tunnel excavation on ground buildings and its countermeasures

作　　者：张顶立[1] 李鹏飞[1] 侯艳娟[1] 房倩[1] 

机构地区：[1]北京交通大学隧道及地下工程教育部工程研究中心,北京100044

出　　处：《岩土工程学报》2010年第2期296-302,共7页Chinese Journal of Geotechnical Engineering

基　　金：国家重点基础研究发展计划(973)项目(2010Cb732100);北京市科技计划重点资助项目(D08050603130804)

摘　　要：城市浅埋暗挖隧道施工不可避免地扰动地层,造成地表建筑物沉降、倾斜、甚至产生裂缝,影响建筑物的安全和正常使用。分析建筑物的变形特点及其变化规律对减小城市隧道施工造成的环境影响具有重要意义。结合厦门机场路隧道下穿地表复杂建筑群的工程实践,采用现场实测统计分析、数值模拟和理论分析方法,揭示隧道施工影响下地表建筑物的变形规律、变形破坏模式,提出以差异沉降和裂缝开展为主的建筑物变形控制标准和"预警、报警及极限"的三级管理办法,建立建筑物开裂和沉降之间的关系;数值模拟预测分析浅埋大跨隧道开挖对关系工程成败的#34房屋的施工影响,优化施工方法和支护参数,提出相应的控制措施。研究结果可为机场路隧道后续施工和其他类似城市隧道、地铁等穿越工程提供一定的借鉴和参考。With the rapid development of urban tunnel construction,increasing attention has been paid to urban environment safety due to urban tunnel excavation in recent years because no matter what kind of construction method is adopted,it will influence environment inevitably and bring safety risks.It is inevitable to harass the stratum during the construction of urban shallow tunnels,incurring the subsidence,sloping and even crack of buildings on the ground,which will influence the safety and the routine use of buildings.Therefore,it is significant to analyze the deformation character and movement mechanism of buildings to minimize the impact on existing structures induced by tunnel construction.Based on the practice of Xiamen Airport Road Tunnel going through complex building blocks under the ground,by using in-situ measured data,numerical simulation and theoretical analysis method,the deformation mechanism of ground buildings and its failure modes are then expounded;and subsequently the control standard involving differential subsidence and crack space of buildings and the three-class management method of ＂early warning,warning and utmost warning＂ for building deformation are proposed,and the relationship between building crack space and differential subsidence is presented.By numerical simulation,the deformation of #34 house,a key to the success of this project due to shallow and large span tunnel construction,is predicted,and then the excavation method and support parameters are optimized.Finally,some countermeasures are put forward.The research results can provide references to the future construction of Xiamen Airport Road Tunnel and other similar projects such as urban tunnels and subway tunnels passing through existing structures.

关 键 词：城市隧道工程 建筑物变形 变形监测 开裂 数值模拟 

分 类 号：TU47[建筑科学—结构工程]