周边施工影响下运营城市隧道结构安全控制

Security Control of Urban Tunnel Structure in Operation under Influence of Surrounding Construction

为研究符合杭州地质及环境条件的不同结构类型在役城市隧道的结构安全控制指标和量值基准,采用有限元分析方法,建立大直径盾构隧道、矿山法暗挖隧道、箱型现浇隧道的三维模型,分析计算不同隧道类型的受力状态及结构变形能力评估,并在此基础上收集杭州地区典型城市隧道受外部工程影响实测案例、典型城市隧道病害调查与统计分析,基于统计学原理,定义小概率条件下(概率小于1%~5%的事件)相关变形控制界限值,最终给出杭州地区大直径盾构隧道、矿山法暗挖隧道、箱型现浇隧道的相关安全监控指标及参考控制值。

In order to study the structural safety control index and the value standard of urban tunnels in-services with different structural types which are in line with the geological and environmental conditions of Hangzhou,threedimensional models of large-diameter shield tunnel,mined tunnel and box-type cast-in-place tunnel are built by finite element analysis method.The stress state and structural deformation of different tunnels are calculated.The measured cases of typical urban tunnels in Hangzhou affected by external projects,disease investigation and statistical analysis are collected.Based on the principles of statistics,the limit value of correlative deformation control under the condition of small probability(<1%~5%)is defined.Finally,the related safety monitoring indexes and reference control values of large-diameter shield tunnel,mining tunnel and box-type cast-in-place tunnel in Hangzhou area are given.