摘要
双层复合衬砌结构是一种新型隧洞衬砌结构型式,其外衬承受外部水土压力,内衬承受内水压力,体现了“结构联合、功能独立”的新型输水隧洞设计理念,目前该衬砌型式已成功应用到我国北方某输水工程中,如何确定双层复合衬砌隧洞安全预警监控指标是工程运行管理的重点和难点。本文基于以往研究成果,提出了工程结构监控指标及监控阈值确定的统一技术路径;根据双层复合衬砌结构受力特点,开展可能破坏模式分析;基于破坏模式与监测量的敏感性分析,提出层间渗压作为双层复合衬砌隧洞结构核心监控指标,内衬处的钢筋计测值以及外衬处的测缝计测值作为辅助监控指标,为双层复合衬砌隧洞安全运行提供借鉴和参考。
Double composite lining structure is a new type of tunnel lining structure,its outer lining under external water and soil pressure,lining under the internal pressure,embodies the"joint structure,function⁃al independence"a new type of water conveyance tunnel design concept,now the lining pattern has been successfully applied to a water project in the north of China.How do you determine the double-layer com⁃posite lining of tunnel safety early warning monitoring index is the emphasis and difficulty in operation and management project.Based on the previous engineering research results,this paper proposes a unified tech⁃nical path to determine the monitoring index and monitoring threshold of engineering structure.According to the technical path and the characteristics of the double-layer composite lining structure,the failure mode analysis of the tunnel is carried out.Based on the sensitivity analysis of failure mode and monitoring quanti⁃ty,the interlayer seepage pressure is proposed as the core monitoring index of the double-layer composite lining structure.The measured values of steel bar meter in internal lining and seam measurement meter in external lining can be used as auxiliary monitoring indexes,which provides reference for the safe operation of double layer composite lining tunnel.
作者
刘毅
李海枫
商峰
LIU Yi;LI Haifeng;SHAGN Feng(State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin,China Institute of Water Resources and Hydropower Research,Beijing 100038,China;Key Laboratory of Construction and Safety of Hydraulic Engineering of Ministry of Water Resources,China Institute of Water Resources and Hydropower Research,Beijing 100038,China;Department of Structure and materials,China Institute of Water Resources and Hydropower Research,Beijing 100038,China)
出处
《中国水利水电科学研究院学报》
北大核心
2021年第1期74-80,共7页
Journal of China Institute of Water Resources and Hydropower Research
基金
国家重点研发计划项目(2018YFC0406700)
国家自然科学基金项目(51779277)
中国水科院科研专项(SS0145B612017,SS0145B392016)
流域水循环模拟与调控重点实验室资助项目(SKL2020ZY10)。
关键词
双层复合衬砌结构
安全预警
监控指标
破坏模式
double layer composite lining tunnel
safety warning
monitoring index
failure mode
