双层复合衬砌隧洞运行安全预警监控指标研究

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...

Research on operation safety warning and monitoring index of double layer composite lining tunnel

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, functional 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 composite 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 technical 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 quantity, 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.