超长引水隧洞安全监测系统组网研究

水工隧洞建设逐渐向长距离、大断面、大埋深方向发展,基于电测法的传统安全监测系统组网方式面临着信号传输衰减,高水头下绝缘保护难度大,工程成本高等难题,因此不再适用于此类隧洞。结合国内某超长引水隧洞安全监测系统的实际施工,通过:1)选用光纤光栅传感器;2)监测断面内传感器采用串联或并联组网;3)监测断面间通过G.652D光纤连接组网;4)各数据采集站通过接入主干公网或GPRS无线传输2种方式进行组网,提出一套完整的超长引水隧洞安全监测系统组网方案,并通过相关实验与实际工程运用,证明该组网方案在保证监测数据长距离可靠传输的同时,减少工程成本,为引水隧洞安全监测工作提供参考。

Research on networking of safety monitoring system for super-long diversion tunnel

The construction of hydraulic tunnels gradually develops towards long distance, large section and deep burial. The traditional safety monitoring system based on electrical measurement method is faced with the problems of signal transmission attenuation, diffificulty of insulation protection under high waterhead and high engineering cost, so it is no longer suitable for this kind of tunnel. In this paper, combined with the actual construction of a domestic superlong diversion tunnel safety monitoring system, through: 1) selecting Fiber Bragg Grating sensors; 2) connecting sensors in monitoring section by series and parallel; 3) connecting monitoring sections through G.652D optical fifiber; 4) connecting data acquisition stations through the main public network or GPRS wireless transmission,it forms a complete network scheme of safety monitoring system for super-long diversion tunnel.Through experiments and practical engineering application, it is proved that the network scheme can not only guarantee the reliable transmission of monitoring data over a long distance, but also reduce the engineering cost. It provides reference for safety monitoring of diversion tunnel.