基于光纤传感系统的公路隧道地下空洞探测方法研究

Research on detection method of underground cavity in highway tunnel based on optical fiber sensing system

针对现有地下空洞探测技术无法做到全时全域探测的不足,利用光纤传感技术在交通公路隧道内构建分布式振动探测网络,模拟不同情形的地下空洞,对受地下空洞影响而产生的振动信号进行采集和分析,并针对性地设计地下空洞监测判断方法。经过测试统计能够有效识别地质环境中存在的中空坑洞,定位偏差≤±5m,能够及时监测地下空洞存在的异常情况,为公路隧道在运营过程中的安全管理提供有效的参考依据。

In view of the shortage of the existing underground cavity detection technology to achieve full time and global detection,optical fiber sensing technology is used to build a distributed vibration detection network in traffic highway tunnels,simulate underground cavities in different situations,collect and analyze vibration signals caused by underground cavities,and design a targeted underground cavity monitoring and judgment method.Through testing and statistics,hollow pits in geological environment can be effectively identified,positioning deviation≤±5m,and abnormal conditions in underground caverns can be timely monitored,providing an effective reference for the safety management of highway tunnels in the operation process.