School of Civil Engineering, Sun Yat-sen University, No. 135 XinGangXiLu, Guangzhou 510275, China.
Guangdong Engineering Research Centre for Major Infrastructure Safety, School of Civil Engineering, Sun Yat-sen University, Guangzhou 510275, China.
Sensors (Basel). 2018 Aug 22;18(9):2763. doi: 10.3390/s18092763.
Monitoring the internal force of the rocks surrounding a mine-shield tunnel for the initial support of a mine-shield tunnel, in complex geological and hydrological environments, requires bolts with specific features such as high tensile strength, low shear strength, good insulation and resistance to corrosion. As such, internal force monitoring has become an important issue in safety monitoring for such tunneling projects. In this paper, the adaptability of a mine-shield tunnel project in a corrosive environment is investigated. A fiberglass reinforced plastic (FRP) bolt with high tensile strength, low shear strength, resistance to fatigue, non-conductivity and resistance to corrosion is used as a probe in tandem with an anchor-head dynamometer to monitor the internal force of the rocks surrounding a mine-shield tunnel for initial support. Additionally, solar energy collection technology is introduced to create a remote monitoring system. Using a 2.5 km long railway tunnel located in the northeast of the Pearl River Delta of China as a case study, the present study shows that, compared with a conventional steel bolt, the FRP bolt has advantages, such as avoidance of the risks associated with the shield machine, insulation and resistance to corrosion. As a probe, the response of the FRP bolt to events such as a blasting vibration and a construction disturbance that results in internal changes in the surrounding rock demonstrates a clear pattern that is appropriate for monitoring the internal force of the rocks surrounding a mine-shield tunnel in a corrosive environment. FRP bolt-based monitoring not only provides new technological support for controlling the risk involved in the initial support of a mine-shield tunnel but can also be widely deployed in projects with special requirements for disassembly, conductivity and corrosion.
在复杂的地质和水文环境下，对矿山护盾隧道初期支护的围岩内力进行监测，需要具有高强度拉伸、低剪切强度、良好的绝缘和耐腐蚀等特殊性能的锚杆。因此，内力监测已成为此类隧道工程安全监测的重要问题。本文研究了腐蚀性环境中矿山护盾隧道工程的适应性。采用高强度拉伸、低剪切强度、耐疲劳、不导电和耐腐蚀的玻璃钢锚杆作为探头，与锚杆测力计串联，监测矿山护盾隧道初期支护的围岩内力。此外，还引入了太阳能收集技术来创建远程监测系统。以中国珠江三角洲东北部的一条 2.5 公里长的铁路隧道为例，本研究表明，与传统的钢锚杆相比，玻璃钢锚杆具有避免盾构机相关风险、绝缘和耐腐蚀等优点。作为探头，玻璃钢锚杆对爆破振动和施工干扰等导致围岩内部变化的事件的响应表现出清晰的模式，适用于监测腐蚀性环境中矿山护盾隧道的围岩内力。基于玻璃钢锚杆的监测不仅为控制矿山护盾隧道初期支护风险提供了新的技术支持，而且还可以广泛应用于对拆卸、导电和腐蚀有特殊要求的项目。
