基于分布式光传感技术的变电站地质基础沉降监测

Substation Geological Foundation Settlement Monitoring Based on Distributed Optical Sensing Technology

针对广东珠三角地区部分变电站存在地质基础沉降需要监测的问题,提出了一种基于分布式光传感技术、使用应力光缆的变电站地质基础沉降监测方法。该方法的技术原理是布里渊光时域分析(Brillouin optical time domain analysis,BOTDA)技术,监测硬件系统的构成包括光路系统和电路系统,应力光缆选择定点式应变感测光缆,布线方案包括变电站地表敷设和桩孔光缆入地。模拟试验表明,BOTDA技术能够适应变电站地质基础沉降监测的需要,布设应力光缆的同时要布设温度参考光纤或光缆,做好温度补偿。研究结果证明了该方案的可行性,为变电站防治地质基础沉降灾害提供了一种辅助决策和效果评估手段。

To solve the problem of monitoring geological foundation settlement in some substations in the Pearl River Delta of Guangdong, this paper presents a kind of monitoring method for substation geological foundation settlement by using stress optical cables on the basis of distributed optical sensing technology. The technical principle of this method is Brillouin optical time domain analysis （BOTDA） technology and composition of the hardware system includes the optical system and the electrical system. The stress optical cable is a kind of positioning strain sensing cable and the wiring scheme for stress optical cables includes substation surface laying and pile hole optical cable entering into the ground. The simulation test indicates that BOTDA technology is adaptable to requirements for monitoring geological foundation settlement of the substation, and at the same of laying stress optical cables, it should lay temperature reference optical fibers or cables for temperature compensation. The research results prove feasibility of this scheme, which means it can provide an auxiliary decision-making and effect evaluation mean for preventing geological foundation disasters in the substation.