基于光纤应力传感的斜倾厚层山体滑坡预警研究  

Study on Early Warning of Landslide in Inclined Thick Layer Based on Fiber Optic Stress Sensing

作　　者：冯雪莲[1] FENG Xuelian(Department of Railway Signal and Communication,Baotou Railway Vocational and Technical College,Inner Mongolia 014060,China)

机构地区：[1]包头铁道职业技术学院铁道通信信号系,内蒙古包头014060

出　　处：《灾害学》2020年第2期13-17,共5页Journal of Catastrophology

基　　金：内蒙古自治区高等学校科学研究项目(NJZZ17539)。

摘　　要：以往采用仪表观测法预警对山体滑坡现象时,只针对常态山体预警,忽略斜倾厚层山体预警,且需人为处理观测数据导致观测周期长、实时性差。该文基于光纤应力传感的斜倾厚层山体滑坡预警,分析光纤应力传感器原理后,设计斜倾厚层山体滑坡预警系统。求解斜倾厚层山体中各点安全系数,将安全系数较低点作为光纤应力传感器设置点;采用基于光时域反射计的光纤应力传感器将光纤探测信号通过光纤耦合器发送至可调谐光纤滤波器,可调谐光纤滤波器改变光纤探测信号的光栅波长并发送至光电转换器;光电接收器在光纤探测信号的光栅波长与可调谐滤波器投射波长出现重合情况下获取最大光强信号,并将其转化为电信号发送至A/D转换器中采集信号;采集的数字信号发送至现场可编程门阵列中进行运算与处理,并将结果发送至PC显示端;预警模块根据数字信号处理结果在斜倾厚层山体滑坡前进行有效预警。In the past, instrumental observation method was used to warn landslide phenomena, only for normal mountain warning, ignoring inclined thick mountain warning, and the observation period was long and not real-time due to the need to process observation data artificially.Based on the optical fiber stress sensor,an early warning of the slope thick layer landslide.is given.After analyzing the principle of optical fiber stress sensor, the early warning system of inclined thick mountain landslide is designed.To solve the safety factor of each point in inclined thick mountain, the lower safety factor is used as the setting point of the optical fiber stress sensor;the optical fiber stress sensor based on optical time domain reflectometer is used to send the optical fiber detection signal through the optical fiber coupler to the tunable optical fiber filter, which changes the grating wavelength of the optical fiber detection signal and transmits it to the photoelectric converter.When the grating wavelength of the fiber detection signal coincides with the projection wavelength of the tunable filter, the device obtains the maximum intensity signal and transmits it to the A/D converter to collect the signal;the collected digital signal is sent to the field programmable gate array for calculation and processing, and the result is sent to the PC display terminal;the early warning module is based on the results of digital signal processing.Effective early warning should be carried out before inclined thick mountain landslides.The simulation results show that the system can accurately warn the specific location of inclined thick-seated landslides, and the average warning time is only 52.5 Ms.

关 键 词：光纤应力传感 斜倾厚层 山体滑坡 预警研究 光时域反射计 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置] X43[自动化与计算机技术—控制科学与工程]