Application Research Of Distributed Optical Fiber Monitoring Based On BOTDA In Slope Engineering

Strengthening the monitoring of slope engineering is of great significance for timely and accurate evaluation of its stability and the formulation of economically rational,safe and reliable reinforcement and treatment programs.Based on the Qujing East Ring Expressway project,this paper carried out the application research of distributed optical fiber technology based on BOTDA in slope engineering.The specific research results are as follows:(1)The finite difference software was used to numerically simulate the five-stage slope reinforced by bolt frame beam.The plastic zone,slope surface and deep displacement,anchor axial force and maximum of the slope under various support were calculated.The distribution of shear strain increments.The relationship between the shear failure zone of the slope,the maximum displacement in the horizontal direction,the axial force of the slope anchor and the safety factor of the slope and the state of the slope support are obtained.The numerical simulation conclusion also provides the development of the distributed optical fiber monitoring scheme.Reference.(2)Using BOTDA-based distributed optical fiber sensing technology,a monitoring plan for high-slope surface and deep deformation was developed,and the embedding and construction techniques of the slope surface and deep displacement monitoring were introduced respectively,which passed the four-month period.Monitoring data collection and analysis,timely grasping the stability of the slope,and providing reference construction experience for BOTDA monitoring technology in other similar monitoring projects on the slope surface and deep deformation.(3)A distributed optical fiber automated online monitoring system based on BOTDA is designed,which facilitates the recording,extraction and analysis of monitoring data,especially in generating data charts.The platform is used to efficiently process the massive data of slope monitoring,and further realize the intelligentization and informationization of the distributed optical fiber monitoring technology based on BOTDA in the actual monitoring project.The above research results provide a reference for the application of distributed optical fiber technology in slope monitoring,and have certain engineering application value.