Design Of Pipeline Deformation Monitoring Scheme For South-to-North Water Diversion Project In Mining Disturbance Area

With the continuous development of China's energy resources and the continuous construction of infrastructure,there is a conflict between the coal mine disturbed basin and the surface construction(structure)of the mining area.Research on the instability mechanism,damage form and protection measures of buildings(structures)in subsidence areas has emerged.The deformation monitoring of the construction(structure)of the mining area and the acquisition of deformation information are the basis for the above research analysis and verification.In this paper,the deformation analysis and monitoring plan design for the east line of the South-to-North Water Transfer Project in the affected area of the 5302 working face mining in the Baodian Mine of the Yankuang Mine is carried out.From the pipeline deformation monitoring method,the study of the deformation law of the pipe soil to the final integration of the data to form a complete monitoring plan,the following results have been achieved.:(1)Research on the three types of monitoring methods for displacement monitoring,strain monitoring and damage monitoring of pipelines.The pipeline displacement monitoring is selected by traditional surveying and mapping means;for the strain monitoring method,the distributed optical fiber monitoring method is selected to study the optical fiber sensing principle;for the pipeline damage monitoring,the acoustic emission monitoring system is compared with other pipeline damage monitoring methods.It is applicable to the monitoring of buried pipeline damage in the disturbance zone of this paper.(2)Conducted the calculation calculation of the 5302 working face mining subsidence.Collect 5302 working surface engineering overview,natural geographical environment data and geological mining conditions information,and divide the 5302 working face into three stages of “under-exploitation”,“full mining” and “full mining”in the mining process,using probability integration method.For the theoretical basis,the MSPS software is used to calculate the surface subsidence of each stage of the working surface.The distribution of the surface subsidence range and the horizontal movement value(two directions)is represented by the contour line;the surface subsidence value and the horizontal movement value(both directions)at each stage of the pipeline location are calculated;the boundary angle is used to predict the boundary by the probability integral method.Make corrections.Among them,the calculation result of surface subsidence deformation value of pipeline locationprovides boundary conditions for subsequent pipe soil numerical simulation,which provides basis for pipeline and surface displacement deformation monitoring scheme design.(3)The numerical simulation study of the pipeline affected by the 5302 working face mining was carried out.Taking the above-mentioned three stages of subsidence prediction as the model construction idea,the finite element analysis software ABAQUS is selected to construct the geometric model of the soil model,the construction of the constitutive model,the analysis setting,the application of load and boundary conditions,the division and calculation of the model grid.The three-way displacement simulation results of pipeline extraction and analysis are used as the basis for subsequent pipe and soil displacement monitoring.The distribution of axial stress values of pipelines is analyzed as the design basis for subsequent pipeline damage monitoring scheme.(4)Integrate the aforementioned research results and actual project objectives,design pipeline and surface displacement monitoring programs,pipeline strain monitoring programs and damage monitoring programs.Through the design of monitoring line length selection,line position selection,measuring point density and point selection,monitoring sign design,monitoring system layout,monitoring project design and monitoring time schedule,the design of each monitoring program was completed.The research results of this paper provide the basis for the implementation of the pipeline deformation monitoring program in the Baodian section of the East Route of the South-to-North Water Transfer Project.