Research On Mining Subsidence Law In Zaoquan Coal Mine Based On D-InSAR

Due to the increasing number of surface subsidence caused by coal mining,strengthening the research on coal mine surface subsidence can lay a good foundation for grasping the surface damage situation,studying the mining subsidence law,and rationally exploiting coal resources.The differential interference radar technology(DIn SAR)is an emerging surface information monitoring technology in recent years,which has the technical advantages of all-weather monitoring,wide coverage and high accuracy compared to conventional measurement technology.This article analyzes the obvious subsidence of a working face,explores the development law of subsidence during the mining of a working face,and analyzes the factors affecting surface subsidence,by using radar satellite image data and D-In SAR technology processing methods to obtain coal mines’ surface subsidence data.The research results lay the ground for further mining,ensuring the safety of mining.The main research work and results of this article are as follows:(1)The best differential interference method and the best radar image data for the study area were selected.On the basis of preprocessing the data,the specific processes and results of the main technical features in D-In SAR such as baseline estimation,interferogram generation,leveling effect,filtering calculation,phase unwrapping,and geocoding were interpreted in the view of principles analysis.(2)By processing and extracting the subsidence data of coal mines’ surface with the help of D-In SAR,the qualitative and quantitative analysis of the subsidence monitoring results was carried out,obtaining the subsidence situation of Zaoquan Coal Mine from January 20,2016 to September 16,2016.Along with typical mining areas chosen to be analyzed,the space-time evolution rules of surface subsidence on the scale of a mining face.The 3D surface subsidence model of time series was finally obtained and constructed,by extracting the surface subsidence value.(3)On the premise of extracting the surface subsidence data by D-In SAR,the inclination,curvature and other parameters,used to measure surface subsidence,along the advancing and inclination directions of a working face were calculated.The starting distance,lag distance,lag angle,subsidence coefficient,etc.calculated,the dynamic development law of surface subsidence of a working face was obtained.(4)By comparing different working faces,the influencing factors in the process of surface subsidence were researched and analyzed.Mining areas,depth-thickness ratio and working face advancing speed mainly selected as variables.And subsidence speed are used as the measurement indicators to study,the influence laws of mining area,depth-thickness ratio and working face advancing speed on mining subsidence were obtained by using measurable indicators such as subsidence value,inclination,curvature and subsidence speed.There are 54 figures,16 tables and 90 references in this paper.