The Monitoring And Inverse Of Large Scale Deformation Of Mining Subsidence

InSAR is a new type of space-to-earth observation technology, which utilizes the SARphase information to obtain accurate topographic and deformation information. With theunique advantages of monitoring tiny surface deformation with its day-and-night, all-weather,broad-covering and high degree of automation monitoring ground deformation capacity,InSAR technique has become a wonderful tool to monitor geological disaster.Exploitation of mining resources brings huge economic benefits to the society, while italso causes various geological disasters. Through the entirety period dynamic monitoring ofmining subsidence, mining subsidence and deformation law can be developed, dynamicevolution process can be mastered, which can provide a scientific basis for the safety miningand comprehensive management of subsidence area.Compare to traditional geodesy technology and GPS, InSAR technology can achievegood monitoring results of slow small scale ground surface deformation in the mining area.But the particularity of mining subsidence can lead to serious time and space de-correlationby using conventional InSAR technique, meanwhile, the DEM accuracy in mountain area isoften low, hence it is hard have an entirety monitoring results of large scale subsidence in themining area by using conventional InSAR technology. For the troubles in monitoring largescale subsidence in mining area by utilizing traditional InSAR technology, as well as themonitoring mine earthquake disaster, this paper carry out a series of experimental analysis,and obtain the following results:1.To determine the position and extent of mining area using pseudo coherence, theconsistency of experimental results and the field investigation data prove the feasibility andthe accuracy of this kind of technology, which provide technical support for the follow-upsurvey and research of the mining subsidence.2. For the troubles in monitoring large scale subsidence in mining area by utilizingtraditional InSAR technology, this paper carry out experiment and research on key technologyand algorithm:①Iterative registration by using offset tracking method can improve registration accuracy of de-correlation area caused by small extent but large scale subsidence;②Multiple window iterative adaptive filtering technology can maintain the large scaledeformation, get rid of the noise and improve the quality of monitoring results of deformation;③Baseline refinement method based on fitting and eliminating baseline residual error caneffectively improve the precision of baseline of ALOS images of mining area with specialgeographic environment, and improve the quality and accuracy of monitoring results.3.The actual monitoring results of mining subsidence show that the SBAS technologyincorporating the key technology and algorithm can obtain the complete monitoring results ofthe mining subsidence, the results is consistent with the field investigation data and the actualmining industry figure data. According to the analysis of InSAR monitoring result, thetemporal and spatial evolution law of surface displacement and deformation in miningworking area can be obtained: the slow deformation, severe deformation, slow deformation,steady state.4.For the first time, combining the high precision and accuracy data in basin edge of themining subsidence monitored by the modified InSAR technology and the mining subsidenceprediction model of probability integral method. The complete curve of the principal sectionsof ground movement basin of study area can be obtained, meanwhile, the maximumsubsidence value and the main coal mining geological factors can be calculated.5. Processing intensity information of the image using the offset tracking method ofInSAR technology can avoid the problems during processing the phase information of thedata, and also can calculate the maximum subsidence value caused mining subsidence. Moreimportantly, the results are highly consistent with the actual mining data.6.The time series monitoring deformation can be obtained utilizing the modified InSARtechnology. Handling the actual mining data as constraint condition, inversing the mineearthquake deformation using the model established by geodesy inversion theory, themagnitude and the precision epicenter of the mine earthquake can be determined.