Research On Surface Mining Subsidence Patterns In Mountainous Areas Based On Synergistic Monitoring Of InSAR And GNSS Technologies

The impact range of surface movement in mountainous areas is generally larger than that in plain areas,which is more likely to cause serious landslides,surface cracks and other deformations,which will expand the impact of coal mining on the surface of mountainous areas and intensify the extent of damage to the surface structure.GNSS technology can provide highprecision location information,but its monitoring points are concentrated on the main section,and the reasonableness of the network structure of the monitoring points will affect the accuracy of the monitoring results.The rapid development of In SAR technology provides new technical means and challenges for the detection of surface deformation in mining areas,and its main means is to use phase information to achieve millimeter-scale detection of surface deformation in mines,but it is limited by the deformation monitoring gradient.To address the above problems,this paper takes the mountainous surface mining subsidence problem at the working face 22618 of Zhenchengdi Mine in Shanxi Province as the research background,and carries out the research on surface subsidence monitoring and law of mining subsidence in mountainous areas through multifaceted methods such as In SAR technology,GNSS technology and cooperative monitoring of In SAR and GNSS data.The main research work and results are as follows:(1)Monitoring surface mining subsidence at the working face of 22618 in Zhenchengdi Mine based on SBAS-In SAR technology.Using SBAS-In SAR technology to process Sentinel-1A data,the influence range of the mountain mining subsidence basin was determined and the subsidence basin was located;the surface domain deformation rate and time-series cumulative deformation variables of the study area were obtained,the surface deformation of the study area was analyzed,and the maximum surface subsidence rate of the subsidence basin-186.67mm/year,the surface subsidence volume maximum 248 mm,center point coordinates(112.065°E,37.892°N),length 1073.27 m,width 521.438 m,etc.;to provide the deformation data of the edge of the subsidence basin of mountain mining for the subsequent data synergy study.(2)Monitoring of mining subsidence on the main section of working face 22618 at Zhenchengdi Mine based on GNSS technology.Using GNSS PPP technology to obtain subsidence data along the strike direction and two tendency observation lines on the main section of the mining face,and using Kalman filtering based on adaptive factors to weaken and reject the influence of noise and interference in the system;study the time,space and distribution law of surface subsidence on the main section line of the subsidence basin;calculate the inversion to obtain the angular volume parameters of the subsidence basin;for the subsequent data co-monitoring The data of surface sedimentation center are provided for the subsequent data cooperative monitoring study.(3)Synergistic monitoring of mining subsidence at working face 22618 of Zhenchengdi Mine based on In SAR and GNSS data.In order to make full use of the respective monitoring advantages of In SAR and GNSS monitoring technologies,In SAR and GNSS data were synergized to invert the three-dimensional complete deformation field data of the ground surface based on the probability integral method for the complete subsidence basin above the working face,and the results showed that the method could reflect both the complete influence of mountainous mining on the surface subsidence near the working face,and compared with the monitoring results of In SAR technology,the data The root mean square error of comonitoring is reduced by 96.8%,and 64.4% compared with the GNSS probability integration method;it can also accurately obtain the surface settlement data in the area with severe deformation of the settlement center,and the accuracy of the root mean square error is improved by 56% compared with the GNSS probability integration model;and on the basis of the threedimensional complete deformation field of the surface,the numerical simulation of the overlying rock and ground stress field,displacement field and The numerical simulation of the damage field is carried out to explore the ground subsidence law under the influence of coal resource mining in mountainous areas.