DInSAR Time Series Analysis Of Shendong Deep Mining Subsidence Law

As one of the most important energy sources in China,coal has brought great economic benefits to the people,but also caused incalculable damage to the local ecological environment.For example,large-scale surface subsidence caused by vegetation damage and uneven deformation caused by ground buildings.Cracking and distortion with other infrastructure.The deep coal mining subsidence has a long-lasting effect and a large range of influence.Therefore,monitoring the deep coal mining subsidence and obtaining the law of surface movement and deformation are very important for disaster prevention and treatment.Based on the multi-period precision level observation of the 113101 first mining face of the Bojianghaizi Mine,multi-temporal DInSAR technology was used to carry out comparative observations on the mining subsidence in the study area,aiming to explore the use of space-to-ground observation technology to assist ground observation.The best technical approach.The main results of this paper are as follows:(1)Realizing the assimilation of star-earth observations,laying the foundation for simultaneous analysis: assimilation of satellite observation time to ground level observation time series,assimilation of satellite observation space coordinates to Gaussian coordinates of ground level observation,and satellite on main section The observed line of sight(LOS)shape is decomposed into sinking and horizontal deformation;(2)Interference processing,data fusion and modeling of 40 Sentinel-1A data are realized: through the DInSAR differential interference processing,the 39-phase interference image is obtained,and the sinking curve of the trend and the main section and the elimination of the outliers are obtained through processing;Based on the satellite observations and the ground results,the fusion data is used to establish a time series Gaussian fitting subsidence curve model,and the slope and curvature of the mining subsidence are further obtained according to the model;(3)Time series analysis of star-ground observation results,partial mining subsidence parameter calculation and residual deformation analysis are realized: the parameters such as the outermost boundary of the subsidence,the lead influence distance,the lead influence angle,the boundary angle and the maximum sink rate are obtained.Using the DInSAR results of extended time series,the residual deformation analysis is discussed,and the adjacent mining influence detection detects the surface deformation caused by the secondary disturbance.(4) A preliminary discussion on the law of deep mining subsidence in the study area was realized: through the analysis of time series DInSAR interference results,Gaussian fitting model and data fusion,the effects of deep and shallow mining subsidence on surface deformation are compared and analyzed,and the surface deformation law of 113101 working surface in the study area is obtained.