Shendong Mining Subsidence Interferometry And Temporal Variation Analysis

Shendong mining utilize large mining height,thin bedrock,rapid excavation technology,belong to high intensity exploration method.Therefore,the wide range land subsidence caused by mining exploitation become one typical geological disasters of Shendong mining.In order to get the large area mining damage situation of Shendong mining,reveal the surface damage rule of high intensity mining.We use the differential synthetic aperture radar interferometry technology(D-InSAR)and short baseline set technology(SBAS-InSAR)which is a new earth observation technology,giving full play to the huge potential of interference technology in the field of surface deformation.Shendong mining as the study area in the paper,using D-InSAR track two plus external DEM “adjacent phase strategy” and “cumulative phase strategy” to get the surface deformation in monitoring period.SBAS technology is used to obtain the time series surface deformation result of Buertai single working face.Finally calculate the every advanced influence angle with field research data.The study analysis conclude that the result of “adjacent phase strategy” relative “cumulative phase strategy” more accurate and reliable.Focused on the surface deformation of Buertai single working face treated by SBAS technology.The main contents and results as follows:(1)using D-InSAR track two plus external DEM “adjacent phase strategy” and “cumulative phase strategy” differential interferometric techniques to obtain Shendong mining surface subsidence situation during January 2012 to June 2013.Through the process of 18 RADARSAT-2 data which covered the area of Buertai.Interpretation on the interferometric phase deformation image,get 17 monitoring periods’ distribution information of Shendong mining subsidence.“adjacent phase strategy” deal with to get 17 results of subsidence area over 20km2,“cumulative phase strategy” process affected by various factors,only get 5 results of subsidence area that present an increasing rule.(2)With SBAS technique by optimizing the baseline of space and time for surface subsidence monitoring of Buertai mining 22201-1/2 working face.By interpreting 47 interferometric phase deformation images get 17 cumulative subsidence distribution,and the change information of subsidence influence area.From 0.668km2 in 20120213 extended to 5.575km2 in 20130607.The speed of new subsidence area is 0.01km2/d.Belong the working face advancing direction amount the distance between the surface displacement point in front of working face and the boundary of working face.Combining with the mining depth data,calculate the advanced influence angle(?)of the individual monitoring time.Under the case of average mining speed of 7.7m/d,the average advanced influence angle is 52.89°.(3)Studies suggest that “adjacent phase strategy” differential interferometric processing can be 17 adjacent periods’ relatively reliable surface deformation information.“cumulative phase strategy” differential interferometric results affected by the time baseline is relatively serious.SBAS technology differential interferometric processing can get long time sequence surface deformation information of mining,can better overcome the effects of time and space baseline.