Coal mining subsidence brings a series of problems such as farmland damage,eco-logical damage,and hidden dangers of land disasters.Conducting investigations and monito-ring of coal mining subsidence areas,identifying subsidence ranges,predicting subsidence boundaries,and monitoring subsidence rates is conducive to timely understanding of subsid-ence types,subsidence mechanisms,and stable subsidence states,providing reference for farmland protection,ecological restoration,and disaster prevention and control work.This article studies the boundary and goaf of a coal mine in northern Anhui province using syn-thetic aperture radar interferometry(InSAR),micro motion exploration measurement data,and ground subsidence fiber optic hole monitoring data in areas similar to the subsidence zone.The results show that with a 10mm boundary,InSAR can quickly delineate the subsid-ence boundary.Through micro motion exploration and actual measurement data,it was found that the shear wave velocity of the coal bearing strata at a depth of 1 000 m is 25～50 m/s lower than that of the normal strata.InSAR results also show that ground subsid-ence has occurred in the area.Analysis and collection of 12 sets of fiber optic hole monitoring data from similar areas,with the 77.7～200 m depth section as the main deformation area,with a compression amount of approximately 163.77mm,and a data frequency of up to mi-nutes,from which this paper concludes that the coupling of multi-source heterogeneous data based on InSAR,micro motion,and fiber optic hole monitoring methods can achieve a three-dimensional investigation and monitoring effect of"from the surface to the inside,and in re-al-time"in coal mining subsidence areas with"high groundwater level,medium thick coal seams,and kilometer deep".The construction of a three-dimensional investigation and moni-toring technology system is feasible.
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