Study on surface subsidence in coal mining by UAV-photogrammetry monitoring technology

Most of the mining surface subsidence in the western mining area has the characteristics of rapid deformation,deep damage and wide spead. How to quickly,accurately and comprehensively monitor the surface subsidence and environmental damage caused by high-intensity large-scale mining in coal mines is a key problem faced by mining enterprises. The UAV photogrammetry technology was adopted to monitor the surface subsidence of the mining area with high intensity mining in western China,and the basic ideas and methods were proposed. Taking Wangjiata coal mine in Ordos,Inner Mongolia as an example,the research on its application was carried out. The accuracy of DEM and subsidence basin established by UAV photogrammetry technology was compared and evaluated. The research results show that the accuracy of DEM obtained by UAV photogrammetry technique is 228 mm,and the accuracy of subsidence basin is 81 mm,which is 64.5% higher than that of DEM. The relative error of subsidence coefficient obtained by inversion is 1.4% compared with that of the leveling results. Abundant remote sensing images of the surface can be speedily acquired by the UAV photogrammetry technique,and the subsidence data and reliable subsidence parameters of the whole basin can obtained,which can provide support for ecological environment monitoring and subsequent ecological restoration and land reclamation in mining areas. The research results of this paper can provide effective means for surface damage monitoring of most of the western coal mining,and have reference value for other similar mining areas.