Rock strata mining damage monitoring and application based on “space-sky-surface” integrated technology

Mining damage monitoring in mining area is an important basis for studying the law of surface movement and deformation, early warning of mining damage, and damage mitigation design. Due to the special mining geolog- ical conditions in the western China, the cumulative effect of ecological damage and the shortcomings of traditional mining subsidence monitoring technology in observation accuracy, data processing, cost input and monitoring effi- ciency, from the perspective of the whole life cycle of coal mining, the scientific connotation of mining damage is pro- posed and the integrated monitoring technology of “space-sky-surface”is built. Taking the 12401 working face of the Shangwan coal mine in the Shendong mining area as the research background, the BDS + GPS is used for con- trol measurement to provide high-precision spatial three-dimensional coordinates for surface deformation monitoring. Based on the InSAR technology, the temporal and spatial evolution law of surface subsidence and deformation rate is explored. The UAV and field measurement are used to clarify the corresponding relationship between the development law of ground fissures and the advancing speed and weighting step of the working face. The surface subsidence is accu- rately obtained by using fixed station 3D laser scanning. The development trend of deep hidden fractures and the sepa- ration phenomenon of some rock strata are revealed through high-density electrical method and ground penetrating ra- dar. The research results show that there is a phenomenon of surface uplift after mining, and ground fissures are easy to form at the junction of uplift and subsidence. The variation of dynamic fracture width in the middle has the evolution law of “single-peak fracture” and “double-peak fracture”. The fracture width of the front peak is about 1.5 times that of the rear peak, and the interval between the front and rear peaks is about 10 days. Through the multi- source data fusion of the InSAR fine observation area, the GNSS control points and 3D laser scanning results, the sur- face subsidence cloud map and mining damage data information of the working face are obtained, and the period- ic conduction relationship between the periodic weighting of the main roof, the fracture of the main key strata and the main ground fissures is clarified.