Comprehensive Technology Research Research On Settlement Monitoring And Engineering Control Of Complex Group Mined Out Area

Chinese mining resources are abundant,and large underground mines exist in all parts of the country.In recent years,Chinese rapid economic development,the demand for mineral resources has gradually increased,but China’s mining technology is backward,there is no deep awareness of the formation of mining goaf governance,so many mines in our country are large or super large goaf existence.Due to the existence of these goafs,the surface above the mining areas in China has been damaged in a large scale,such as soil erosion,arable land destruction,building instability,excessive ground pressure under mining and so on.For the subsidence of these mined-out areas,understand the stability of these mined-out areas,and at the same time put forward a reasonable control program or utilization program to prevent surface subsidence and the protection of the underlying mineral resources has become an important issue of mining in China at this stage,for the future mining of mineral resources,goaf management and other parties.The surface plays an important guiding role.According to the storage conditions of tin pit lead-zinc ore body and the actual situation of goaf,based on three-dimensional laser detection technology,PSInsar technology to detect and monitor the surface and underground situation of goaf,the results of comprehensive analysis.The main achievements include the following aspects:1.Using PS-InSAR technology to process Sentinel-1 data of 21 scenes covering lead-zinc mine of Pingnan tin foundation pit in Guangxi,the distribution cloud map of surface subsidence,contour profile and settlement rate curve of observation points are drawn.Compared with traditional methods,PS-InSAR technology greatly improves the visualization,integrity and predictability of surface subsidence research.2.The monitoring results obtained by PS-InSAR technology are verified by numerical simulation technology.The results show that the goaf subsidence area obtained by PS-InSAR technology is basically consistent with the weak area obtained by numerical simulation calculation.The goaf subsidence data obtained by PS-InSAR technology can be used to control surface subsidence and sum up the subsidence law.Support is provided for goaf management.3.According to the numerical simulation and settlement monitoring results,compared with the actual situation in the field,the treatment scheme of complex goaf was designed.The numerical simulation proves that the scheme greatly reduces the stress of the whole goaf,helps to maintain the stability of the goaf,and greatly reduces the risk of mining the lower orebody.