Study on the surface deformation process and mechanism in the mining area by integrating InSAR and numerical simulation
In order to eliminate the potential safety hazard of the mining area and the society caused by the ground subsidence disaster triggered by the continuous mining of the ore body,it is extremely important to carry out effective monitoring of the surface deformation in the mining area and research on the deformation mechanism.Therefore,based on the research background of Dengganshu mine section of Jinsha Mining Industry,the surface deformation monitoring of mining area is carried out using time-series interferometric synthetic aperture radar(InSAR)technology,and a three-dimensional model is established combining with the actual site to simulate the underground excavation process and obtain the distribution law of the displacement,stress and plastic zone of the surrounding rock of the mining area through FLAC3D,so as to comprehensively explore the deformation process and mechanism of the overlying rock and surface under the action of underground mining.The results show that the study area is in the state of non-uniform deformation,and the obvious deformation area is mainly distributed along the highway slope,and its cumulative shape variable fluctuates are in the range of-80～20 mm.Under the influence of mining,the surrounding rock of the goaf is mainly shear failure,and the plastic zone expands gradually with the increase of mining depth.With the advance of mining depth,under the action of its own gravity and mining stress,the magnitude and influence range of concentrated stress increase,and the disturbance influence on the surface is superimposed.At the end of the third mining,the movement range of surrounding rock in the goaf gradually increases and penetrates to the surface,causing surface deformation.The numerical simulation is consistent with the surface subsidence and deformation results shown by InSAR monitoring,which proves the rationality and reliability of the simulation process.The results show that the combination of InSAR monitoring and numerical simulation can directly reflect the formation process and mechanism of surface deformation in the mining area.This method can provide a reference for the monitoring of surface deformation disasters in similar underground mines and the prevention of potential disasters.
surface deformationtime-series InSARnumerical simulationunderground miningdeformation process and mechanism
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