Study On Rock Movement Characteriscs And Monitoring Technology Induced By Mining Goaf

With the development of ore body mining,the gradually formed empty areas in the underground,the increase of the number of underground empty areas and the increase of the exposed area of roof in empty areas,study the induced rock movements in the open areas of the mines.Features and monitoring techniques are of great significance to mine production and safety.This paper takes a metal mine as the engineering research background: It discusses the relationship between rock movement and surface subsidence during the mining process,theoretically analyzes the stability of the goaf,numerically simulates the stress and rock movement characteristics after mining,and monitors the subsidence induced by mining on site.Deformation to study the laws of rock-movement subsidence induced in the empty areas of the mine,and provide technical support for the safe and efficient mining of underground mines.1.Mechanistic analysis of the formation mechanism of the overlying rock formations in the void area,orebody form the empty area after mining overlying strata movement and surface subsidence influenced by mining location,time of extraction,extraction rate,the deformation by the cavity roof strata movement will gradually transfer to the surface on the surface of the earth.2.Mechanic analysis method is used to establish the mechanical model of roof rock stratum in vacant area,taking into account the failure mechanism of roof deformation under the condition of horizontal ground stress,and the ultimate span of damage is obtained.3.Through numerical simulation calculation and analysis,the characteristics of rock movement induced by the goaf under the condition of gravity stress mainly show that the displacement in the vertical direction changes greatly,and the vertical displacement is much larger than the horizontal displacement;the goaf is under the condition of tectonic stress.The induced displacement of the rock movement in the vertical direction is smaller than the vertical displacement under self-gravity stress conditions,and the horizontal displacement changes significantly under tectonic stress conditions.4.Through the GPS on-line monitoring system to monitor the subsidence displacement of the ore body after mining,according to the monitoring data analysis,we know that the subsidence is the largest monitoring point GPS2 subsidence is-24 mm,the largest increase in the monitoring point is GPS5 Its rise displacement is 18 mm.