Research On Stability Analysis And Control Technology Of Stope Bottom Structure In Broken Orebody

Mineral resources are important pillar of the national economy,even if China's current economic growth slowed down,but the demand of mineral resources is still maintained at a high level.In this background,in addition to ore deposits with high grade and good mining conditions,complicated and difficult to mining such as broken orebody has been put into mining.Because the ore body is broken and self-stability is poor,the preparation and cut engineering in the ore body is very easy to be destroyed under the double action of ground stress and mining disturbance,cause the production suspend,even the stope scrapped and ore can't be shipped,cause waste of resources.Xujiagou copper mine in Lueyang County of Shaanxi province ore body is broken,mined by stage shrinkage caving method,tunnels in stope bottom structure floor heave and slope heave is serious,and affect mine production efficiency.In this paper,the stability and control technology of the bottom structure of the broken ore body is studied by means of engineering geological survey,rock mechanics experiment,theoretical analysis,FLAC3 D numerical simulation and similar physical experiment.The main contents include:The rock mass quality of Xujiagou copper mine is classified and evaluated by engineering geological survey and RMR rock mass classification method.The physical and mechanical parameters of Xujiagou copper mine rock are obtained by rock mechanics experiment,and the expansibility of Xujiagou rock mass is classified.Through theoretical analysis and numerical simulation,the mechanism of the floor heave and slope heave in the bottom structure of Xujiagou copper mine is studied from the aspects of rock mass,ground stress distribution,roadway section shape and supporting conditions,and the technical thinking of control the floor heave and slope heave is put forward.On the basis of optimizing roadway section,by analyzing the problems of the existing support methods and the mechanism of the various supporting methods,the paper puts forward "sparging and anchoring net+full cross-section steel frame+bag filling ring after steel frame" combined support form,the supporting parameters were determined by theoretical calculation and engineering analogy,and the numerical simulation was carried out.