Complex Three-dimensional Modeling And Stability Analysis Of Mined-out Area

The damage of mined-out area which is one of the most important forms of disasters induced by mining project seriously threats mine property and personnel life security. With the mining of the work promoting,it will induce a catastrophic accident when the exposed area of cavity increases to a certain extent. Therefore, it is importantly significant to carry out goaf stability analysis and treatment effect evaluation. In order to analysis goaf stability and evaluate governance effect, the paper is based on the long-term project "Anqing Copper Mine Ground Pressure Monitoring And Control Technology researching", applying theoretical analysis, the scene detecting and monitoring means, and centring on the goaf which uses high stage followed by filling method.The article mainly studies as the following:(1)Through the scene investigation of rock mass structure surface and the measurement of in-situ stress,analyze the fissures and joints of the surrounding rock of the mined-out area, the distribution of stress state, based on this, evaluates the stability of surrounding rock with CSIR and Q system classification method of mined-out area of the mine, it provides further analysis on stability with the basic premise.(2) Adopting the international advanced goaf3D laser detection system C-ALS on Anqing Copper Mine gob area for precision detection, combining with mine modeling software SURPAC to build the goaf three-dimensional entity model, analysing goaf detection of the3D data to get the goaf roof area, volume, coordinates, roof and other information information, and comparing the detection results of the different periods to obtain important information of instability of mined-out area,such as roof fall, pillar collapse etc.(3) Appling of balance arch theory and limit equilibrium theory to build high level with backfilling method goaf mechanical calculation model, calculates stability of the filling pillar of goaf, eventually obtain the relationship between the height of the goaf side exposure and the strength of the filling pillar.(4)Using such as secondary monitoring, rock movement monitoring multiple field research means, monitoring goaf ground pressure and management process, analysis the stability of the mined-out area,this paper reveals goaf ground pressure activity laws in the tectonic stress environment.(5) Establishing FLAC3D numerical model of Anqing copper mine, simulating the stope, analysing the stability of mined-out and evaluating the effect of governance, the paper reveales Anqing copper mine goaf instability mode.