Study On The Rule Of Ground Deformation And Movement Caused By Underground Mining In Complex Terrain

After decades of mining in Tieshannan Coal Mine in Sichuan,compressed coal “under water,railways and buildings” has gradually become the main resources with good occurrence.In order to ensure the sustainable development of enterprises,it is particularly urgent to disclose those compressed coals in the west wing of the mine.However,the project area is located in the anticline axis,the footwall of F8 fault,near which there are there are many secondary structures.Besides,the surface buildings around are dense and diversified,some of which are sensitive to surface deformation.Those make it difficult to mine under such conditions.Thus,a complete set of rock movement parameters suitable for this mine is particularly important.Based on the analysis of the topographic and geomorphologic characteristics of the project area,the present paper proposes a semi-automatic monitoring network layout based on GPS dynamic monitoring system to obtain the law of surface movement in mountainous area.The deformation monitoring method which combines highly precise GPS dynamic monitoring technology based on different technology and conventional monitoring technology improves the observation efficiency of rock movement in well mining under complex topographic conditions,realizes dynamic prediction and early warning when monitoring and ensures the safe mining.Through the analysis of monitoring data,the surface movement under the condition of mining in complex terrain follows such rules: changes among the measuring points of surface subsidence are discontinuous and nonlinear;subsidence step appears during mining;when mining in reverse slope,measuring points move horizontally away from the working surface for a certain time before moving towards the goaf.Rock movement prediction,numerical simulation and dynamic monitoring are combined together and corrected mutually to obtain the predicted parameters of surface subsidence and the angular parameters of surface movement under complex topographic conditions,which has distinct technica l characteristics.This parameter has been applied to the mining design of other working surfaces and the smooth mining has been achieved at present.The research results enrich the content of Mining Subsidence and provide scientific basis for mining under various buildings(structures)and under similar geological and mining conditions,which has important theoretical and practical significance.Figure 36;Table 15;Reference 64...