| The ore deposit of Anhui Taiping Mining Company belongs to the typical skarn type copper-iron deposit.The skarn type is usually the direct roof and floor of the ore body,with low strength,easy to collapse,fragmentation and expansion when met with water.The rock stability is very poor,and the roadway support is difficult.With the gradual depletion of shallow resources,Taiping Mining has entered a state of mid-deep mining,and roadway support is more difficult.It is urgent to carry out systematic research to recognize the characteristic mechanism of roadway deformation and failure,establish a scientific and reasonable roadway support system,and improve the roadway.The pertinence and effectiveness of the support ensure the safe and efficient production and mining of Taiping Mining.Aiming at the support problem of skarn-type soft rock roadway in Anhui Taiping Mining,considering the complex geological conditions of the mine site,construction disturbance and other factors,using theoretical analysis,on-site monitoring and numerical simulation,etc.,the deformation and failure of the roadway surrounding rock were carried out.Research work on characteristics,failure zone testing,skarn rock mass mechanical parameter inversion,and bolt support parameter optimization.The main research contents of this paper are as follows:(1)To collect and summarize geological data in mining areas.The basic data of typical ore and rock engineering geology,roadway surrounding rock,ground pressure appearance and support status were collected to analyze and summarize the alteration degree of roadway surrounding rock and its spatial alteration and variation law.The physical and mechanical properties of skarn in Taiping mining area of Anhui province are summarized based on the research work of the research group.According to the existing geological data,the threedimensional geo-mechanical model of Taiping mining area in Anhui Province including faults is established.(2)Explore the temporal and spatial evolution of ground pressure in Taiping Mining480 horizontal skarn roadway.Taking Anhui Taiping Mining-480 horizontal main transportation roadway as the research object,the multi-point displacement meter and bolt dynamometer are used to monitor the surrounding rock displacement and bolt axial force of the roadway.Combined with the method of mathematical statistical analysis,the-480 main roadway is studied.The evolution law of the surrounding rock deformation and load of the transportation roadway in time and space,analyze the progressive deformation process and mechanism of the surrounding rock of the roadway in the underground production environment,and provide a basis for the roadway support.(3)Carry out skarn roadway damage zone range test.The geological radar is used to detect the damaged area of the surrounding rock of the roadway,and the antenna with the center frequency of the geological radar is selected to be 400MHz to test the boundary of the damaged area of the surrounding rock of the roadway.Through multiple measurements of the same section of the roadway and the comparison of the measurement results of different parts of the side siding,combined with the understanding and experience of mechanics,the reliability of the geological radar in detecting the thickness of the surrounding rock failure area is verified.Test the range of the roadway surrounding rock failure area at different measurement points and analyze the distribution characteristics of the roadway surrounding rock failure area.(4)Optimize the bolt support parameters of skarn roadway.According to the existing geological data,analyze the original roadway support situation.According to the test results of the failure zone,skarns with large spatial differences in mechanical properties are classified,and the length of the bolts is optimized according to the classification results.Use FLAC3D software to establish a three-dimensional numerical model of roadway support in line with the mining area,an inverse analysis method of rock mass mechanical parameters based on displacement-failure zone is established.Based on the actual monitoring displacement value of the skarn roadway and the range of the test failure zone,the rock Sensitivity analysis of the mechanical parameters of the body,the determination of the mechanical parameters of the rock mass to be inverted,the optimal iterative calculation of the displacement-failure zone back analysis using the golden section method,and the exploration of the mechanical parameters of the skarn rock mass.Use the existing bolt support parameters as a reference to analyze the soft rock roadway anchor of Taiping Mining.The pole support parameters are optimized,and then the support plan suitable for the skarn roadway at the Anhui Taiping Mining site is determined. |
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