Mechanical Performance Test And Optimization Of Mining Scheme For A Mine

In the mining process of underground mine,the rationality of mining scheme has great influence on the stability of surrounding rock,and the choice of mining scheme depends on the characteristics of structural plane,the mechanical properties of rock mass and the distribution of ground stress.In this paper,according to the lack of research data of a mine,the rock mass of the mine is taken as the object of study,the engineering geological structure investigation is carried out,and the distribution characteristics of the main structural plane in the middle section of the mining area are analyzed.The strength and Deformation characteristics and failure rules.The size and distribution of three-dimensional geostresses in the mining area are tested by the acoustic Kaiser effect by acoustic emission test.Based on the previous research results,the FLAC^3D calculation program was used to establish the three-dimensional model.The influence of different mining schemes on the stability of the surrounding rock was studied from the aspects of principal stress characteristics,plastic zone distribution and displacement change.The preliminary mining scheme was optimized for the engineering design of the mine and production safety to provide a theoretical basis.The main contents and conclusions of the study are as follows:?1?The main structural plane of the rock mass in the middle stage of mining is measured and measured by the surveying method.Using the DIPS software to analyze the characteristic data,the favorable structural facies of the middle middle of the mining area are as follows:417middle metamorphic rock 172°?69°,367 middle metamorphic rock 350°?85°,317 Medium metamorphic rock 21°?79°.?2?The experimental results show that the uniaxial compressive strength,tensile strength and elastic modulus of rock are obtained by uniaxial compressive deformation test,indirect tensile test and angle die shear test.Ratio,cohesion and internal friction angle and other physical and mechanical basis parameters.?3?In the middle of the 417 field,four directions were selected to carry out the core,and the acoustic test was carried out.The fractal theory was used to analyze the experimental results.The fractal dimension-time stress relationship of the samples was obtained.The method is used to make a more accurate interpretation of the Kaiser point of acoustic emission.The results show that the maximum and minimum principal stresses of the mine are 19.67MPa and 7.73MPa respectively,and the intermediate principal stress is 11.73MPa.The basic and the current international geostress field has been consistent with the statistical law.?4?The numerical model was established by using FLAC^3D calculation and analysis program,and the structural parameters and mining sequence were studied.Firstly,the stability of the surrounding rock is analyzed from the aspects of the principal stress characteristics,the distribution of the plastic zone and the displacement change.The stability of the surrounding rock is analyzed.Combined with the economic benefit,And the effect of the mining sequence on the stability of the surrounding rock is studied on the basis of the preferred parameters of the stope structure.The comparative analysis of the mining sequence is carried out,Finally,considering the plastic zone distribution,stress size,displacement change,economic efficiency and other factors,when the size of the mine and the pillars were 18m and 7m,respectively,when the mining area was 18m and 7m,respectively,Taking the mining sequence is more conducive to the stability of the surrounding rock and mine production capacity.