Large Mining Height Of Overlying Strata Movement Regularities And Support Resistance Research

Our country is rich in coal resources, research shows that in a fairly long period of time China’s coal is the main energy in the energy structure will not change. In our proven coal reserves in thick coal reserves occupy1/3of the proportion. In the thick coal seam mining in large mining height fully mechanized coal mining technology is becoming more and more obvious, but also restricts the large mining height fully mechanized coal mining technology development by a lot of factors. In this paper, in order to Shendong mining area with large mining height face field data as the basis, study of large mining height fully mechanized coal mining face length and mining height increased under the condition of mining working face, continuously push forward the process of overlying strata movement and deformation failure regularity of the variation of support working resistance. The main works are as follows:(1) through to Shendong mining area with large mining height working face mine pressure observation results analysis, summarized in the working face length respectively,120.1m,281.4m and343.8m and high4.8m,5.8m under the conditions of the mine pressure behavior, studies of large mining height fully mechanized coal mining with the working face length increases and the deformation of surrounding rock movement in different mining height rule.(2) by using the numerical simulation study of different length of working face and mining height full-mechanized mining full height of overlying strata deformation break and the distribution of the stress field.(3) the key strata theory, study of large mining height of overlying strata in longwall faces the key stratum in the spatial position of key stratum, and the influence of stope support design of other overlying strata structure deformation characteristics.(4) to the greater mining height mining pressure observation, numerical simulation and theoretical research results, in the establishment of large mining height based on the mechanical models of large mining height fully mechanized coal mining, support and surrounding rock relationship, explore the different working face length and height mining stope wall rock control method, studies of large mining height resistance of main influence factors and principle of determining. For the large mining height fully mechanized coal mining stope mining face similar to provide a scientific basis.