| Dynamic pressure roadway should be affected by the adjacent stope roof strata breaking,rotary sinking and contacting waste stability in the process of dynamic change,the deformation of surrounding rock is intense, difficult maintenance,Espe-cially in the face of the advance support pressure and the influence area of the dynamic pressure lag segment needs to strengthen the support.In this paper, taking Fu Chun mine as the background,based on the theory of limit equilibrium, FLAC3D numerical simulation and field pressure monitoring,mainly to obtain the following conclusions:(1) According to the principle of limit equilibrium, the edge stress of coal around the dynamic pressure roadway is analyzed, and the reasonable width of narrow coal pillar is 3.85-4.75m.Based on the FLAC3D simulation, the stress and displacement of the narrow coal pillar were calculated under the width of the coal pillars being 3m, 3.5m,4m, 4.5m, 5m a total of 5 schemes,and the reasonable size of narrow coal pillar is 4m.(2) Through the simulation analysis of monitoring data of mine pressure on the numerical,The range of violent influence of dynamic pressure of 3upper411 transportation roadway by adjacent working face is -40m?+80m,the peak value of stress being the maximum value of 19.25MPa, and the stress concentration factor is 2.5 at the place behind the adjacent working face by 20m.(3)According to the influence degree of dynamic pressure of adjacent working face,finally, the dynamic segment surrounding rock control scheme is developed and adopted. In the severe dynamic pressure influence section of 3upper411 transportation roadway, adjustment of support density reasonably, and reinforce the narrow coal pillar by the extended anchor + anchor beam at the same time.(4) The field monitoring shows that the solid coal mining section is supported by anchor net and cable beam, and the cable is made of three kinds of parallel staggered arrangement; The section of dynamic pressure in severe impact increase the density of support, using five parallel fancy layout on basis of solid coal excavation section,at the same time, the lengthened bolt and anchor beam are used to reinforce the narrow coal pillar;in the gob side entry driving section,the influenced by the dynamic pressure is small,in order to speed up the driving speed,The support scheme is adjusted to anchor net spray support, effectively control the surrounding rock dynamic pressure roadway deformation, but also provides a basis for pressure control of roadway surrounding rock under similar conditions. |
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