Abstract:In response to the problem of controlling the stability of the perimeter rock along the air-retained roadway in the lower coal seams of the close group of coal seams, taking the open channel along the 201 working face of the 0213 working face of the Huangbaizi coal mine as the engineering background, the theoretical analysis, numerical simulation and industrial validation methods were used to analyze the structural characteristics of the overlying rocks along the open channel of the near coal seam, to obtain the minimum resistance required for the support body along the open channel, and to simulate the distribution characteristics of stress and plasticity zones of perimeter rock under the situation of the coal pillars with or without the coal columns left behind from the overlying mine airspace area. The simulation analyzed the distribution characteristics of the surrounding rock stress and plastic zone in the case of overlying coal pillars with or without overburdened mine openings. The research results show that: ① the roadside support body mainly bear the roadside support body outside the exposed rock layer, the upper and lower coal seam collapse zone rock self-weight, the roadside need to provide support resistance can not be less than 75254kN. ② obtained two cases of the roadside support body width technical parameters, from the eye of the opening 0-260m along the open space to stay along the road, the choice of 12m width of the roadside support, from the eye of the opening 260-1250m along the empty space to stay, the choice of 10m width, the choice of 10m width, the choice of 10m width, the choice of 10m width, the choice of 10m width, the choice of 10m width. Along the empty lane from 0-260m from the open cutting eye, 12m width roadside support body is selected, and 260-1250m from the open cutting eye, 10m width roadside support body is selected, which can meet the support demand. ③Propose the method and parameter of perimeter rock stability control along the empty stay lane, and carry out industrial verification of the proposed program, the entire service period of the lane did not occur during the phenomenon of roofing, collapsing gangs, anchor rods and cables support failure, etc., the effect of the lane perimeter rock control is good, the amount of deformation of the perimeter rock has always been less than 250mm, to ensure that the working face of the safe and efficient mining, the program has certain practical significance for solving the problem of perimeter rock stability control of the stay lane along the empty stay lane in the conditions of the same kind of project. This program has certain practical significance for solving the problem of stability control of perimeter rock in similar projects.
