Zhao Gu 16 Coal Seam Roof Cutting An Unloading Along The Empty Left Lane Technology Research

Due to the henan jiaozuo coal group, the mining area every year, by pillar a large amount of waste of coal resources, thus carried along the empty left lane engineering can reduce or even avoid the waste of coal resources. This article mainly by the henan jiaozuo coal group Zhao Gu the engineering background of a mine 16011 face, aimed at the working face under the cut along the groove of the top pressure relief for the project, emphatically analyzed for pre-splitting cutting seam in the process of design, and has designed the numerical simulation carried out to verify the pre-splitting kerf width. Combined with the data of the PU monitoring system, the actual engineering effect of the design scheme was analyzed. This paper analyzes the above problems in terms of theoretical analysis, numerical simulation and engineering practice, and concludes the following main conclusions:(1) the traditional roadway is achieved through the use of wooden ricks, dense support on the roadway, and the filling of the rock and concrete. These are not easy, costly, and the protection lanes are not very effective. Avoiding the above disadvantages by using the tip unloading pressure along the empty lane.(2) build under the traditional model of longwall mining along the empty left lane, and cut the top pressure, the mechanical model for the theoretical calculation, it is concluded that cut the top pressure relief along the empty left lane in Zhao Gu mine 16011 working face is feasible in theory, and compared that cut the top pressure relief for the bearing pressure is less than conventional longwall mining mode of abutment pressure along the empty left lane, supporting small cost, high safety and reliability.(3) which is based on the practical mine pressure, through the mechanical analysis and numerical simulation of the pre-splitting cutting seam roof reasonable height of 9 m, reasonable Angle is 15 °, reasonable spacing is 600 mm. This design can bring down the overlying strata of the 16011 working area, but it does not affect the stability of the surrounding rock in the open chute.(4) For Zhao Gu 16011 a mine geological conditions, the left lane segment on the basis of the original form of support for the danger division, and the reinforcing supporting design, combined with cutting the top pressure relief for technical means to achieve.(5) Through the data feedback analysis of the PU monitoring system, the pressure on the side face of the slot is lower, and the working face cycle is larger than the other. Roadway at the top of the original stress gradually shift to adjacent working face, the left lane section of the roadway in stress zone, the guarantee of the roadway surrounding rock stability, the deformation of roadway is mainly characterized by roof subsidence, subsidence appears in the biggest cut mouth, reinforcing supporting should be carried out here.