Study Of Temporal And Spatial Effects On Roof Tunnel Arrangement Of Upward Stress Releasing Mining

With the increase of mining depth, the number of Gassy and coal and gas outburst mine are growing, coal and gas outburst coal seam mining difficulty also increases increasingly, so more challenges and higher technical requirements brought to the coal mining work.After a large number of scientific research and practical inspection, the upstream pressure relief mining is proposed and applied. With the under-protecting stratum mining, damaging the roof rock, so some new problem to be brought for the protected seam mining upper protective layer brought certain difficulties, especially put forward higher request to the quasi roadway layout.In this paper, combined with specific examples of upward stress releasing mining in mining area II5Zhuxianzhuang mine Huaibei Mining Group mainly from the following several aspects to analysis and summary;①Through the establishment of overlying rock destruction of the tensile failure and shear failure model, it is concluded that the main roof breaking forms, the weighting step distance of initial and periodic, again according to the empirical formula to estimate the "two belts" of overburden rock height and stability of overburden rock cycle;②Using FLAC3D numerical simulation software for simulating10coal excavation, and after analysis summarizes10coal mining overburden deformation and failure of protective layer, eight coal deformation and failure of the law, at the same time, choose a different location, comparing simulation of roadway excavation, and then judge the roof of roadway excavation right position;③Through laboratory similar percentage of analog simulation experiment, simulation of excavation, reveal upward pressure relief mining overburden deformation and failure of stress distribution and deformation of overburden rock failure stable cycle;④Through layout monitoring point at original roof roadway on10coal in coal mining area115in Zhu Xianzhuang ore huaibei mining group, according to long-term observation data deduce upward pressure relief mining strata deformation and failure stable cycle.