The Research On Supporting Technology Of Roadway In The Middle Of District Sublevel Coal-pillar In Ruineng Colliery

Ground pressure theory suggests that it is great pressure on both sides of district sublevelcoal-pillar in mined-out area of long-wall, it should be restricted to make roadway in thiscoal-pillar. Ruining coal mine of Shaanxi Coal Industry Company is exhausted of resourcesmine. In order to solve urgent requirement of lives of workers in the mine, the company triesto recycle about25m of coal-pillar and drives roadway and gets digging coal in middle ofdistrict sublevel coal-pillar of between of NO3005and3006mined-out area, and test howterrible pressure in this readway and support successful to the roadway.Pressure is huge bothin roof and sides, floor up is very serious when it is drived roadway over. So it abandons theidea of recovery coal-pillar and uses the roadway as the main roadway in order to speed upthe exploitation of coal resources. Therefore,it is urgently technical problem which is solvedto repair broken the roadway in middle of district sublevel coal-pillar.Base on field investigation, supporting conditions of district sublevel coal-pillar inRuineng colliery are analyzed. According to mechanic experiments, mechanical parameters ofdistrict sublevel coal-pillar are obtained. Aid to physical simulation experiment, analysisdeformation destruction regularity in surrounding rock of roadway with rectangular sectionand arched section. Software of FLAC^3Dare adopted to compute feasibility of supporting planwhich are anchor.cable+gunitematerial+credible.metal.long+leg.canopy+column,semicirculararch cushion support, semicircular arch slanting leg support and anchor lock legs roadwaysupporting, the plan of supporting is gotten with engineering practice and in-situ monitoring.It indicates that combining support “anchors and anchor cable+gunite material-semicirculararch cushion support+column”is efficient method to achieve in-situ roadway supporting.The research applies to solve technology problems of roadway in high pressurecoal-pillar, and a reference for roadway support in high pressure.