Study For The XIQU Of The Section Coal Pillar For The Technology Of The Reasonable Retainment

In this paper,Xishan CoalMineGroupWestsongas the back ground,Through fieldinvestigation,theoretical analysis and calculation,And using numerical simulation andverification of similar material simulation integrated approach to rational Xiqu18,503face along goaf narrow width of the left pillar design were studied and put forwardreasonable and effective full support solutions.By caving activity patterns on the overburden and coal pillar mine roadway andpressure distribution corresponding to Calais theoretical analysis,The rearsection ofthe draw in caving goaf stability,Breaking the curved roof of the triangular blockproduces coal sector generates lateral pressure,so that the body produces coal crushingzone,plastic zone,elastic zone and the originalstress area.And on thisbasis, the resultsnarrow pillar and roadway stress state at different times,Therefore thus have to bringthe situation in the surrounding rock deformation in different periods,after leaving inthe roadway should be drawn in coal relief area, and narrow coal pillar design, thefocusison the pillar and roadway deformation control.Through the narrow pillar of strength and damage law analysis, the relationshipbetween coal pillar deformation of surrounding rock deformation,To arrive atfactorsaffecting coal pillar width roadway deformation and use of reasonable width limitequilibrium method pillar theoretical calculations.The calculated theoretical pillarwidthis based on the use of the current suspensionis widely used composite beamtheory and the theory of the proposed roadway pillar and support appropriate andreasonable solution.By numerical simulation and the relative ratio of similar material simulation,thetheoretical calculated validate coal pillar width，And concluded after its support afterthe surrounding rock deformation,stress state conduct simulation to arrive at the finalresult.