A Study On Setting Up Reasonable Scale Of Pillars For Preventing Water Under Fault Conditions

Large-scale faultzone has a low intensity and easy sliding deformation, permeability,rcsistance to deformation. And destroyed the integrity of the rock. Roof and floor rock stable performance with its own carrying capacity, And after coal seam mining,it often become channels about the mining Cracks and aquifer Jeopardize mine safety production.as the relevant rule,large fault broken to bring both sides of the footwall are required to stay safe waterproof coal pillarslocated50m above,cause a lot of loss of coalresources. In recent years, As increased of the aquifer grouting reinforcement of adaptive technology, fine detection Part of the mine is also a narrow fault waterproof pillar mining engineering practice. Achieved good results. However, due to the fault Safety Pillar reasonable leaving in research rarely, There have been significant water inrush,so, To carry out the threat of flooding of the coal and rock pillars of coal seam faults reasonable to stay based technology research has important theoretical significance and application value.In this thesis, five coal mine narrow fault waterproof pillar mining as the background, according to the historical drilling, geophysical and underground tunnel expose data and field test results,study and comprehensive analysis of the fault hydrogeology and engineering geology of the F14, F6.Further confirmed the F14, F6is the water-free fault and not water conductivity fault. The mechanical parameters of rock mass and structure of fault zone rocks is given based on the physical and mechanical properties of the samples tested, comprehensive set of fault types and their. According to mine geological and mining conditions, the establishment of a geological fault zone rock mechanics model.On this basis,FLCA3D set different scale of the coal pillar on both sides, carry on numerical simulation to evolution characteristics of the roof and floor cracks after mining,reveal mechanism and conditions of the five coal mine fault coal pillar safe mining,getting the conclusions can greatly reduce the waterproof pillar,And successfully applied in the F14,F16fault pillarmining engineering practice, improve the recovery rate of coal resources,enrich and develop our fault waterproof pillar mining techniques.