Experimental study on water filling activation and overburden rock deformation law in goaf
In order to study the"activation"mechanism of the old goaf and the overburden rock movement law under the water filling condition,we made a similar material model of the goaf based on the similar theory,simulated the water immersion state of the collapse zone of the goaf by artificial water injection,carried out the observation of the settlement and deformation of the overburden rock under the coal seam mining and water filling condition,and studied the deformation law of the overburden rock layer and the form of overbur-den rock damage after the water filling condition of the goaf.The results show that after the coal seam is mined,the collapse zone,frac-ture zone and bending zone will be produced from the bottom up,and the mining damage rocks will support the overburden rocks mass,making the hollow area exist at the boundary of the goaf;there are a lot of hollows and voids in the old goaf after the coal seam is mined,and the overburden rocks in the mining area will be"activated"after water filling,and the broken rocks in the collapse zone will be fur-ther compacted,the compaction degree in the middle area of the separation layer crack is higher than that on both sides.As the water filling time prolongs,the cracks in the overburden rock gradually expand,and the settlement in the goaf during the first observation of water filling is relatively large.Afterwards,there is a decreasing trend in the settlement of the rock layers;after water filling in the goaf,the subsidence of the rock layer above the collapse zone is the greatest.The closer the overburden rock is to the surface,the less impact the water filling in the goaf has on the overburden rock.
goafsimilar material modelwater fillingactivationoverburden rock deformation
万方数据
维普
