| L coalmine is located in the second stage of the eastern part of Yulin-Shenmu mine area,which has 6 minable seam layers.4-2 Coal seam is the main work bed inside the mine,which lies in the top of the second paragraph in Yan'an group.In order to ensure the successful production capacity and the safety of the mine production,it is necessary to analysis the changes of the hydro-geological conditions in mining field and to do mine flood prevention.The paper is based on the existing data,which has first carried on the analyses and research on the regional groundwater system,mine boundary and hydraulic properties,the structure of the mine groundwater system.Secondly,analyzing the actual observation data,it studied the crack zone development law of roof,using the overburden related theoretical analysis,numerical simulation,similar material simulation.Then it studied the development mechanism of bottom water flowing fracture from the following four aspects:floor mining-induced damage depth analysis and calculation,floor mining-induced fracture numerical simulation analysis,coal floor secondary deepen the analysis and simulation and test the depth of the disturbance of coal floor water injection.Basically,it achieved the following understandings:First of all,the watery poorness in sandstone layer of L coal strata and nearby area;Secondly,based on factors such as water,sand,passage the water inrush sand dyke danger division,in the high strength case,there are possibly collapse of sand and water inrush of sand in some local place in L coal mining;Thirdly,the most intense part of the working face of Lead water crack development is in the right of middle,and crack zone envelope arch type;Finally,the distance between each seam is close,the old empty water under import group on coal mining face was due to coal mining group of coal mining under slab damage zone and cracking connected zone,causing water accidents.Therefore,sparse openness must be firstly do for the lower mining coal. |
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