The Reserch Of Mining Under Safe Waterpressure And Floor Damage Depth Test In Liu Jia-zhuang Coal Mine

This paper aimed at the water problem of mining with Ordovician limestone water pressure on first mining face of Taiyuan coal group in Liliu mining area Liujiazhuang coal mine,based on the test of the failure depth of the 80102 working face and the hydrogeological conditions of the Ordovician limestone aquifer under the working face,analysis of working face with pressure mining safety,put forward the scientific control of water countermeasures,to ensure safe and efficient production of mine.The field test(exploration)first-hand information and hydrogeology,groundwater dynamics,water chemistry and rock mechanics theory and method,the hydrogeological drilling,pressure water test,water quality analysis,dewatering test,hydrological observation data,"floor broken depth special tests,FLAC3D numerical simulation technologies,to Liujiazhuang coal mine 80102 working face with pressure mining safety is studied.Through the underground borehole pressure water test,the maximum depth of the 80101 working face is in the 16.32?16.92m.Through the dynamic observation of the development of the fracture zone in the mining process,the failure depth of the floor was found to the maximum at 7?15m after the mining face.By on 8 different seam width of working face floor affected by the mining impact failure simulation comparison of the calculation results,it can be concluded that in Liujiazhuang coal mine,working face width on the floor by the influence of mining damage depth influenced by the obvious,the relationship curve is ladder shaped,linear transform and wide 160?220m.With the increase of the width of working face,mining dynamic rupture depth increased slightly.When the width of the working surface is 220-260m,the depth of mining is not changed,but after more than 260,it shows a linear trend.According to the simulation results,the failure depth of the floor of the 80102 working face is 18m.From the depth of the floor,the thickness of the aquifer and water resistance,water content and water inrush coefficient,water inrush coefficient,water resistance coefficient and other aspects of the 80102 working face with pressure mining safety.Through the study,the fracture zone of the bottom plate is not developed to the top surface of aquifer,which is the first decisive factor.Isolation layer thickness larger,structure has good resistance to water and water inrush coefficient is less than the critical value of the rules of,water resistance coefficient of larger,isolation layer impedance pressure greater than Ordovician limestone water pressure.These research results for working face with pressure mining provides powerful guarantee.Based on the research results of this paper and results achieved in the Liu Jia Zhuang coal mine 80102 working face with pressure mining safety of,obtain good economic and social benefits.Results of the project of Liu Jia Zhuang other mine of Taiyuan Formation coal mining and from Liu mining area of otherwise similar mining with pressure have important reference significance.