Safety Evaluation On Wugou Coal Mine 1033 Mechanized Mining Face Water Control Before Mining

Our coal threatened by water damage large wide and frequent water inrush hazards flooding accident, not only big economic loss, but also destroyed the mine ecological water environment, also causing serious social harm.Above the main floor Wugou Coal Mine coal research projects directly covered with gravel aquifer, water and other bottom-rich limestone aquifer and faults are well developed, it is subject to Cenozoic "Quaternary aquifer", roof water from sandstone crack, floor limestone water, water, four kinds of fault water threat seam mining.Mine design a variety of waterproof coal pillar leaving in the amount of up to 36.65 million tons, in order to secure efficient recovery of coal resources,coal mining and Water trapped in front by the safety evaluation is necessary.In this paper, Wugou Coal Mine fully mechanized mining face in 1033 as the background, using the theoretical analysis and numerical simulation methods, a comprehensive analysis of the impact of mining safety engineering geology, hydrogeology and mining engineering technical conditions, focusing on the bottom of the Quaternary loose layer pore aquifer(Quaternary aquifer), water-filled coal seam roof sandstone aquifer,confined aquifer limestone floor and fault fracture zone four kinds of water damage type, a comprehensive assessment of the security forecast 1033 fully mechanized mining face in multi-source water harmful effects mining conditions, the former mining face in the prevention and treatment of water safety evaluation.First through the ground seismic exploration, surface drilling, underground transient electromagnetic detection, detection through the pit radio waves and other geophysical methods for geological and hydrogeological conditions Face a comprehensive exploration drilling near the working face based on geological data indicate disclosed lithology 10 coal roof and floor, while the top 10 coal seams, bottom rock samples were taken in the physical and mechanical properties test results, the main physical and mechanical characteristics.According to the analysis flood 1033 Face factors, according to the inspection report and the relevant technical regulations for roof sandstone aquifer probed take the floor grouting transformation method combining hydrophobic buck Floor Limestone Water prevention, to reduce too gray projections water coefficient.Numerical simulation FLAC3 D use to predict the effects of too much gray water inrush and fault to surface mining.Basic water filling factors in the identification and exploitation of hydrogeological conditions when the predicted water inflow during underground mining, according to the maximum water inflow forecast, conducted a working surface drainage system design.The paper analyzes evaluated the impact of various water bodies on safe mining working face, the results showed that:(1)Quaternary aquifer less impact on the mining face in 10 coal roof and floor sandstone aquifer within the range of most of the working face area rich aqueous weak coal seam mining in water-filled little effect;(2)1033 Face seam floor siltstone and fine sandstone or sandy mudstone interbedded medium hard rock, roof rock type is weak- the overlying hard rock types;(3)1033 Face Cover Quaternary aquifer a thickness of 10.1 ~ 19.45 m, Unit inflow q is0.0076 ~ 0.0339 L /(s·m), permeability coefficient K is 0.0271 ~ 0.104 m / d, is a weak aquifer, water mining grade ? class water body, can stay with sand proof coal pillar mining; other analogy that 1033 Face Fully mechanized Face require leaving in the sand coal and rock pillars height of 39.91 m, leaving in less than the actual coal pillar 47.78m;(4)1033 face floor maximum water inrush coefficient of 0.051 ~ 0.125 MPa / m, the local area greater than the critical water inrush coefficient, but by grouting transformation,water inrush coefficient becomes 0.033 ~ 0.059 MPa / m, less than the critical water inrush coefficients, so after grouting mining Face with the presence of water inrush less dangerous, with safe mining conditions.(5) In F1033-7 fault, for example, use FLAC3 D numerical simulation software to study fault Mining activation features.The results show that: F1033-7 obvious fault activation feature does not appear in the face advancing the process, does not have a serious impact on the working surface when the fault zone containing a small part of water.According to the results of the analysis to develop a practical Water Control measures to ensure the safety of mining face in 1033, similar to Face Flood Control of important guiding significance.