The Preharvest Water Control Safety Evaluation Of 9101 Fully Mechanized Caving Face

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.Therefore,to carry out by Ordovician limestone water,water and fault goaf water and other water sources before flood threat analysis mining face and its control,for Chang Heng mine production safety is important,but also very necessary.Now the domestic and foreign papers on the basis of relevant literature,Chang Heng in Shanxi coal mine fully mechanized caving face 9101 as the basis for collecting the mine hydrogeology,engineering geology and information on production technology,the use of mechanics,Flood Control and other related fields of knowledge,theoretical analysis,laboratory testing,numerical simulation research methods,the system analyzes the impact of multiple threats to water safety mining factors,focused on the mined-out area of water,coal seam roof and floor sandstone fissure water,floor Ordovician limestone water,fault et evolution under the influence of mining,is expected to face in the water inflow.The main results obtained are as follows:1.For the 9101 flood characteristics Chang Heng face,was mine hydrogeological conditions supplementary survey and design,construction Inoue under exploration drilling carried out three-dimensional seismic ground,underground transient electromagnetic,audio perspective and radio waves pit Face through the basic identification of nine coal from the floor spacing Ordovician limestone aquifer thickness and watery top floor features sandstone aquifer within the working face mining area faults form and swing range,including hydraulic conductivity and geophysical exploration abnormal range.The results showed: 9 coal roof and floor sandstone aquifer units Inflow 0.0359 L/s·m,permeability coefficient 0.000014m/d,water aquifer weak rich;9 coal seam floor Ordovician limestone aquifer unit water 16.667 L/s·m,mineralization of 1.698g/l,water aquifer is extremely rich;the inner face fault are normal faults,drop 0.8m 30.0m,has some water resistance.2.By uniaxial tests,triaxial tests,X-RD test and scanning electron microscopy tests,parsing the seam roof and floor strata microscopic ingredient,physical and mechanical properties characteristics,lithologic characteristics and structural features.9 coal seam in mudstone,sandstone,rock types are mainly quartz siltstone,clay minerals in rocks are mainly kaolinite;wherein mudstone（containing carbonaceous mudstone）gray-dark gray,smaller thickness,rock mechanics index is relatively low,mostly soft rock,poor stability;fine sandstone and siltstone handover good,rock hard and compact,high compressive strength,good stability.Roof and floor covering rock type is weak to medium hard type.3.According to the fan Lane 9101 Face of construction and drilling revealed the results of rock mechanics test data,the establishment of a working face mining engineering geological model usingFLAC^-3D analysis software,to simulate the 9101 working face advancing different distances（10m,30 m,50m,70m）floor failure evolution characteristics,calculate the floor failure depth under these conditions,and safety of water inrush coefficient impermeable layer thickness ratio coefficient.The results showed: 9 coal mining floor damage depth of 25.96 m,water inrush coefficient of 0.030 0.038MPa/m,safety impermeable layer thickness ratio coefficient of 0.4528 0.5500,regulations are less than the predetermined value,the exploitation of the working face less risk;useFLAC^-3D simulation 9 coal mining slice mining displacement characteristics,simulation results show that two faults occur along the fault plane sliding displacement of up to 0.6m,a small activation scope of the working face less risk,mining is safe and feasible,9101 Face with a safe mining conditions.4.To 9 coal mining hydrogeological conditions and flood factor analysis as the basis for the relevant regulations,specifications for the standards,Face Mining Water Inflow was expected when the 9101 mining face normal water inflow is expected to be 50m³/h the maximum water inflow is estimated to be 120m³/h,and Face drainage system design.5.The factor analysis and flood water inflow expected results,develop a practical technology to prevent water damage security measures and countermeasures.Four of coal mined-out area of water should be taken before using the drilling Drainage;roof and floor sandstone fissure water aquifer mainly to exploration;floor of faults and limestone aquifer after the first exploration grouting.