Analysis On Regional Hydrogeology Condition Of The5^th,7^th, And11^th Mine In Pingdingshan Coal Field

Taking the study area5th,7th,11thmine as a whole region, this paper systematiclyanalyzes and studies the geological and hydrogeological conditions of the study area onthe basis of collecting the geological and hydrogeological datas. The geologicalconditions are more complex and the fault and fold are development according to theresearch of the study area. Under the control and influence of the Guodishan normalfault, the Pingdingshan coal area is divided into two hydrological units, that is, thesouthwest and northeast hydrological units. The study area is in the west hydrologicalunit and the hydrological condition is very complex. The main aquifers in the study areaare the Carboniferous Taiyuan formation and Cambrian limestone aquifers, and themain aquifuges are the mudstone and sandy mudstone aquifuge. The main rechargesources of the mine water are the atmospheric precipitation, surface water and aquiferwater.The occurrence law of the limestone confined water is obtained by analyzing itsoccurrence characteristics, and that is there is a negative correlationship between thelimestone groundwater water-bearing and the buried depth of the limestone. The waterflow of the shallow and deep parts of the Cambrian and Taiyuan formation limestonewas calculated respectively by the steady flow method.As a sample, the persistence of water inflow in the5thmine was analysed by themethod of time series R/S analysis and the value of water inflow was estimated by themethod of grey system theory. The water inflow of the mine in the years of2012and2013respectively are1026.138m3/h and1042.688m3/h.According to the actual conditions of the5th,7th and11th mines in study area, theprevent and control measures are put foward, which taking dropping pressure bydrainage as primary, grouting for water-proof and grouting strengthening as supplement,and combining with many other kinds of methods.