Analysis on probability of water inrush and quicksand in different mining sequences under an unconsolidated alluvium aquifer by fluid-solid coupling theory.pdf

JoURNAL oF CoAL SCIENCE ENGINEERING (CHINA) DOI10．1007／s12404-012—0111-2 PP 60-66 Voi．18 No．1 M ar．2012 Analysisonprobability ofwaterinrush and quicksand in different mining sequences under an unconsolidated alluvium aquifer by fluid—solidcouplingtheory CHENLu．wang’QINYuan，GUIHe．rong。ZHANG Shi—lei ， ， 1．SchoolofResourcesandEnvironmentalengineering,HefeiUniversityofTechnology,Hefei23000~China 2．HaikouCiytUrbanPlanning＆DesignInstitute,Haikou 57010~China 3．SchoolofEa~hSciencesandEngineering,SuzhouUniversiyt,Suzhou 234000,China ◎TheEditorialOfficeofJournalofCoalScienceandEngineeringfChina)nadSpringer-VerlagBerlinHeidelberg2012 Abstract Tostudythebehaviorofoverlyingstrataandthe1ikelihoodofwaterimushandquicksandwithdifferentmining sequencesunderanunconsolidatedalluvium aquifer,anumericalmodelbasedonhtefluid—solidcouplingtheory wascon-- structedbyFLAC ．Simulationresultsrevealedthattheminingsequenceshadasignificantinfluenceontheseepage，dis— placementandfailurecharacteristicsofhteoverlyingstrata．Inthiskindofgeologicalandhydrogeologicalconditions，the workfaceclosetohteoutcropofcoalseam easilysuffersfrom waterimu shnadquicksandduringmining．Inthesimulationre- sults．theplasticzone．verticaldisplacementandporewaterpressureinhteoverlyingstrataoftheworkfacedecreasemoreor lessusingtheupwardminingsequencethanusingthedownwardminingsequence．Therefore，theapplicationoftheupward miningsequenceintheprocessofminingispreferentialtopreventwaterimu shandquicksand． Keywords waterinrush，quicksand，m iningsequences，solid—fluidcoupling portanttheoreticalachievementshavebeenobtained． Intr0ductiOn Forinstance．Yueta1．(2001)investigatedthemecha． W aterinrushandquicksandofminingunderanun — nism ofretainingasandproofcoalpillarun deranin— con