?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.relation=http%3A%2F%2Fd-scholarship-dev.library.pitt.edu%2F21067%2F&rft.title=Quantification+of+the+Factors+Influencing+the+Performance+of+Hydraulic+Barriers+in+Western+Pennsylvania+Underground+Coal+Mines&rft.creator=Mignogna%2C+Lucas&rft.description=Present+regulations+prohibit+surface-water-impairing+discharges+from+abandoned+underground+coal+mines.+++However%2C+some+recently+abandoned+mines+in+western+Pennsylvania+have+experienced+unplanned%2C+high-flow+discharges.+The+Surface+Mining+Control+%26+Reclamation+Act+of+1977+requires+underground+coal+mines+with+acid-forming+potential+to+mine+down-dip%2C+establishing+a+protective+barrier+capable+of+containing+the+resultant+mine+pool.+The+primary+factors+responsible+for+the+performance+of+%E2%80%98down-dip%E2%80%99+hydraulic+barriers+are+complex+and+influence+the+design+process.%0D%0A%09This+investigation+characterizes+down-dip+coal+barriers+and+produces+a+set+of+general+guidelines+or+recommendations+applicable+to+%E2%80%98down-dip%E2%80%99+barrier+design.+To+identify+factors+influencing+barrier+performance%2C+several+detailed+case+studies+are+examined.%0D%0ACase+studies+of+the+Solar+7+%26+10%2C+Little+Toby%2C+Dora+6%2C+Grove+1%2C+and+Penn+View+mines+were+investigated.+The+research+included+detailed+analysis+and+select+modeling+of+hydraulic+coal+barriers+constituting+both+successful+and+unsuccessful+performances+in+western+Pennsylvania+underground+coal+mines.+The+analysis+shows+that+the+following+factors+impact+the+performance+of+hydraulic+coal+barriers%3A%0D%0A%E2%80%A2%09Primary+Factors%0D%0Ao%09Geology%2C%0D%0Ao%09Extraction+ratio%2C%0D%0Ao%09Hydraulic+conductivity%2C+and%0D%0Ao%09Overburden+thickness%0D%0A%0D%0A%E2%80%A2%09Secondary+Factors%0D%0A%0D%0Ao%09Hydraulic+gradient%0D%0Ao%09Barrier+thickness%0D%0A%0D%0AThese+factors+were+quantified+to+provide+guidelines+to+safely+engineer+a+barrier+given+a+set+of+conditions.+Ultimately%2C+this+analysis+will+aid+industry%2C+responsible+for+designing+these+structures%2C+and+regulatory+agencies%2C+responsible+for+approving+these+designs%2C+to+utilize+observations+from+this+analysis+to+reduce+the+potential+for+high-flow+discharges+from+abandoned+coal+mines.%0D%0A&rft.date=2014-06-16&rft.type=University+of+Pittsburgh+ETD&rft.type=PeerReviewed&rft.format=application%2Fpdf&rft.language=en&rft.identifier=http%3A%2F%2Fd-scholarship-dev.library.pitt.edu%2F21067%2F1%2FMignogna_Lucas_James_Pitt_2014.pdf&rft.identifier=++Mignogna%2C+Lucas++(2014)+Quantification+of+the+Factors+Influencing+the+Performance+of+Hydraulic+Barriers+in+Western+Pennsylvania+Underground+Coal+Mines.++Master's+Thesis%2C+University+of+Pittsburgh.++++(Unpublished)++