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https://www.civilgroup.org/viewtopic.php?f=28&t=20560
NBA 寫:砂礫層γs = Gs*γw = 2.0*1 = 2t/m^3黏土層γsat = 1.5t/m^3礫石層γsat = [(Gs+s*e)/(1+e)]*γw = [(2.2+1*0.2)/(1+0.2)]*1 = 2t/m^3