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1,【案例】某挡土墙高5m,墙背垂直光滑,填土表面作用有均布荷载,= 18kN/m3 , =30, c1=0。采用MU30毛石M5混合砂浆砌筑,基底摩擦系=0.5,砌体重度= 22kN/m3 。试设计挡土墙构造尺寸。,【分析】根据设计条件,应用朗肯理论计算:,根据构造要求拟定断面尺寸:,墙顶宽度:0.8m H/12(0.5m),墙底宽度:3.0m H/3 H/2,取1m墙长为计算单元计算自重:,G1=0.53.01.022=33kN,2,4.5m,0.5m,0.8m,G1,G2,G3,G4,3.0m,1.7m,0.8m,0.2m,0.3m,3,G2=1/21.74.51.0 22=84.15kN,G3=0.84.51.0 22=79.2kN,G4=0.24.51.018=16.2kN,G= G1 + G2 + G3 + G4 =212.55kN,取1m墙长为计算单元计算土压力:,4,Ea1=0.675=3.3kN/m,Ea2=1/2(30.67-0.67)5=75kN/m,E= Ea1 + Ea2,抗滑移验算:,抗倾覆验算:,故墙体稳定性合格,尺寸设计合理。,5,计算简图,0,