8.1 挡土墙高 H=5m ,墙背垂直光滑,填土面水平,作用无限均布荷载 q=-|||-4.0kPa,土体重度 =18kN/(m)^3 ,c=0 ,varphi =(30)^circ ,基底摩擦系数为 mu =0.4 ,地基承载力特-|||-征值 _(a)=200kPa 。挡墙采用MU10毛石砌筑, _(k)=22kN/(m)^3 ,M5水泥砂浆,截面尺寸-|||-如图8.42所示。试求:-|||-(1)验算挡墙的稳定性;-|||-(2)墙身截面抗压强度和抗剪强度验算。-|||-q=4.0kPa-|||-G3-|||-→-|||-2.0 0.5-|||-图8.42 习题8.1图