.1.荷载计算: (1)水上土压力: a=h3-h4=-0.8- -3.8=3(m) b=h2-h3=-0.3- -0.8=.5(m) q11=0.5 * * b=0.5 * 18*.5=4.5 (kN/m)MB11 =0.5*q11*b*(a+b/3)=0.5*4.5*.5*(3+.5/3)=3.563 (kNm) (2)水下土压力: q21 =0.5*(-10)*a=0.5*(18-10)*3=12 (kN/m)MB21 =1/6*q21*a2=1/6*12*32=18 (kNm) (3)水压力: q31 =10*a=10*3=30 (kN/m)MB31 =1/6*q31*a2=1/6*30*32=45 (kNm) (4)附加荷载: q42 =0.5*Qfj=0.5*10=5 (kN/m)MB42 =0.5*q42*(a+b)2=0.5*5*(3+.5)2=30.625 (kNm)MBk =MB11+MB21+MB31+MB42=3.563+18+45+30.625=97.188 (kNm