三桩承台的计算公式（及垫层）是什么?怎么算?

H2*H2*1.155*3/20B、三桩承台垫层面积（只需基础大小参数）H1H2B0.5*(H1+0.1+2*(H2+0.1))*((H2+0.1)*1.155+B+0.231)-(H2+0.1)*(H2+0.1)*1.155*3/20.03465C、三桩承台土方不放坡（加0.4）挖深H1H2B(0.5*(H1+0.4+2*(H2+0.4))*((H2+0.4)*1.155+B+0.924)-(H2+0.4)*(H2+0.4)*1.155*3/2)*H3H30D、三桩承台土方（放坡,加0.4）挖深放坡系数H1H2B(0.5*(H1+0.4+2*(H2+0.4))*((H2+0.4)*1.155+B+0.924)-(H2+0.4)*(H2+0.4)*1.155*3/2)*H3+(B+0.924)*3/2*K*H3*H3+1.155*K*K*H3*H3*H3H3K