1.=(85+8*0.5)*(60+8*0.5)*8+1/3*(8*0.5)^2*8
=45610.67
2.=45610.67-21000=24610.67m3
3.=21000m3
4.=21000*1.14/3.5=6840车
:基坑总体积为: 上口长85+8×0.5×2=93m,上口宽60+8×0.5×2=68m (土方开挖)总体积为:8×(85×60+4×89×64+93×68)÷6=45610.7m3 回填土方为:43162.7-21000=24610.7 m3 预留松土量为:24610.7÷1.05×1.14=26720.2 m3 外运土方量为:45610.7×1.14-26720.2=25276 m3 需用运输车次:25276÷3.5=7221.7车,取7222车