放坡挖沟槽、基坑土方公式二、挖沟槽:1.垫层底部放坡:放坡高度由垫层底至室外地坪V=L*(a+2c+kH)*HL-沟槽长度;a-地梁宽;K-放坡系数;H挖土深度2.垫层表面放坡:放坡高度由基础底至室外地坪V=L*{(a+2c+KH1)H1+(a+2c)H2}L-沟槽长度;a-地梁宽;K-放坡系数;H1基础底至室外地坪;H2垫层厚度三、挖基坑(放坡)方形:V=(a+2c+KH)*(b+2c+KH)*H+1/3*K2H3(K平方H立方)a.b-宽度和高度;K-放坡系数;H挖土深度圆形:V=∏/3*h*(R2+Rr+r2)r:垫层半径,R=r+HK(H:挖土深度;K:放坡系数)