. .. . .. 学习参考 目录 一、编制依据····················································3 二、工程概况····················································3 1、项目概况··················································3 2、地质地貌概况··············································4 3、设计概况 ·················································4 4、施工特点··················································4 三、施工安排···················
土方开挖放坡系数 根据目前用的《建筑工程消耗量标准》在第一章:土 方工程:沟槽开挖放坡系数 土壤类别 放坡起点( m)人工挖土 机械挖土 在坑上作业 在坑内作业 一、二类土 1.2 0 1 :0. 5 1 :0. 3 3 1 : 0.7 5 三类土 1. 5 0 1 : 0.3 3 1 : 0.2 5 1 : 0.6 7 四类土 2. 0 0 1: 0.2 5 1: 0. 1 0 1: 0. 3 3 破度系数:指坡面水平方向的投影长度与它在垂直 方向的投影长度的比值,与坡度互为倒数。 坡度系数用 K 表示,即 K= b / a 首先,土方边坡坡度 = H / B(基坑高度 /放坡宽度) 然后,(定额中)放坡系数 = 1 / ( B / H ) 所以, m = B / H 称为坡度系数 根据土方工程定额,对计算挖沟槽土方放坡系数规定 如下: ( 1 )挖土深度在 lm 以内,不考虑放坡; (