The bench excavation of combining short-hole with deep-hole blasts was adopted. 采用了浅孔和中深孔爆破相结合的台阶开挖方法。
In the excavation of foundation pit and foundation bench in shallow aquifer area, the problem of dewatering will be involved. 在含水层较浅的地区开挖基坑及基槽，都涉及到降水问题。
The construction technique of deep-hole bench blasting and presplitting blasting applied for excavation of Dadingzhishan Lock engineering is described. 介绍大顶子山船闸工程闸塘石方开挖中深孔梯段爆破、预裂爆破施工技术。
词组短语
短语
rock bench excavation 岩台开挖
heading and bench excavation 导洞与台阶开挖
top heading and bench excavation 上下台阶开挖
Tri -bench excavation method 三台阶开挖法
three -bench seven-step excavation method 三台阶七步开挖法
专业释义
交通运输工程
台阶开挖
On the upper bench excavation, the length is about 6-8m in vertical direction which the fractured zones is affected by blasting vibration. 上台阶开挖时,爆破振动对松动区的影响在纵向开挖距离约为6-8m,松动区稳定后厚度约为2.2m;而在下台阶开挖时,这个距离增大为8-10m。
