Tri-bench excavation method 三台阶开挖法
heading and bench excavation 导洞与台阶开挖
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。
参考来源 - 软岩隧道钻爆法施工扰动范围的研究·2,447,543篇论文数据,部分数据来源于NoteExpress
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