Terms containing half section excavation method

Subject	English	Chinese
tech.	half section excavation method	开挖法
expl.	heading excavation method of lower part of upper half cross-section	上半断面下部导坑掘进法隧道开挖方法之一,即在全断面开挖过程中,遇到地质条件不稳定的岩层时,可采用上半断面和下部导坑同时爆破掘进的开挖方法施工