摘要
介绍在隧道严重塌方段,采用管棚实现一次20m超前支护的实践经验。
Abstract: In the article, the author introduces the practical experience about how to realize pre-support,
20m every time,by using pipe shed in the tunnel section of serious collapse.
出处
《探矿工程》
1993年第5期60-61,共2页
Exploration Engineering(Drilling & Tunneling)