Taking the cross cave propping in Hanguguan Tunnel of passengers special line on Zhengxi railway, this paper introduces a new construction technique of propping - vertical propping method.

文章以郑西铁路客运专线函谷关隧道横洞挑顶为例，介绍了一种新型挑顶施工工艺——垂直挑顶法。

youdao

The paper introduces the treating construction technique of Micangkou tunnel underground buried river and cave at Three Gorges Dam alongside highway.

本文介绍了三峡库区沿江公路米仓口隧道地下暗河及溶洞的处理施工技术。

youdao

The geological disaster, such as cave of karst, rushing water and collapse often occur in tunnel excavation.

隧道在施工中不可避免地会遇到诸如溶洞、突水、坍塌等常见的地质灾害。

youdao

The bomb ignites the particles over a period of time, allowing them to spread further into a cave or tunnel, thus producing a larger explosion.

CNN: Pentagon to use new bomb on Afghan caves

The Cave of the Winds not a cave, but a tunnel blasted out of the rock and a boardwalk taking you into the waterfall's spray.

NPR: Excerpt: 'Inventing Niagara'

An effort to send rescuers through the collapsed mine tunnel to attempt an underground rescue was suspended last week, after a new cave-in killed three rescuers and injured six others.

CNN: Crews prepare for final rescue effort at Utah mine