caving

However, the caving maybe happen because of too large transmogrification and rheologic fracture to high crustal stres.

变断裂准则，最终形成了诱导条件下节理岩体持续大规模自然崩落判据。

It may also be referred to as "draining" (when exploring drains) "urban spelunking", "urban caving", or "building hacking".

它同样也被称为“下水道探索”，“城市洞穴探险”，“建探险”等等。

Practices have proved that quick advancing techniqe is applicable in isolated unmined area Comprehensive top coal caving face.

实践证明,孤岛综放工作面快速推进技术是可行的。