n.洞穴探察；崩落開(kāi)采法；塌落

Caving means exploring the passages underneath the hills. 洞穴探險(xiǎn)運(yùn)動(dòng)是指探察山中的通道而進(jìn)行的活動(dòng)。

Sublevel caving without sill pillar is used in Xishimen Iron Mine. 西石門鐵礦采用無(wú)底柱分段崩落采礦法開(kāi)采。

The predicting results can be used as the basis for design and practice of block caving. 預(yù)測(cè)結(jié)果可以作為自然崩落法工程設(shè)計(jì)與實(shí)施的參考依據(jù)。

The formation is unstable and the well caving are severe. 地層不穩(wěn)定，井塌嚴(yán)重。