Natural sinkholes generally form when heavy, water-saturated soil causes the roof of an underground limestone cavity to collapse, or when water widens a natural fracture in limestone bedrock.
一般自然灰岩坑形成机理是由于有份量的水饱和土导致地下石灰岩洞顶层坍塌，或者由于水加宽了石灰岩床的天然裂缝而导致。
This article analyzed in brief the cause, which triggered the collapse of wall rocks during the cavity construction, the prevention measure and general principle of treatment.
本文简要分析了洞室施工中引起围岩坍方的原因，坍方的预防措施及治理的一般原则。
The study results show that the activity of underground water plays a key role in the whole process from the cavity formation to the occurrence of ground collapse.
研究结果表明，地下水的活动在土洞的形成到地表塌陷产生的全过程中起着关键性的作用。
To reveal the mechanism of karst collapse induced by groundwater pumping, the authors analyse the expanding condition of soil cavity by analytical method and put forward the concept of spalling force.
为研究人工抽水引起的岩溶地面塌陷的机理，用解析法分析了土洞扩展的条件，提出了剥落力的概念，认为土洞的扩展条件是剥落力大于土体抗拉强度。
No septal hematoma, abscess, perforation, nasal cavity adhesion, or bridge collapse were encountered.
无鼻中隔血肿、脓肿、穿孔、鼻腔粘连、鼻梁塌陷等并发症发生。
In this way, the entire hood forms a protective air bag outside the automobile, even though some air cavity breaks for some reason, other air cavities will not collapse and can keep working.
这样整个车罩就在汽车外面形成了一个保护性气囊。即便某个气腔因某种原因破碎后，其它气腔不会塌陷而能继续工作。
In this way, the entire hood forms a protective air bag outside the automobile, even though some air cavity breaks for some reason, other air cavities will not collapse and can keep working.
这样整个车罩就在汽车外面形成了一个保护性气囊。即便某个气腔因某种原因破碎后，其它气腔不会塌陷而能继续工作。
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