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。
The formulae for dynamic calculations of underground rock cavity with liner are also given here.
文中还给出了有衬砌的地下岩洞动力计算方法。
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。
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