Cave, soil cave and the collapse caused by them have been paid more and more attention in Karst region.
岩溶区的溶洞、土洞及其产生的塌陷越来越受到人们的关注。
The stress distribution around the soil cave will changed due to variation of groundwater level, then the soil mass around the cave may plastically fail and the soil cave may enlarge or collapse.
地下水位的变化，将使土洞周围土体的应力状态发生改变，并有可能导致土洞周围土体产生塑性破坏，使土洞进一步扩大甚至塌陷。
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