The formation mechanism of cave and soil cave has been analyzed.
对溶洞和土洞的发育机制进行了分析。
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 seepage erosion and disintegration produced by the activity of ground water will result in formation of soil cave.
岩溶区地下水或地表水的活动，将对土层产生潜蚀作用及崩解作用，进而形成土洞。
Research methods: Based on the elastic and plastic theory, the stress distribution of soil cave in foundation can be deduced in karst region.
研究方法：根据弹塑性理论，推求得到岩溶地基中土洞周边土体的应力状态。
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。
This can be simply an area of damper soil, if the enclosure is large enough, or a humid hide-box or cave.
如果饲养环境足够大时，只需要增加一个比较潮湿的泥土区域，或一个潮湿的遮蔽处或洞穴。
The stability of arching cave is analysised. and the relations of embedded soil depth and the ultimate arch span are presented.
推导出土中洞室的上覆土厚度及相应的最大跨径公式。
The stability of arching cave is analysised. and the relations of embedded soil depth and the ultimate arch span are presented.
推导出土中洞室的上覆土厚度及相应的最大跨径公式。
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