In time and space, the whole process of karat collapse can be divided into two phases: inter-collapse and surface-collapse in term of the formation of the critical soil-hole.

• 以临界土洞为界，岩溶塌陷的整个发育形成过程从时间和空间上划分为内部塌陷和地表塌陷两个密不可分的阶段。