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。

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