徐州市区岩溶塌陷机理研究

Study on Mechanism of Karst Collapses in Xuzhou City

研究了徐州市区岩溶塌陷的机理：岩溶洞穴的发育为塌陷提供了先决条件，强烈开采岩溶水导致其水位持续下降，独特的土层结构增强了潜蚀作用，促进了土洞的形成与发展．水位骤降导致土体失去浮托力，火车运行和建筑施工振动，导致土洞顶板失稳，是塌陷的触发性动因．

This paper deals with mechanism of karst collapses in Xuzhou city. The authors suggest that cave in bedrock is a prerequisite of karst collapse. Continued declines of karst water-level caused by intensive pumpage and special structure of unconsolidated lays both strengthen the suffosion and promote development of cavity in unconsolidated layers. Sudden loss of buoyant support caused by rapid dropdown of karst water-level and vibration resulted from train past and building construction both contribute to trigger agents of the collapses.