岩溶覆盖层塌陷的原因分析及其半定量预测

CAUSE ANALYSIS AND QUASI-QUANTITATIVE PREDICTION ON THE COLLAPSE OF KARST OVERBURDEN

在岩溶地区，覆盖层的塌陷成了工程建设的主要地质灾害之一。从广东省内三个大型公路建设工程发生的地面塌陷事故出发，概述了三大工程的地貌条件、工程地质条件和水文地质条件以及塌陷情况，详细分析了发生塌陷的机理及原因，井在此基础上，总结出发生塌陷的基本条件和影响塌陷的地质因素，按这些因素水平，赋予相应的权重，以此作为预测的依据，探讨在工程实践中如何更有效地对塌陷进行预测。最后，根据发生塌陷的机理，简要地提出在工程实践中的处理措施，达到指导生产的目的。

In the karst district, the collapse of overburden has been become one of major geological hazards met in engineering construction. In the light of overburden collapses occured in the three large-scale highway construction projects in Guangdong Province, the general topography configuration, engineering geology and hydrologic geology condition, and collapse circumstance of the three projects are summarized. The mechanism and cause of collapse are analyzed in detail. On this foundation, the basic condition and geology function to affact collapse are summed up. The corresponding power weight is assigned according to different factor levels. Finally, on the basis of collapse mechanism of karst overburden, the treatment measure in the practice is briefly put forward to guide practice.