岩溶中低山区岩石路堑填土路基塌陷危险性判识研究

The anaylisis and prediction of karst collapse in fill sub grade of rocky gutting slope in Karst mountainous area

铁路在通过岩溶中低山区时大量采用了岩石路堑和人工填土路基 ,在路堑施工过程中 ,可能会有一部分原来未在原坡面开口的溶洞被部分揭露或顶板被削薄 ,同时爆破施工可能恶化浅埋溶洞顶板的结构及物理力学性质 ,从而使回填部分土石方形成的路基坐落于开口岩溶形态或溶洞的薄顶板上 ,具有发生岩溶塌陷的危险性。本文总结了岩溶中低山区岩石路堑填土路基岩溶塌陷发育的基本特点 ,分析了可溶岩边坡岩溶系统的发育规律 ,并结合南昆铁路部分区段开口岩溶的野外判别 ,提出使用逐步判归方法对岩石路堑填土路基的塌陷危险性进行评价。

A large number of rocky cutting slopes and fill sub gardes are adopted when a railway runs though a Karst mountainous area. Because of cutting slope's construction, it is possible that the Karst cave not exposed on slope is uncovered, the cave roof becomes thinner of the physical and mechanical rocky roof characters of become worse, which may lead to the appearance of Karst collapse. In the paper, the basic law of development of Karst system inside carbonate rocky slope is analyzed and the basic characters of Karst collapse developed in the fill sub grade of rocky cutting slope are summarized. The method distinguishing Karst cave artificially exposed in field and a method predicating the Karst collapse are also discussed with the examples of NANING KUNMING railway.