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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。
During the process of cutting construction, some of the karst caves that were not originally open on the original slope may be partly exposed or the roof may be thinned. At the same time, the blasting construction may be carried out Deterioration of the structure and physical and mechanical properties of the shallow caverns roof so that some of the roadbed formed by the backfill soil is located on the thin roof of the open karst form or karst cave and has the danger of karst collapse. This paper summarizes the basic characteristics of karst collapse of rock-fill roadbed in karst mid-low mountainous area, and analyzes the development of karst system in the soluble rock slope. Combined with the field discrimination of open karst in some sections of Nankun Railway, Methods The collapse risk of rockfill embankment was evaluated.