青藏铁路石膏岩溶路基病害原因分析

The analyses of the reasons of anhydrite karst along Qinghai-Tibet Railway

石膏岩溶在我国分布比较少。青藏线雁石坪地区发育有石膏岩溶。2006年9月在青藏铁路雁石坪以南约20km处,铁路右路肩及路基边坡发生地表塌陷。文章首先分析了病害发育地段的工程地质条件,包括本段的岩溶发育情况。结合勘察,分析了路基发生病害的原因,提出石膏岩溶发育区的路基病害工程处理措施意见。

The Anhydrite karst＇s area is rare in China, which has been developing in Yanshiping zone of Germud-Lahsa on Qinghai-Tibet railway. In September 2006, it occurred the land-subsidence at the right shoulder and slope of the railway embankment, about 20km south from Yanshiping town. In this paper, the geological condition was analyzed in subgrade hazard zone about anhydrite karst, including the characteristics of anhydrite karst growth. By the geologic investigation, the reason of subgrade hazard was summarized, then, the opinion about mending disease was put forward, which can serve as a reference for the similar condition.