The mechanism of a railway landslide caused by rainfall
The mechanism of a railway landslide caused by rainfall
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降雨引发铁路滑坡的机理
DOI：
10.1007/s10346-010-0195-y
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发表时间：
2010-06-01
期刊：
影响因子：
6.7
通讯作者：
Zhang, Limin
中科院分区：
文献类型：
--
作者：
Xu, Qianjun;Zhang, Limin
本文从现场调查、室内试验、有限元分析和极限平衡分析等方面对某铁路线上降雨引起的滑坡进行了研究。研究的目的是确定故障的原因和失效机制，以防止此类故障的再次发生。该斜坡由3 ~ 4 m厚的裂隙粘土覆盖在高度风化的云母大理岩上，并与石英片岩互层。斜坡被切割成两级，由砖石护岸和薄薄的砖石挡土墙保护。该地区在9月份经历了整整一个月的小雨，之后在2004年10月5日的故障发生前5天出现了80毫米（48小时）的降雨。降雨入渗和挡土墙后排水系统失效，导致土体饱和度过高，最终导致不排水破坏。采用有限元法和极限平衡法对全应力参数下边坡的短期稳定性进行了分析。通过有限元分析和极限平衡分析得到边坡的安全系数分别为0.935和0.854，与破坏的发生一致。由于滑移发生在土岩界面上，因此岩石的暴露程度对其稳定性有重要影响。
This paper presents the study of a landslide induced by rainfall above a railway line in terms of site investigations, laboratory tests, finite element, and limit equilibrium analyses. The purpose of the study is to identify the cause and failure mechanism so as to prevent the recurrence of such failure. The slope concerned was composed of 3∼4 m thick fissured clay overlying highly weathered mica marble interbedded with quartz schist. The slope was cut into two steps and was protected by a masonry revetment and a thin masonry retaining wall at the toe. The region concerned suffered a whole month’s light drizzle in September, after which a rainfall of an intensity of 80 mm (in 48 h) occurred 5 days prior to the failure that happened on October 5, 2004. The rainfall infiltration and a failed drainage system behind the retaining wall resulted in high saturation of the clay and finally led to an undrained failure. The short-term slope stability using total stress parameters was examined by the finite element and limit equilibrium analyses. The factors of safety of the slope obtained by the finite element and limit equilibrium analysis were 0.935 and 0.854, which are in agreement with the occurrence of failure. Since the slide took place through the interface of the soil and rock, the exposure of rock has significant effect on the stability.