顺层滑坡的发育环境及分布特征

Development environment and distribution characteristics of bedding plane landslides

顺层坡是山区铁路、公路和水利水电工程建设中常见的一类斜坡,也是极易失稳滑动的一类斜坡,其稳定性及其影响因素一直是工程技术人员关心的问题。在现场勘测和调查的基础上,对涪陵市至酉阳县龙潭镇渝怀铁路沿线顺层滑坡的发育环境及其分布特征进行了系统的统计分析,结果表明:岩层中的软弱夹层、构造变动时形成的层间错动面及因河流切割而形成的有效临空面是顺层滑坡发育的基本条件;暴雨是斜坡滑动的重要诱发因素;滑坡发育程度随坡高的增大而增大,随岩层走向与斜坡临空面走向间夹角的增大而减小,同时具有凸形坡大于直线坡而直线坡大于凹形坡的规律。

Bedding plane slope is encountered frequently in construction of railway, highway and hydroelectric station and water conservancy projects in the mountain area, and is the easily sliding one. The stability of the slope and its influence factors are concerned by engineers. There are many bedding plane landslides between Fuling City to Longtan Town along the Chongqing-Huaihua Railway.Based on the comprehensive investigations and in-situ surveys to these landslides,statistical analysis for the development environment and distribution characteristics has been carried out. The weak seam of slope rock mass and the mini-slip plane between the rock beddings formed by geological processes and the effective slip spaces formed by river eroding actions are the basic factors of slopes sliding along the bedding plane.The development degree of landslide increases as the height of the slope does and decreases as the angle between the direction of strata and slope surface increases and has a law that the development degree of the landslide of the linear slope is higher than that of the concave one, and the convex one is the highest of the three.