四川峨眉山市王山-抓口寺滑坡滑带工程地质特征研究

Research on engineering geology characteristics of Wangshan-Zhuakousi landslide in sliding zone in Emeishan city

本文在滑坡地质特征现场调查的基础上,结合室内试验,对峨眉山市王山-抓口寺滑坡滑带土颗粒成分、矿物成分、微观结构、物理力学特征及降雨对滑坡稳定性的影响等进行了研究。结果表明,凝灰岩夹层是滑坡体形成的主要物质基础,滑带土主要成分为粉质黏土,滑带土具有明显的深层蠕滑磨光面和擦痕迹象;滑带土为粉质黏土,黏粒含量高,透水性弱,含有大量的蒙脱石,易水软化,因降雨引起滑带土饱水,其力学强度急剧降低,是滑坡发生高速滑动的主要诱发因素。

The article based on the onsite survey on the geological characteristics of landslide, with indoor experiment has researched the grain components, mineral composition, micro structure, physical mechanics property of the Wangshan-Zhuakou Temp landslide in Emeishan City, and analyzed the effect of rainfall to landslide stability. Results shows that tuff interlayers is the main material basis of landslide formation, and the main components of soil in the sliding zone is silty clay. The soil in sliding zone has obvious deep creep polished surface and signs of scratches. Silty clay has a high content of clay and weak permeability with a lot of clay mineral such as montmorillonite which is easy to be softened after absorbing water. Sharp decrease in mechanical strength, and it is the main inducing factor for a moving landslide.