安岳县横庙乡牛厂村滑坡、崩塌双重灾害的特征分析与评价

Characteristics and Evaluation of the Landslide in Niuchang Village,Hengmiao Township,Anyue County

本文在安岳县横庙乡牛厂村滑坡野外勘查成果基础上,结合样品试验数据,对该滑坡的特征、形成机制以及稳定性进行了综合评价。结果表明:牛厂村滑坡为第四系残坡积土体沿与下伏侏罗系遂宁组紫红色泥岩、砂岩接触面向下滑动的小型牵引式土质滑坡。滑体物质成分主要为含碎石粉质黏土,结构较松散,自身稳定性较差,加之强降雨及地表水下渗,同时受人类工程活动在滑坡体前缘形成了临空界面,使前缘降低斜坡抗滑力,后缘增加斜坡下滑力,最终发生了滑坡迹象。在天然工况下趋于基本稳定状态,在强降雨或持续降雨等不利条件作用下趋于欠稳定状态,暴雨工况下更易失稳。建议对牛厂村滑坡采取“桩板墙+排水沟+地面硬化+危岩清危”对地质灾害进行工程治理。

This paper has a discussion on characteristics and stability of the landslide in Niuchang Village,Hengmiao Township,Anyue County on the basis of field investigation in combination with laboratory analyses.The landslide is a small traction soil one of the Quaternary outwash sliding along the contact plane with the underlain Jurassic Suining Formation.Consisting of loose silty clay with broken stone,the sliding mass is unstable.Heavy rainfall and human engineering activities contributed to the landslide.The landslide tends to the basic stable state under the natural working condition,but tends to be less stable under the condition of heavy rain or continuous rain.Sheet-pile walls,discharge gutters,hardening ground and removing dangerous rock should be used for controlling the landslide.