高速公路改扩建工程滑坡成因分析及整治

Disaster prevention and control of geological landslide in reconstruction and extension project of expressway

工程滑坡灾害对工程建设和生产生活等都带来极大危害,本文对福建省高速公路改扩建工程龙岩段某工程滑坡进行详细勘察,分析滑坡段工程地质特征、滑坡形成及滑动机理,对滑坡稳定性进行计算分析,查明滑坡稳定性及其对道路的影响程度,得出不同状态下滑坡体的稳定系数及剩余滑动力,并根据滑坡体与设计路线的关系,提出了滑坡体内和周界外设置截排水沟,拦截地表水、疏导地下水、清除坡体裂隙岩土体,放坡减载、在坡体中下部路基外侧设置抗滑挡土墙等综合防治方案,通过工程滑坡治理方案实施和现场监测成果,证明工程滑坡的稳定性分析与地质灾害防治方案合理有效,将为今后类似工程滑坡的稳定性分析与灾害防治提供借鉴。

Landslide hazards have brought great losses in engineering construction and daily life.Detailed surveys have been conducted to the area of landslide in Longyan section range of Fujian reconstruction and extension project of expressway.All the works included analysis of engineering geological characteristics,landslide formation and sliding mechanism of the landslide section,calculation of the stability of the landslide and its influence on the road,and results of the stability coefficient and residual sliding force of the landslide body under different conditions.According to the relationship between the landslide body and the design route,some comprehensive disaster prevention methods are put forward,such as setting up drainage ditches inside and outside the landslide body,intercepting surface water,dredging groundwater,clearing fissure rock and soil of the slope,reducing load on the slope,setting anti-sliding retaining walls or piles in the subgrade,etc.Based on the results of field monitoring and testing,the ways of investigation,analysis and treatment of landslide geological hazards are proved to be reasonable and effective,which can provide reference of engineering investigation,stability analysis and disaster prevention for similar landslide in the future.