山区高速公路古滑坡复活成因机理与处治措施研究

Cause Mechanism and Treatment Measures of Ancient Landslide Resurrection on Mountainous Expressways

古滑坡复活现象是山区高速公路建设和安全运营所面临的一大难题。选取岢临高速K174+850王家墕古滑坡为例,探讨了山区高速公路古滑坡复活的成因机理。研究发现,降雨是古滑坡复活的主要诱因,地下水位的上升导致土壤抗剪强度减少,增加了古滑坡复活的风险。在山区高速公路古滑坡治理过程中,应当充分考虑高速公路全寿命周期内的环境工况,将可能出现的影响因素前置设计,确保运营期高速公路的安全通行。同时针对水分入渗导致的复活古滑坡,应充分考虑湿软路基的加固以及支护形式的选取。

The ancient landslide resurrection is a vital difficulty faced by mountainous expressway construction and safety operations.Taking the Wangjiayan ancient landslide on K174+850 of Kelin Expressway as an example,this paper discusses the cause mechanism of the ancient landslide resurrection on mountainous expressways.It is found that rainfall is the main factor causing the ancient landslide resurrection,which means,the rise in the underground water level causes the soil to reduce its shear strength,increasing the risk of ancient landslide resurrection.So in the treatment of the ancient landslide on mountainous expressways,the environmental conditions should be fully considered in the full expressway life cycle,and possible influencing factors should be designed in advance to ensure safe traffic of the expressway during the operation period.Meanwhile,for the ancient landslide resurrection caused by water infiltration,the reinforcement of wet soft subgrades and the selection of support form should be comprehensively considered.