山区公路软基病害研究

Study of diseases in the soft foundation of highway in mountainous area

随着高等级公路建设规模的扩大,山区公路所面临的路基病害特别是软土路基病害问题也逐渐增多。结合对陕南勉(县)—宁(强)高速公路工程实例分析,对山区软土成因及其特性进行了初步分析,认为山区软土属以坡洪积、湖积和冲积为主的软土,也有少量是由坡残积物堆积而形成。山区软土的特殊性表现在成分的复杂性、分布的不均匀性、隐蔽性和物理力学性质的特殊性。根据其特性以及中国山区公路软基普遍存在的病害问题,总结了山区公路软基的主要病害类型为剪切拉裂破坏、浸水沉陷破坏、剥蚀坍塌破坏、推挤滑动破坏。还提出了相应的软基处理方法及建议。

With the development of highway construction in mountainous area, more and more diseases in the soft foundation is suffered. By researching into the Mianxian-Ningqiang highway in south Shaanxi Province, the origin and characteristics of soft soils in mountainous area is probed. It is found that most of the soft soils in mountainous area belongs to deposits of alluvial and lake. The specialty of soft soils in mountainous area is the complexity of composition, inhomogeneous and hidden distribution and the specialty of physical and mechanical properties. The types of diseases in soft foundation in mountainous area are summarized as shear and tension fracturing, subsidence due to water permeating failure, erosion and collapse failure and pushing and sliding failure. Meanwhile, the suggestions of treatment measures for the soft foundation are given.