摘要
路基失稳变形会危害铁路运营安全。以怀邵衡铁路斜坡路基为工程背景,首先介绍路基病害的地形地貌、地质条件和地层岩性,再基于边坡失稳的内外因,对滑坡进行分区分析,研究边坡失稳机理与发展变化,开展边坡稳定性计算和评价,并提出安全可靠的治理方案。研究表明,路基本体及基床发生变形失稳,在路基本体内形成剪切滑面,路基失稳+坡脚反压荷载+基础土体扰动推移下部台地形成整个滑坡体,本体滑动带动下部滑动形成深层滑动。通过在路基本体坡面上施工钢管桩、钢花管注浆,以增加土体整体稳定性;同时坡脚挡墙顶部竖向增设预应力锚杆,以增强挡墙的抗滑及抗倾覆能力;通过在挡墙外缘增设钢筋混凝土桩板墙进行加固,防止土体失稳及发生深层滑动。该工程案例可为类似路基工程滑坡病害处置的设计与施工提供经验。
The deformation of the roadbed may pose significant risks to the operational safety of high-speed Railway.The Huaihua-Shaoyang-Hengyang Railway slope subgrade was taken as the example,landform,geological condition and stratigraphic lithology of the slope disease were introduced,based on the internal and external factors of the slope instability.The slope was analyzed by zoning,and the mechanism and development of slope instability were studied.Slope stability calculation and evaluation were carried out and a safe and reliable management scheme were put forward.The research results show that,the subgrade body and foundation bed are deformed and unstable.The shear slip surface is formed in the subgrade and the whole slope is formed,the embankment instability,slope foot pressure load and foundation soil disturbance push the lower platform and the deep slope is formed because the subgrade body drives the lower slope.The measures are taken for the slope including grouting of steel pipe pile and steel pipe for the slope embankment to improve the stability for the overall soil.At the same time,vertical prestressed anchor is added to the top of slope foot retaining wall to improve the anti-sliding and anti-overturning ability for the retaining wall.The landslide of subgrade can be treated with reinforcement adding reinforced concrete pile wall at the outer edge of retaining wall,the soil instability and deep sliding are prevented.This engineering case provides valuable insights and experience for the design and construction of similar roadbed projects facing landslide issues.
作者
冯登
FENG Deng(China Railway Siyuan Survey and Design Group Co.,Ltd.,Wuhan 430063,China)
出处
《铁道勘察》
2025年第4期103-110,共8页
Railway Investigation and Surveying
基金
中国铁建股份有限公司科技研发计划重点课题(2021-A02)。
关键词
铁路工程
路基
滑坡
变形特征
路基加固
railway engineering
roadbed
landslide
deformation characteristics
roadbed reinforcement
