黄土铁路路堤滑坡破坏机制与防治技术研究  

Research on the Failure Mechanism and Prevention Technology of Loess Railway Embankment Landslide

作　　者：范家玮 张玉芳 周文皎 FAN Jiawei;ZHANG Yufang;ZHOU Wenjiao(Railway Engineering Research Institute,China Academy of Railway Sciences Co.Ltd,Beijing 100081,China;National Key Laboratory of High-Speed Railway Track System,Beijing 100081,China)

机构地区：[1]中国铁道科学研究院集团有限公司铁道建筑研究所,北京100081 [2]高速铁路轨道系统全国重点实验室,北京100081

出　　处：《防灾减灾工程学报》2024年第4期772-783,共12页Journal of Disaster Prevention and Mitigation Engineering

基　　金：中国国家铁路集团有限公司科技研究开发计划(N2022G020);中国铁道科学研究院集团有限公司基金项目(2022YJ333);青海省重点研发与转化计划(2022-SF-158)资助。

摘　　要：2021年7月20日,河南省遭遇极端暴雨,诱发大量路基水害。通过对路基水害开展现场调查,查明了水害发生区间内区域地形地貌及水文地质条件,提出了黄土路堤滑坡破坏模式,并结合数值模拟分析路堤滑坡的破坏机制。运用多次分段控制注浆钢花管的防治技术对路堤边坡进行整治,采用挖探调查、高密度电法的手段探究钢花管加固黄土路堤的注浆效果,并结合数值模拟分析注浆加固前后黄土路堤边坡的稳定性。研究结果表明:(1)路堤滑坡不同于路堤浅表层溜坍的坡面病害,是一种严重的坡体病害,常由于坡脚地形低洼,降水在路堤边坡坡脚或下部汇集,浸泡软化路堤边坡,引起边坡岩土抗剪强度不足导致滑坡;(2)数值模拟结果表明坡脚积水深度对路堤边坡的竖向应力场无明显影响,对积水侧边坡的水平应力场与位移场影响显著;随着积水深度增大,路堤边坡最大剪应变的最值增大,稳定系数减小;(3)挖探调查与高密度电法探测结果表明钢花管注浆技术在黄土地层劈裂注浆效果良好,黄土边坡内部孔隙被水泥浆体充填,隔绝了坡体内部的流水通道,抑制坡体内部受水侵蚀;(4)钢花管注浆加固后数值模拟结果表明,整治加固后路堤稳定性显著提升。研究成果为铁路系统工务部门的水害防治工作提供参考。On July 20,2021,Henan Province experienced an extreme rainstorm,triggering numerous subgrade water damage incidents.Through on-site investigations of subgrade water damage,the re-gional topography,geomorphology,and hydrogeological conditions within the affected area were iden-tified.A failure mode for loess embankment landslide was proposed,and the failure mechanism of the embankment landslide was analyzed through numerical simulations.The prevention technology of mul-tiple segmented control grouting with perforated steel pipes was used to stabilize the embankment slope.Excavation investigations and high-density electrical methods were used to explore the grouting effectiveness of perforated steel pipes in reinforcing the loess embankment,and numerical simulations were used to analyze the stability of the loess embankment slopes before and after grouting reinforce-ment.The research results indicate that:(1)Embankment landslides differ from superficial slope sur-face slides,often caused by low-lying terrain at the slope foot where precipitation accumulates at the foot or lower part of the embankment slope,soaking and softening the embankment slope,resulting in insufficient shear strength of the slope and causing landslides.(2)The numerical simulation results indi-cate that the depth of accumulated water at the slope foot has no significant effect on the vertical stress field of the embankment slope but significantly impacts the horizontal stress field and displacement field of the side slope with accumulated water.As the depth of accumulated water increases,the maxi-mum shear strain value of the embankment slope increases,and the stability coefficient decreases.(3)Excavation investigation and high-density electrical method results indicate that the perforated steel pipe grouting technology achieves good splitting grouting results in the loess strata,filling the internal pores of the loess slope with cement slurry,thereby isolating the internal water flow channels and sup-pressing internal water erosion.(4)The nume

关 键 词：路基 铁路水害 路堤滑坡 破坏机制 防治技术 

分 类 号：U216.41[交通运输工程—道路与铁道工程]