基于水泥搅拌桩技术的高速公路路基沉降控制研究  

Research on highway subgrade settlement control based on cement mixing pile technology

作　　者：刘鸿宇 LIU Hong-yu

机构地区：[1]中交中南工程局有限公司,湖南长沙410000

出　　处：《建筑机械》2025年第5期300-305,M0005,共7页Construction Machinery

摘　　要：文章为探讨水泥搅拌桩技术结合石灰和水泥改性在高速公路路基沉降控制中的应用效果,基于沅陵至辰溪高速公路的典型软土样品,设计并优化出4种改性配方,分别为纯石灰处理、纯水泥处理及2种石灰与水泥的混合处理方案。通过系统的室内试验,包括直接剪切试验、无侧限抗压强度试验和间接拉伸强度试验,研究不同改性配方对力学性能的影响,并在实际工程中进行水泥搅拌应用和现场载荷试验。研究结果表明,石灰与水泥的联合改性能够显著提升软土的力学性能,尤其是5%石灰与10%水泥的组合配方(5%SH+10%SN)在各项试验中表现最优。在350d养护期内,该配方的无侧限抗压强度达到7.8MPa,黏聚力为85.4kPa,内摩擦角为37.1°,表现出卓越的长期稳定性。现场沉降监测结果进一步验证了该配方的优越性能,其在90d内的总沉降量仅为27mm,显著低于未经处理的原状土(74mm)和单一水泥改性配方(39mm)的沉降量,表明其在软土路基沉降控制中具有显著的优势。The purpose of this study is to explore the application effect of cement mixing pile technology combined with lime and cement modification in the settlement control of expressway subgrade.Based on the typical soft soil samples of Yuanling-Chenxi expressway,this paper designs and optimizes four modifi ed formulations,which are pure lime treatment,pure cement treatment and two mixed treatment schemes of lime and cement.Through systematic laboratory tests,including direct shear test,unconfi ned compressive strength test and indirect tensile strength test,the infl uence of different modified formulations on mechanical properties was studied,and cement mixing application and fi eld load test were carried out in practical engineering.

关 键 词：水泥搅拌桩 软土路基 沉降控制 石灰改性 力学性能 

分 类 号：U416[交通运输工程—道路与铁道工程]