公路桥涵台背回填材料研究现状综述

为了减少公路桥涵台背回填病害,对台背回填材料和主要处理措施的研究现状进行了总结和评价。从构造差异、地基沉降、回填材料的压缩变形等方面分析了台背回填病害的主要原因,对常用工程措施及其效果进行了总结,包括桥头搭板、地基处理、反开挖填贫混凝土和压密注浆等,对石灰土、砂砾、风积砂、陶粒粉煤灰混凝土、泡沫混凝土、土工格栅、土工格室加筋体、EPS夹层等常用台背回填材料的性能及其效果进行了比较与评价。研究认为台背回填材料的选取应该就地取材,采用新技术对现有材料进行加筋和改性,建议重点研究EPS夹层与格栅加筋的综合运用技术和新型轻质回填材料的开发与应用技术,有效预防桥头跳车病害的发生,提高公路使用性能。

Study actuality summary of backfilling materials behind abutments of highway bridge and culvert

In order to reduce backfilling diseases behind abutments of highway bridge and culvert,the study actualities of backfilling materials and technologies were summarized.Firstly,the main reasons of backfilling diseases were studied from the aspects of abutment construction differences,subsoil settlements and the compression distortions of backfilling materials.Secondly,general backfilling engineering measures and effects were analyzed,such as bridge end transition slab,subsoil treatment,lean concrete backfilling and back-digging,compact grouting and so on.Thirdly,the properties and effects of common backfilling materials were compared,such as lime-soil,sand gravel,neolian sand,argil fly-ash concrete,foamed concrete,geogrid and geosell reinforcement and EPS.Study result shows that local materials should be used in abutment backfilling engineering,existing backfilling materials should be improved and strengthened by new technologies,and it is suggested that the integrated applying technology of EPS interlayer and geogrid reinforcement should be studied,light-weight backfilling materials should be empoldered,so that the bridgehead-jumping disease is prevented,and highway using performance is improved.2 figs,32 refs.