路基拓宽工程处治技术及其效果

Subgrade Treatment Techniques and Effects for Highway Widening

针对路基拓宽工程的常见病害及其成因机理,提出了“变形协调与控制”的处治技术思想,并依据路基拓宽不协调变形的不同组成部分,明确了相应的变形控制途径.通过有限元分析和室内模拟试验,对新老路基结合面处治、拓宽路基填料及压实度控制、路基加筋、轻质路堤、地基处理、支挡结构以及路基路面综合处治等七种技术的处治机理、效果和设计施工要点进行了分析.研究成果对路基拓宽工程中处治措施的选择、设计和施工具有重要的借鉴和指导意义.

Based on the investigation and mechanism analysis of distresses in subgrade widening engineerings, the technical treatment principle is determined as controlling uncoordinated deformation between widening subgrade and existing one. From the different resources of uncoordinated deformation, the corresponding techniques are proposed. On the basis of finite element analysis and laboratory test, seven kinds of treatment techniques and their effects are analyzed particularly, including interface disposal between existing and widening subgrades, controlling of filling and compaction, reinforcement, light weight embankment, foundation treatment, retaining structure and integrative treatment. The study may be useful to the selection, design and construction of subgrade treatments in highway widening engineering.