夹层型红黏土路基结构在高速公路中的研究

Research on Sandwich Subgrade Structure of Red Clay in Expressway

红黏土路基水稳定性较差,反复干湿作用易导致强度降低,引起路基的破坏。目前,在工程中主要采取改良红黏土、加强防排水措施、采用合理的施工工艺来提高红黏土路基整体质量和耐久性,很少考虑到红黏土路基的结构形式。为将红黏土直接作为路基填料,降低干湿循环对红黏土路基的影响,以蒙文砚高速公路红黏土路基试验段为例,提出了一种夹层型红黏土新型路基结构型式及其压实参数和施工工艺。

Red clay subgrade has so poor water stability that its strength may reduced easily under repeated wetting and drying action, leading to roadbed failure. Currently, the quality and durability of subgrade in red clay may be improved mainly by modifying red clay, strengthening waterproof and drainage measures and construction technology properly in the engineering, while the structure form thereof is taken into consideration rarely. To use red clay directly as subgrade filler and reduce the effect of wetting-drying cycle thereon, this paper took the red clay roadbed and the test section of Mengzi--Wenshan--Yanshan Highway as the example, and proposed a new type of sandwich subgrade structure of red clay with the compaction parameters and construction technology.