软岩路堤填料干湿循环大型压缩变形试验研究

Test and Study of Large Scale Compression Deformation Test for Soft Rock Filling under Dry Wet Cycles

为研究软岩路堤填料在气候环境作用下压缩变形特性的演化规律,针对贵州省三黎高速公路强~中风化板溪群板岩填料,开展了不同干湿循环次数条件下的大型压缩变形试验。试验结果表明:干湿循环会降低软岩填料的峰值压缩模量,但干湿循环3次和5次时其峰值压缩模量已十分接近,可认为当干湿循环达到5次时,峰值压缩模量趋于稳定;三黎高速公路强~中风化板溪群板岩路堤适宜填筑高度为20m,当路堤高度大于20m时,应采用冲击碾压或强夯等补强措施来提高路基压实度,增大填料压缩硬化区间范围,减少工后沉降变形量。另外,文中对软岩路堤填料的干湿循环大型压缩变形试验方法进行了探讨,可为同行提供参考。

In order to study the evolution rules of consolidation compression characteristics for the soft rock filling under climate environment,regarding to the heavy-medium weathered Banxi group slate filling for the Sansui-Liping Expressway in Guizhou Province,large consolidation compression tests are carried out under different wet dry cycles.Experimental results show that the dry wet cycle will reduce the peak compression modulus of soft rock filling,and the peak compression modulus is very close under 3 times and 5 times of dry wet cycles which indicates that when the dry wet cycle reaches 5 times,the peak compression modulus tends to be stable gradually;and the appropriate filling height for embankment of heavy-medium weathered Banxi group slate is 20 cm,when the embankment height is higher than 20 m,reinforcing measures of rolling compaction or dynamic compaction shall be taken to improve the compactness of subgrade and enlarge the compression and hardening range of fillers and reduce the settlement and deformation after construction.In addition,this paper discusses the methods of large scale consolidation compression test of dry wet cycle for soft rock filling which can provide reference for similar projects.