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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 law of compressive deformation of soft rock embankment packing under climatic envirionment, a large scale compressive deformation test under different wetting and drying cycles was carried out according to the strong-moderately weathered Banxi group slate filling in Sanli Expressway in Guizhou Province . The experimental results show that the wetting and drying cycles will reduce the peak compressive modulus of soft packings, but the peak compressive modulus of the soft packings is very close to that of the third and fifth wet-dry cycles. It can be concluded that when the wet-dry cycle reaches five times, The modulus tends to be stable; the suitable filling height of slate embankment of Banxi group in Sanli Expressway is 20m; when the height of embankment is more than 20m, reinforcement measures such as impact rolling or dynamic compaction should be adopted to improve subgrade pressure Real degree, increase the range of compression hardening range, reduce the amount of post-construction settlement. In addition, the large-scale compression deformation test method of soft rock embankment packing in wet-dry cycle was discussed in this paper, which can provide reference for peers.