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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三轴压缩试验。试验结果表明:干湿循环效应对于板岩填料的抗剪强度参数影响是较为显著的,特别是首次干湿循环后,抗剪强度参数有明显的变化,而当干湿循环次数进一步增加时,强度仍有变化,但较第一次弱;板岩填料的黏聚力c值随干湿循环次数增多近似呈线性增长,内摩擦角φ值随干湿循环次数增多近似呈幂函数减小;首次干湿循环后,内摩擦角φ值下降约7%,黏聚力上升约26%,但总体抗剪强度仅有约2%~7%的下降,说明干湿循环效应对强—中风化板溪群板岩路堤边坡稳定性影响不大。另外,本文对板岩路堤填料的干湿循环大型三轴压缩试验条件和方法进行了探讨,可为同行提供参考。
Aiming at the stencil packing of strong-moderately weathered Banxi group in Sanli Expressway in Guizhou Province, a large-scale triaxial compression test under different conditions of wet-dry cycles was carried out. The experimental results show that the effect of the wetting and drying cycle on the shear strength parameters of slate filler is significant, especially after the first wetting and drying cycles. However, when the number of wetting and drying cycles is further increased, But the strength is still weaker than that of the first time. The cohesion value of slate filler increases linearly with the increase of the number of wet and dry cycles. The φ value of internal friction angle decreases with the increase of the number of wet and dry cycles, After the first wet-dry cycle, the internal friction angle φ decreased by about 7% and the cohesion increased by about 26%, but the overall shear strength decreased by only about 2% -7%, indicating that the effect of wet-dry cycling on strong- Banxi group slate embankment slope stability has little effect. In addition, this paper discusses the conditions and methods of large-scale triaxial compression tests of slate embankment packing in wet-dry cycle, which can provide reference for peers.