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贵州六威高速公路某路基边坡在施工过程中发生了滑塌。经过现场踏勘及地质调绘、钻探、挖深后发现,该段滑坡的产生由路堑开挖使炭质页岩出露于地表而加速风化、赋水、软化,在路堑坡脚处顺层滑动剪出而形成。滑坡土体基本由碎石粘土与强风化炭质页岩构成,滑床为炭质页岩强风化层面。通过不同条件下的坡体稳定性计算验证了此边坡处于不稳定状态。比选了削坡加挡墙及抗滑桩2种处治措施,得出了抗滑桩为最优方案的结论。
A slippery slope occurred during the construction of a subgrade slope of Guizhou Liuwei Expressway. After on-site reconnaissance and geological mapping, drilling and excavation, it was found that the landslide occurred in this section is exposed to the earth surface by excavation of cuttings to speed up weathering, watering and softening, sliding along the foot of the cutting slope Out to form. The landslide soil is basically composed of gravel clay and strong weathered carbonaceous shale, and the sliding bed is a strong weathered layer of carbonaceous shale. The stability of the slope under different conditions is verified by the instability of the slope. Compared with two kinds of treatment measures, such as cutting slope, adding retaining wall and anti-slide pile, the conclusion that anti-slide pile is the optimal plan was obtained.