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鸡爪沟地形容易造成上部路基变形失稳、不均匀沉降,尤其在其上部修筑高填石路堤,其稳定性问题更加突出,目前尚无这方面研究成果。依托某山区高速公路建设项目,开展有限元计算,重点分析鸡爪沟高填石路堤的稳定性与不同加固技术应用效果。研究发现:此类路基位移变形大于一般路堤,应加强设计验算并采取相应的施工措施;鸡爪沟地基坡度、路堤宽度、路堤高度等指标改变,将引起路肩、坡脚位移明显变化,并显著改变路堤内部应力分布,而边坡坡率在要求以内变化,对路堤变形与应力影响不大。分析挖台阶法、加筋、注浆、强夯等工程措施的适用性与经济性,考虑经济性选取挖台阶法对高填路堤进行加固处理,计算结果表明此方法确保路堤边坡安全系数满足稳定性要求,建议采用此种方法对路堤进行加固。
The chicken claw trench terrain can easily lead to instability and uneven settlement of the upper embankment, especially in the upper part of the high embankment embankment, the stability of the more prominent problems, there is no research in this area. Relying on a mountain highway construction project, carry out finite element analysis, focusing on the analysis of the stability of the high embankment at Jikougou and the effect of different reinforcement techniques. The results show that the deformation of such subgrade is greater than that of normal embankment, and the design verification and corresponding construction measures should be strengthened. The change of indexes such as slope, embankment width and embankment height of Jigougou foundation will cause obvious change of shoulder displacement Changes in the internal stress distribution of the embankment, while the slope gradient changes within the requirements of the embankment deformation and stress has little effect. The applicability and economy of engineering measures such as excavation step, reinforcement, grouting and dynamic compaction are analyzed, and the embankment reinforcement with high embankment is selected considering the economy, and the calculation results show that this method can ensure that the safety factor of embankment slope satisfies Stability requirements, it is recommended to use this method to reinforce the embankment.