高液限土路基的沉降变形规律

高液限土具有高天然含水率、高塑性、高孔隙比和低压实度的特点。明确高液限土路基的沉降变形规律成为其科学合理利用的关键。为此，在明确高液限土路用特性的基础上，铺筑了1条26.5 m高的高液限土高填方路基试验段，并进行了长期的沉降观测。结果表明，高液限土路基填筑期间的压缩变形量很大，填筑完成后自然沉降稳定期的固结变形量较小，路面铺筑后的工后沉降量很小，约为高度的2‰；高液限土路基的沉降量与其竖向填筑厚度基本成正比。采用简化的非饱和土固结理论对高液限土路基的沉降变形进行了模拟计算，计算结果与高液限土路基的实测沉降量基本一致，说明非饱和土固结理论可用于高液限土路基的沉降计算。高液限土路基沉降变形规律的成果说明其工后沉降不会过大，为其在公路工程中的推广应用提供了技术依据。

Settlement law of high liquid limit soil embankment

High liquid limit soil has some characteristics such as high natural moisture content, high plasticity, high void ratio, and low compactness. Finding the settlement deformation law of high liquid limit soil embankment becomes the key to use it scientifically and reasonably. Based on the mechanical properties of high liquid limit soil, a 26.5 m high embankment was constructed using high liquid limit soil and a long-term settlement observation was carried out. Observation results show that the road settlement value is very high during the subgrade construction; the settlement is smaller in the natural sedimentation time; and the settlement is very small after the pavement construction, about 0.2% of the height. The settlement value is proportional to the subgrade height. Adopting simplified unsaturated soil consolidation theory, the settlement and deformation of high liquid limit soil have been calculated; the calculation results is basically identical with the measured settlement of high liquid limit soil embankment, consolidation theory of unsaturated soil provides a new technical mean for high liquid limit soil embankment settlement calculation. The results prove the post-construction settlement of high liquid limit soil will not be larger; so as to provide a technical basis for its popularization and application in highway engineering.