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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。
High liquid limit soil has the characteristics of high natural moisture content, high plasticity, high void ratio and low compaction. It is the key of scientific and reasonable utilization to clarify the law of settlement and deformation of high liquid limit soil subgrade. Therefore, on the basis of clarifying the characteristics of high-liquid-limit soil track, a 26.5 m high liquid-filled high embankment embankment section was paved and long-term settlement observation was carried out. The results show that the compressive deformation during the filling of high liquidity soil subgrade is very large, the consolidation deformation of the natural settlement stability period after the completion of filling is small, and the post-construction settlement after road pavement is very small, about high 2 ‰; the settlement of high liquid limit soil subgrade is basically proportional to the vertical filling thickness. The simplified unsaturated soil consolidation theory is used to simulate the settlement deformation of high liquid-limit soil subgrade, and the calculated results are basically consistent with the actual subsidence of high-liquid-limit soil subgrade, indicating that unsaturated soil consolidation theory can be used in high liquid limit Subgrade settlement calculation. The result of settlement regulation of high liquid limit soil embankment shows that the post-construction settlement will not be too large, which provides a technical basis for its popularization and application in highway engineering.