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堤防的沉降和稳定问题是软土地基上新建堤防工程必须考虑的重要问题。结合南京市长江干堤提升工程小年圩新筑堤项目,开展了软土地基上新建堤防施工全过程的现场监测与分析,主要包括表层沉降、分层沉降、土体侧向位移、土压力、孔隙水压力以及地下水位等内容。基于Plaxis有限元数值软件,建立了软土地基上新建堤防施工填筑过程的数值模型,通过与现场监测结果的对比分析,验证了所建立的数值模型的准确性和可靠性;续而重点分析了填筑速率、填筑间歇时间等关键性施工控制指标对软基上堤防沉降的影响规律。研究结果表明,当单次填筑厚度小于1m时,单次填筑厚度对整体沉降的影响较小,因此结合实际施工要求,建议单次填土厚度为0.5~1.0 m。相关研究成果可以为类似软基上新建堤防施工质量控制提供参考依据。
The settlement and stabilization of embankments is an important issue that must be considered in the construction of new embankments on soft ground. Combined with the new levee project of XiaoYinWei of Yangtze River Dry Embankment Enhancement Project in Nanjing City, the on-site monitoring and analysis of the whole process of new embankment construction on soft soil foundation are carried out, including surface subsidence, stratified settlement, lateral displacement of soil, earth pressure , Pore water pressure and groundwater level and so on. Based on the Plaxis finite element software, the numerical model of the construction of new dykes on the soft soil foundation was built. The accuracy and reliability of the established numerical model were verified by comparison with the field monitoring results. The effects of key construction control indexes such as filling rate and filling intermittent time on embankment settlement on soft foundation were studied. The results show that when the single fill thickness is less than 1m, the single fill thickness has little effect on the overall settlement. Therefore, considering the actual construction requirements, it is recommended that the single fill thickness is 0.5 ~ 1.0m. The related research results can provide reference for the quality control of newly built dikes on similar soft foundations.