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连云港徐圩港区淤泥层深厚,土质条件差,拟在淤泥地基上修筑斜坡堤。准确开展筑堤后地基固结预测分析,可优化设计,并为港区后期建设提供技术支撑。采用能较好反映超软淤泥性质的修正剑桥模型,模拟斜坡堤分级施工过程,采用不同涂抹效应参数进行计算,通过与实测结果对比以确定海上排水板施工的合理涂抹参数。计算结果表明,当涂抹区井径比s=5,渗透系数降低比k_h/k_s=5时,原位监测结果与数值模拟结果吻合较好。要满足油气管廊基础对工后沉降的要求,应保障排水板施工质量,同时堤身预压时间不低于13个月。
Xuyi Port Lianyungang deep muddy silt, poor soil conditions, intended to build slopes in the muddy dike. Accurate prediction and analysis of foundation consolidation after embankment can optimize the design and provide technical support for the later construction of the port area. The modified Cambridge model, which can better reflect the properties of super-soft silt, was used to simulate the grading construction of slopes. The different grading parameters were used for the calculation. The reasonable application parameters for the construction of the sea drainage plate were determined by comparison with the measured results. The calculated results show that the in-situ monitoring results are in good agreement with the numerical results when the borehole diameter ratio s = 5 and the permeability coefficient decreases by k_h / k_s = 5. To meet the oil and gas pipe foundation settlement requirements after the construction, drainage pipe construction quality should be guaranteed, at the same time levee preloading time of not less than 13 months.