围海造陆工程泄水口吹填土流失现场观测研究

发布时间：2018-06-08 05:43

本文选题：吹填土流失 + 现场观测　；参考：《泥沙研究》2014年02期

【摘要】：围海造陆工程泄水口吹填土流失不仅影响周边海域生态环境,而且降低企业效益。选取天津市南港吹填造陆工程为观测对象,探索与流失量相关因素之间的关系。吹填土以淤泥、淤泥质土、粉质粘土为主。现场观测主要包括吹填量、泄水口的流速、过水断面面积、浓度、流失量以及闸箱式泄水口的挡板上过水厚度。结果表明在吹填施工的中后期疏浚泥浆通过泄水口的流失率相当严重,流失土的颗粒平均粒径均较小。日吹填量不是影响流失量和流失率的主要因素,流失率对闸箱式泄水口的挡板顶标高的变化较为敏感,适时的增大泄水口的挡板顶标高,延长水力停留时间,提高泥沙落淤沉降效率,能显著降低流失率。
[Abstract]:The loss of draught fill not only affects the ecological environment of the surrounding sea area, but also reduces the benefit of the enterprise. The Nangang reclamation project in Tianjin was selected as the observation object to explore the relationship between the factors related to the loss. The main filling soil is silt, silt clay. The field observation mainly includes the filling volume, the velocity of the outlet, the area of the cross section, the concentration, the amount of loss and the thickness of the baffle of the sluice box outlet. The results show that the loss rate of dredged mud through the outlet is very serious and the average particle size of the soil is smaller in the middle and late stage of dredging construction. The amount of daily air filling is not the main factor that affects the loss and the rate of loss. The loss rate is sensitive to the change of the top standard height of the baffle of the sluice box outlet, and increases the top height of the baffle in time and prolongs the hydraulic retention time. The loss rate can be significantly reduced by increasing the efficiency of sediment deposition.
【作者单位】：长沙理工大学水利工程学院;中交天津航道局有限公司;水沙科学与水灾害防治湖南省重点实验室;
【基金】：国家自然科学基金重点项目(51239001);国家自然科学基金项目(51179015) 高等学校博士学科点专项科研基金新教师类资助课题(20124316120003) 天津市科技兴海行动计划(KJXH2011-12)
【分类号】：S157;U652

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