泥砂淤积过程中淤积量及强度变化试验研究

发布时间：2018-04-11 02:06

本文选题：沉降柱 + 泥沙淤积　；参考：《科学技术与工程》2017年07期

【摘要】：采用常规有机玻璃沉降柱试验系统针对泥砂淤积过程中淤积量以及强度的变化进行了一系列的室内实验。通过记录浊液面高度随时间变化得到不同浓度、不同级配泥砂的沉降曲线;并运用SNJ-1型微型十字板剪切仪分层测取沉积淤泥的强度。对沉积泥砂在沉积过程中淤积量以及强度变化进行分析,得到结论:泥沙淤积量随泥沙浓度、时间的变大而变大;但沉积速率随着泥沙的浓度的变大而减小。淤积泥沙的剪切强度随着深度的增加、时间的延长、浓度的增加、粗颗粒含量的增加而增大;且泥沙浓度越大,强度随时间增长的趋势越不稳定。根据实验数据拟合得到淤积泥沙强度与相对深度之间呈线性关系,并得出系数与时间之间也呈线性关系。
[Abstract]:A series of laboratory experiments were carried out on the change of silt quantity and strength during silting process by using the conventional test system of PMMA settling column.The sedimentation curves of different concentration and different gradation of mud sand were obtained by recording the change of liquid surface height with time, and the strength of sedimentary silt was measured by SNJ-1 mini cross plate shear meter.Based on the analysis of the change of sedimentation amount and strength of sediment sand in the process of sedimentation, it is concluded that the amount of sediment deposition increases with the increase of sediment concentration and time, but the deposition rate decreases with the increase of sediment concentration.The shear strength of silt increases with the increase of depth, time, concentration and coarse particle content, and the increasing of sediment concentration is more unstable.According to the experimental data fitting, the linear relationship between sediment intensity and relative depth is obtained, and the linear relationship between coefficient and time is also obtained.
【作者单位】：河海大学岩土力学与堤坝工程教育部重点实验室;河海大学江苏省岩土工程技术研究中心;中冶北方(
【分类号】：TV149

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