吹填淤泥自重固结性质试验研究

发布时间：2018-04-22 10:13

本文选题：试验方法 + 沉积固结　；参考：《岩土工程学报》2017年03期

【摘要】：大变形自重固结理论可广泛应用于堆场设计和堆场吹填淤泥处理等方面,但对于沉积柱试验中淤泥的自重固结性质,尤其是非线性压缩关系和非线性渗透关系,并没有进行详细深入地研究。利用研制的沉积固结试验方法研究了太湖和白马湖吹填淤泥的自重固结性质。该方法由沉积柱、孔隙水压力测试装置和分层真空取样装置组成,利用该方法可得到淤泥自重固结过程中泥水界面、超静孔隙水压力、密度、有效应力、颗粒分布、压缩关系和渗透关系等参数的变化规律。压缩关系试验结果表明:两种淤泥压缩关系是非线性的。在较低的有效应力时随有效应力的增大孔隙比迅速减小,在较高的有效应力时随有效应力的增大孔隙比减小趋势趋缓。存在一个有效应力的分界点,低于此点不同时间时有效应力与孔隙比的关系较为分散,此时淤泥的压缩性很大,高于此点不同时间时有效应力与孔隙比的关系可认为是唯一的。两种淤泥渗透关系是非线性的。淤泥的非线性压缩关系和渗透关系可采用幂函数关系。
[Abstract]:The theory of self-gravity consolidation with large deformation can be widely used in the design of yard and the treatment of silt filling in the yard, but for the characteristics of self-gravity consolidation of silt in sediment column test, especially the nonlinear compression relation and nonlinear permeation relation. No detailed and in-depth study has been carried out. The self-weight consolidation properties of dredged silt in Taihu Lake and Baima Lake were studied by using the sedimentation consolidation test method developed in this paper. The method is composed of sedimentary column, pore water pressure test device and stratified vacuum sampling device. The mud water interface, excess pore water pressure, density, effective stress and particle distribution can be obtained by using this method during the process of self-consolidation of silt. The change rule of compression relation and permeability relation. The results of compression relation test show that the compression relationship of two kinds of silt is nonlinear. The void ratio decreases rapidly with the increase of effective stress at lower effective stress, and slows down with the increase of effective stress at higher effective stress. There is a dividing point of effective stress, and the relation between effective stress and void ratio is scattered at different time below this point. At this time, the compressibility of silt is very large, and the relation between effective stress and void ratio at different time is considered to be unique. The relationship between the two kinds of silt permeability is nonlinear. The nonlinear compression relation and permeability relation of silt can adopt power function relation.
【作者单位】：国家海洋局南海规划与环境研究院;重庆交通大学水利水运工程教育部重点实验室;南京水利科学研究院岩土工程研究所;河海大学环境学院;河海大学地球科学与工程学院;
【基金】：重庆交通大学国家内河航道整治工程技术研究中心暨水利水运工程教育部重点实验室开放基金项目(SLK2015B01) 国家自然科学基金项目(51209142;51278172)
【分类号】：TU41

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