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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。
The theory of large deformation self-weight consolidation can be widely applied to the design of storage yards and silt treatment in the dump, but the self-weight consolidation properties of the sludge in the depositional column test, especially the nonlinear compression relationship and the nonlinear permeability relationship, have not been carried out. Detailed and in-depth study. Using the developed sediment consolidation test method, the self-heavy consolidation properties of dredging mud in Taihu Lake and Baima Lake were studied. The method is composed of a deposition column, a pore water pressure testing device and a layered vacuum sampling device. By using this method, the sludge-water interface, excess pore water pressure, density, effective stress, particle distribution, and compression relationship during consolidation of the sludge can be obtained. Infiltration relationship and other parameters of the law of change. The compression relationship test results show that the relationship between the two silt compressions is nonlinear. At lower effective stress, the void ratio decreases rapidly with the increase of effective stress. With higher effective stress, the decrease of void ratio tends to decrease with the increase of effective stress. There is a demarcation point of effective stress. Below this point, the relationship between effective stress and void ratio is more dispersed. In this case, the compressibility of the sludge is very large. The relationship between the effective stress and the void ratio above this point at different times can be considered only one. The relationship between the two types of sludge penetration is nonlinear. The nonlinear compression relationship and permeation relationship of sludge can use power function relationship.