Experimental Study On Compression-Permeability Behaviour Of Clayey Slurries Under Self-Weight

Large amounts of dredged mud produced by inland dredging activities are usually handled by yard storage.The method of quickly eliminating the surface water of the yard and the free water in the mud during the dredging process can greatly improve the storage capacity of the dredged mud in the yard.The key scientific problem is the compression-permeability of clayey slurries under selfweight.In this paper,thirty-one sets of self-weight drainage model tests of five different clayey slurries with different initial water contents were carried out by using the self-weight drainage model test device and the compression-permeability behaviour of was discussed.The main works and results of this paper are as follows:(1)The variations of the total quantity of drainage and water contents of the specimens with drainage time are studied.The effects of liquid limit and initial water contents on the deformation of clayey slurries are analyzed.(2)The changes of void ratio with drainage time are analyzed during the self-weight drainage tests.The relationships between the void ratio and the low effective stress at different positions of the self-weight drainage model test device are discussed after the self-weight drainage deposition in order to study the compression behavior at low stress levels.(3)Using the calculation method of permeability coefficient proposed by Been to study the permeability behaviour of the clayey slurries during the self-weight drainage test.The influence of initial water contents and liquid limit on the permeability coefficient are analyzed.(4)After the self-weight drainage deposition,sixty-nine groups of particle size distribution tests are carried out on specimens at different positions in the self-weight drainage test device.The separations of particle size during the self-weight drainage tests are studied.