The unclear understanding of the mechanical behavior of soil under unloading conditions is a significant reason for the frequent occurrence of accidents and difficulties in the deformation control of foundation pit engineering in coastal areas. This paper discusses the effect of multistage unloading intensity on the mechanical properties of reconstituted coastal soils containing silty particles through a series of laboratory tests, namely, the CU triaxial, bender-element, and permeability tests. Results indicate that, with an increase in unloading intensity, the shear strength and stiffness parameters decrease, while permeability slightly increases. The effect of unloading intensity on the mechanical properties of silt and mucky silty clay is more pronounced. Additional consideration should be given to the effect of a single excavation depth on the mechanical properties of fine-grained soil in foundation pit engineering in order to ensure the stability of the surrounding soil and the safety of adjacent structures.
The stress disturbance induced by adjacent construction has a significant impact on the dynamic characteristics of the soil, resulting in complex long-term tunnel settlement under train vibration load. Through a series of dynamic triaxial tests, the effects of different fine particle contents and axial unloading intensities on the permanent axial deformation and excess pore water pressure of reconstituted silt under long-term cyclic loading were investigated. The findings show that as fine particle content in the silt increases, the threshold dynamic stress and failure cycle number decrease at first, then increase, reaching a minimum value at 10% fine particle content. The dynamic characteristics of silt are significantly affected by axial unloading, and the dynamic stress threshold amplitude of a soil sample decreases as the unloading strength increases. The accumulation of silt deformation caused by long-term cyclic load can be effectively controlled by ensuring drainage conditions.
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