Study on the effect of samplers on the disturbance of dredger-filled soil structure by numerical simulation layering method

¹ School of Earth Sciences and Engineering, Sun Yat-Sen University, Guangzhou 510275, China
² Guangdong Provincial Key Lab of Geodynamics and Geohazards, Guangzhou 510275, China
³ Guangdong Provincial Key Laboratory of Geological Processes and Mineral Resource Exploration, Guangzhou 510275, China

^* Corresponding author: songj5@mail.sysu.edu.cn

Abstract

Through the use of the particle flow software simulation, the influences on the microscopic dynamic properties of high viscosity soft soil caused by the inner diameter, cut angle and wall thickness of the samplers were studied with the example of the dredged mud. The motion behavior of the inflection point of particle characteristics was compared in seven soil samples by dividing the soil layers. The results show that a convective displacement field of the soil particles is formed at the bottom, and the particles above the convection are mainly subject to tensile expansion while the particles below the convection are mainly compressed and contracted, which result in the regular changes in porosity and bending deformation of the soil layers. There is a synergistic relationship between the intersection of the porosity curve and the initial porosity curve and the convective position of the particle displacement field. There is a characteristic inflection point in the interlayer particle displacement with the soil layers behave as a bending deformation. The particle disturbance between the inflection points is not obvious and the particle disturbance outside the inflection points is larger. The deformation feature can be fitted to a rotating paraboloid with the lower opening and the disturbance of the seven groups soil samples can be assessed initially by the a value of the surface equation. The line connecting the inflection points of the interlayer features can be refitted to a paraboloid of rotation. The ratio of the volume of the paraboloid to the volume of the soil sample can be used to evaluate the originality of the soil sample.