Theory of Poroelasticity for Consolidation in Saturated Soils with Gravity Effect under Cyclic Loading

  • 雷 沃

Student thesis: Master's Thesis


Only few studies have used the popular theory of linear poroelasticity to conduct quantitative research on the effect of gravity on consolidation In this thesis the theory of poroelasticity is generalized to account for gravitational body forces Two coupled partial differential equations are derived that together govern the three-dimensional consolidation of saturated porous media The governing equations are adapted to the one-dimensional compression of a homogeneous saturated clay layer For this example an instantaneous undrained response is taken as the initial condition Additionally boundary conditions are defined in a way that allows us to incorporate cyclic loading and the following three drainage scenarios: top drained bottom drained and top and bottom drained Subsequently the consolidation problem was solved numerically using a finite difference scheme The obtained results show that the effect of body forces on pore water pressure increases with depth to a maximum after one day of 0:9 % and 1:3 % under cyclic and constant loading conditions respectively It is also shown that pore pressures become highly variable over depth after 1 hour after the start of cyclic loading Lastly we demonstrate that total settlement over time is significantly lower when a cyclic load is imposed instead of a constant load and that the manner of loading and the type of drainage condition have no effect on the relative difference in total settlement resulting from the gravity effect
Date of Award2018 Oct 18
Original languageEnglish
SupervisorWei-Cheng Lo (Supervisor)

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