科研之友
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摘要
Compressibility and permeability are two major coupled factors for the engineering properties of soils. Such hydro-mechanical behaviors of soil greatly rely on the composition and the structure of soil which is often expressed in terms of porosity. In this paper, the effect of soil porosity on the soil mechanisms is studied in the research of Biot's consolidation for soft soil. Assuming a constant porosity in a finite layer, the drained bulk modulus and the permeability are porosity-dependent, and the fluid and the soil skeleton of highly saturated soil are assumed to be compressible. The expressions of displacement, stress and pore pressure are obtained with the aid of Laplace-Hankel transforms for the axisymmetric problem. The continuity of multilayered soil yields the global stiffness matrix in the transformed domain. Meanwhile, by introducing the stiffness matrix of the soil base, the compressible and permeable boundary conditions are more acceptable in practical engineering and the global stiffness matrix is then solved in the transformed domain. Taking the inverse of the Laplace-Hankel transforms gives the real answers for Biot's consolidation. The results show that the increase in porosity leads to a higher compressibility and permeability of soil, and consequently, causes a higher settlement and accelerates the process of consolidation. However, the assumption of the constant porosity of soil has some limitations due to ignoring the nonlinear development of soil structure during consolidation and the further works about the variation modes of porosity need to be done for a better understanding of soil consolidation.
