Accession Number : ADA114112

Title :   Consolidation of Soft Layers by Finite Strain Analysis.

Descriptive Note : Final rept.,


Personal Author(s) : Cargill,Kenneth W

PDF Url : ADA114112

Report Date : Mar 1982

Pagination or Media Count : 118

Abstract : The general theory of one-dimensional finite strain consolidation is developed in terms of the void ratio and time for a moving coordinate system and a material or reduced coordinate system which is time independent. The governing equation is based on fluid continuity and material equilibrium and is totally independent of any restrictions on the form of the void ratio-effective stress and void ratio-permeability relationships. Boundary and initial conditions necessary for equation solution are discussed. Typical initial conditions for a normally consolidated layer and a dredged fill layer are illustrated. Boundary conditions for the free-draining, impermeable, and semipermeable interfaces are derived. A solution of the nonlinear governing equation is derived through the use of an explicit finite difference scheme which preserves the nonlinearity by constantly updating coefficient terms. Solution includes appropriate boundary and initial conditions for any normally consolidated or dredged fill layer. Method of settlement, soil stress, and pore pressure calculation is also given. Conditions necessary for a consistent, stable, and convergent solution are derived in terms of governing equation coefficients. Equation solution requires laboratory-determined void ratio-effective stress and void ratio-permeability relationships in the form of point values. The determination of these relationships from odometer testing is discussed.

Descriptors :   *Soil mechanics, *Strain(Mechanics), Dredged materials, Clay, Layers, Packing density, Modification, Voids, Stresses, Computerized simulation, Computer programs

Subject Categories : Soil Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE