Motion and Stability of Saturated Soil Systems under Dynamic Loading.
Abstract
In a review of the assumptions underlying various theories of interacting continua, an important finding was that the notion of the mixture as a continuum in motion is inadmissible except in the case of no relative motion between the constituents. Liquefaction of soil is primarily associated with relative motion of soil and water. Finite element implementation of Biot's theory was studied in respect to effectiveness of the popular time integration schemes as well as spatial discretization for one and two-dimensional wave propagation. Results showed that the conventional time-domain integration procedures which are quite effective for single material problems are not reliable for saturated soils. The numerical results were found to be quite sensitive to the choice of time-domain integration parameters. Variational formulations of Biot's theory were developed to construct a basis for alternative finite element approaches. For nonlinear problems, incremental equations were developed and variational formulation attempted allowing only material nonlinearity. In saturated soils subjected to dynamic loads, depending upon permeability and pore geometry, a part of the water would possible be trapped and move with the soil rather than relative to it. This mass coupling effect was examined parametrically. It was found that soil displacements are not sensitive to the degree of coupling, but the pattern of pore pressure in the ime domain could be affected significantly.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 04, 1985
- Accession Number
- ADA174902
Entities
People
- Ranbir S. Sandhu
Organizations
- Ohio State University