LASS-II, computer program for analysis of seismic response and liquefaction of horizontally layered saturated sands. Technical report

Technical Report · Wed Jun 01 04:00:00 EDT 1977

OSTI ID:6439404

Ghaboussi, J; Dikmen, S U

A new approach to analysis of seismic response and evaluation of the liquefaction potential of saturated sands is presented. Work on the development of a two-phase fluid solid model for quasi-static and dynamic analysis of saturated soils was extended here by using a nonlinear material model to represent the behavior of a solid granular medium. The separate phases of the solid granular skeleton and the pore water are modeled individually, and the coupling between these two phases is taken into account. The pore water is allowed to flow with respect to the granular solid. This process is assumed to be governed by the Darcy flow law with the coefficient of permeability as the material constant. Dynamic analysis of this model allows for the direct determination of the time histories of pore water pressures and effective stresses. The seismic response of the system to earthquake base acceleration is also determined in the process of dynamic analysis. The material model used is defined in terms of effective stresses. Criteria for the occurrence of initial liquefaction and onset of liquefaction are defined in terms of effective stresses and are included in the material model.

• Research Organization: Illinois Univ., Urbana (USA)
• OSTI ID: 6439404
• Report Number(s): PB-281108; UILU-ENG-77-2010
• Country of Publication: United States
• Language: English

Related Subjects

510100* -- Environment
Terrestrial-- Basic Studies-- (-1989)
54 ENVIRONMENTAL SCIENCES
58 GEOSCIENCES
580201 -- Geophysics-- Seismology & Tectonics-- (1980-1989)
COMPUTER CODES
DARCY LAW
DATA ANALYSIS
EARTHQUAKES
L CODES
LIQUEFACTION
SAND
SATURATION
SEISMIC EVENTS
SEISMIC WAVES
SOILS
THERMOCHEMICAL PROCESSES