Influence of ground water on soil-structure interaction

Technical Report · Tue Dec 01 00:00:00 EST 1987

DOI:https://doi.org/10.2172/5529456· OSTI ID:5529456

Costantino, C. J.; Philippacopoulos, A. J.

This report presents a summary of the second year's effort on the subject of the influence of foundation ground water on the SSI phenomenon. A finite element computer program, developed during the first year's effort, was used to study the impact of depth to the ground water surface on the SSI problem. The formulation used therein is based on the Biot dynamic equations of motion for both the solid and fluid phases of a typical soil. Frequency dependent interaction coefficients were then generated for the two-dimensional plane problem of a rigid surface footing moving against a linear soil. The soil is considered dry above the GWT and fully saturated below. The results indicate that interaction coefficients are significantly modified as compared to the comparable values for a dry soil, particularly for the rocking mode of response, if the GWT is close to the foundation. As the GWT moves away from the foundation, these effects decrease in a relatively orderly fashion for both the horizontal and rocking modes of response. For the vertical interaction coefficients, the rate of convergence to the dry solution is frequency dependent. Calculations were made to study the impact of the modified interaction coefficients on the response of a typical nuclear reactor building. The amplification factors for a stick model placed atop a dry and saturated soil were computed. It was found that pore water caused the rocking response to decrease and translational response to increase over the frequency range of interest, as compared to the response on dry soil. 30 refs., 31 figs.

• Research Organization: City Univ. of New York, NY (USA); Brookhaven National Lab. (BNL), Upton, NY (United States)
• DOE Contract Number: AC02-76CH00016
• OSTI ID: 5529456
• Report Number(s): NUREG/CR-4784; BNL-NUREG-52039; ON: TI88006086
• Country of Publication: United States
• Language: English

Related Subjects

22 GENERAL STUDIES OF NUCLEAR REACTORS
FOUNDATIONS
SOIL-STRUCTURE INTERACTIONS
NUCLEAR POWER PLANTS
FINITE ELEMENT METHOD
GROUND WATER
MATHEMATICAL MODELS
PROGRESS REPORT
DOCUMENT TYPES
HYDROGEN COMPOUNDS
MECHANICAL STRUCTURES
NUCLEAR FACILITIES
NUMERICAL SOLUTION
OXYGEN COMPOUNDS
POWER PLANTS
SUPPORTS
THERMAL POWER PLANTS
WATER
220200* - Nuclear Reactor Technology- Components & Accessories