A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Seismically-induced soil liquefaction is a great threat to the Navy's huge shore facility investment located at the waterfront. Improvement of potentially liquefiable soil beneath and surrounding structures is currently feasible. Using empirical design methods, the construction of stone columns on relatively close centers provides increased resistance to lateral loading from earthquake waves and increases vertical drainage by reducing the radial flow path, which can increase the rate of dissipation of pore water pressure. A background investigation of state-of-the-art soil improvement methods was conducted. The Princeton Effective Stress Soil Model was evaluated as a tool to aid the design of soil improvement methods. Finite element models with and without stone columns were subjected to simulated earthquake excitation using DYNAFLOW, a finite element computer model developed at Princeton University to analyze dynamic soil-structure interaction problems. Results indicate that the stone columns improved site conditions and decreased damage due to vibratory motion. The results also indicated that each potentially liquefiable site is unique and will require individual analysis. Keywords: Liquefaction mitigation, Pore water pressure, Soil, Site improvement, Stone columns, Earthquake loading, Effective stress, Finite elements, DYNAFLOW, Computer simulation, Geology. (JG)
Seismically-induced soil liquefaction is a great threat to the Navy's huge shore facility investment located at the waterfront. Improvement of potentially liquefiable soil beneath and surrounding structures is currently feasible. Using empirical design methods, the construction of stone columns on relatively close centers provides increased resistance to lateral loading from earthquake waves and increases vertical drainage by reducing the radial flow path, which can increase the rate of dissipation of pore water pressure. A background investigation of state-of-the-art soil improvement methods was conducted. The Princeton Effective Stress Soil Model was evaluated as a tool to aid the design of soil improvement methods. Finite element models with and without stone columns were subjected to simulated earthquake excitation using DYNAFLOW, a finite element computer model developed at Princeton University to analyze dynamic soil-structure interaction problems. Results indicate that the stone columns improved site conditions and decreased damage due to vibratory motion. The results also indicated that each potentially liquefiable site is unique and will require individual analysis. Keywords: Liquefaction mitigation, Pore water pressure, Soil, Site improvement, Stone columns, Earthquake loading, Effective stress, Finite elements, DYNAFLOW, Computer simulation, Geology. (JG)
Liquefaction Mitigation Technology
M. T. Millea (author)
1990
37 pages
Report
No indication
English
Structural Analyses , Soil Sciences , Soil & Rock Mechanics , Liquefaction , Background , Computerized simulation , Dynamics , Earthquakes , Excitation , Finite element analysis , Flow fields , Geology , Interactions , Investments , Mathematical models , Motion , Naval shore facilities , Pore pressure , Radial flow , Simulation , Sites , Soil models , Soils , State of the art , Stresses , Structures , Test methods , Threats , Tools , Vibration , Water , Waves , Seismology , Soil dynamics , Earthquake resistant structures , Soil-structure interactions , DYNAFLOW , Princeton effective stress soil model
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