Lessons Learned from the Observed Seismic Settlement at the Jensen Filtration Plant in the San Fernando Earthquake
Publication: Lifelines 2022
ABSTRACT
The Joseph Jensen Filtration Plant of the Metropolitan Water District is located in the area of strongest shaking generated by the 1971 San Francisco Earthquake. One or more concrete basins which had been precisely leveled settled by amounts of up to 6 in., of which about 4 in. were estimated to be due to compaction, rendering the plant inoperative. The primary lesson that was learned is that the amount of settlement that was observed could not have been predicted based on the calculated history of cyclic shear strains using a single component of the earthquake motion. However, it was found that the settlements caused by each component acting separately could be added to approximate the settlements caused by multi-directional loading. It is now practical to conduct bi-directional nonlinear effective stress site response analyses running the two horizontal components simultaneously and adding the settlements and excess pore pressures that are calculated for each component at each time step.
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Lifelines 2022
Pages: 37 - 47
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Published online: Nov 16, 2022
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