Does liquefaction protect overlying structures from ground shaking?

Student: Francisco Lopez
Supervisor: Dr. J.B. Berrill



When recordings have been obtained at sites that have been liquefied, it is clear that high-frequency components of motion are absorbed as the soil softens after the triggering of pore-pressure increase. However, it is also clear, for example from the 1987 Superstition Hills, Calif., that significant acceleration peaks can be trasmitted before triggering of liquefaction effects. Also, as is now well estblished, liquefied soil retains some shear strength, and long-period motions continue to propagate through the the liquefied layer. The aim of this project is to examine a number of instrumented sites where liquefaction has been seen and to compare estimates of the motion that would have been occurred in the absence of liquefaction with actual recorded motions. If the results permit it, generalizations will be drawn and design rules formulated.

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