Abstract
The possibility of a correlation between dynamic pore pressure increase p and dissipated energy density D in soils subjected to earthquake shaking has been the subject of speculation for nearly 20 years. While cyclic loading tests have tended to confirm the D-p hypothesis in the laboratory, no field confirmation has been given. In this paper compelling evidence is presented to support the D-p model from two real earthquakes. Downhole acceleration records from two earthquakes are analyzed to obtain approximate histories of shear stress, shear strain, and dissipated energy over a range of depths. The measured data were obtained from the Lotung downhole array in Taiwan and from the Sunamachi downhole array near Tokyo. Both of these arrays also contain pore pressure measurement devices, and records of pore-pressure increase during the earthquakes are available. Time histories of measured pore pressure will be directly compared with calculated values based on the D-p hypothesis. The results of this study suggest dissipated energy density may be remarkably well correlated with pore pressure increase in field situations.
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