IN-SITU PORE WATER PRESSURES AND GROUND MOTIONS DURING THE 1987 CHIBA-TOH0-0KI EARTHQUAKE

概要

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After the Owi Island observation program was terminated, a new recording station was established at Sunamachi, Tokyo Bay, in 1986 to monitor pore water pressures and accelerations during earthquakes. On December 17,1987,an earthquake of magnitude 6.7 shook the area of Tokyo Bay and a set of instruments picked up the motions and pore water pressures. The maximum ground surface acceleration recorded was 122 gal and the pore water pressure rise in the sandy deposits at depths 7 to 13 m was 6% to 14% of the mean effective confining pressure. On the basis of the laboratory test results performed previously on undisturbed samples, an estimate was made of the pore pressures that might have been produced in the deposit by the seismic shaking with a peak acceleration of 122 gal. The estimated values of pore pressure were shown to be in satisfactory agreement with those monitored during the earthquake.
社団法人地盤工学会の論文
1989-12-15