Application of Hollow Cylinder Apparatus to Investigate the Behavior of Soil Liquefaction under Near-Fault Seismic Loading

Abstract

Limited by the lack of shearing equipment capable of applying high speed and high frequency the current research on sand liquefaction is relatively lacking in near-fault loading The purpose of this study is to investigate the liquefaction of sand under near-fault loading using hollow cylinder apparatus In this study the clean sand test was used and the near-fault seismic duration of the 1999 Chi-Chi earthquake was taken as the test content and the results were compared with the liquefaction test results of the sine wave repeated shear stress The analysis results show that the ratio of the maximum shear stress ratio to the cyclic resistance ratio (CRR) is about 0 45 in the waveform of high-frequency pulse while the ratio of the significant pulse is about 0 35 In terms of the number of cycles in critical liquefaction the high-frequency pulse corresponds to 3 cycles and the significant pulse is about 1 to 2 cycles From the energy point of view it can be found that initial liquefaction occurs before the energy accumulates to 60% in the waveform of high-frequency pulse while the waveform of the significant pulse must be liquefied after the energy has accumulated to 70%

Date of Award	2019
Original language	English
Supervisor	Wen-Jong Chang (Supervisor)