Shear-Displacement-Amplitude Dependent Pore-Pressure Generation in Undrained Cyclic Loading Ring Shear Tests: An Energy Approach
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 131, Issue 6
Abstract
By conducting a series of shear-torque-controlled (STC) and shear-displacement-controlled (SDC) ring shear tests under undrained conditions, the effects of cyclic loading frequency, shear displacement rate, and overconsolidation ratio (OCR) on the pore-pressure generation were examined and analyzed by means of an energy approach. Cyclic STC tests demonstrated that as the frequency of loading increased, the shear energy as well as the total shear displacement until liquefaction substantially decreased, while the number of cycles to liquefaction increased with frequency. Nevertheless, SDC tests showed that , , did not vary with frequency. This dependency of on the loading frequency in STC tests was inferred to be due to the different resultant shear displacement amplitude after shear failure but before liquefaction during cyclic shearing. The results of STC tests on samples with different OCRs showed that all these three parameters of , , increased with OCR. The SDC tests at different shear-displacement amplitude showed that there existed an optimal at which was minimum. smaller than this optimal value was probably not as effective at enforcing the grains to adjust their position, and then it was difficult for the volume shrinkage to occur and pore-water pressure to generate; while an increase in from this optimal value led to extra energy consumption probably due to grain crushing and heat transferring from grains friction, and then elevate the value of for liquefaction. These results proved that pore-pressure generation in undrained cyclic loading was strongly dependent on the shear-displacement amplitude during the shearing.
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Acknowledgments
This study is supported by the Special Coordinating Fund for Promoting Science and Technology of the Ministry of Education, Culture, Sports, Science and Technology of Japan (MEXT), and also is a part of the M101 Project, “Areal Prediction of Earthquake and Rain Induced Rapid and Long-traveling Flow Phenomena” (APERITIF), of the International Programme on Landslides (IPL) supported by the International Consortium on Landslides (ICL).
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Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 131 • Issue 6 • June 2005
Pages: 750 - 761
Copyright
© 2005 ASCE.
History
Received: Jan 29, 2004
Accepted: Oct 2, 2004
Published online: Jun 1, 2005
Published in print: Jun 2005
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