Comparison of Residual Shear Strengths from Back Analysis and Ring Shear Tests on Undisturbed and Remolded Specimens
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 131, Issue 9
Abstract
Slope stabilization procedures for six landslides in the Niigata prefecture in Japan afforded an excellent opportunity to examine the residual drained shear strength of weathered mudstones. Installation of 3 m diameter drainage galleries allowed undisturbed block samples to be collected which contained the slickenside surface of the failure plane. Ring shear tests were conducted on undisturbed samples and remolded samples of the same material. In addition to the laboratory testing, back analysis was performed to calculate the residual shear strength parameters of the slopes. Good agreement was found between the residual friction angles determined from back analysis, tests on undisturbed samples, and tests on remolded specimens. Many of the landslide materials exhibited a small cohesion at low values of effective normal stress, but the secant friction angle achieved a constant value at higher normal stresses.
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Acknowledgments
The writers would like to thank Yasuzuka Civil Works of Niigata Prefectural Government for the support to collect the undisturbed soil samples from the shearing zones and making available all the documents related to the landslides under study. Their special appreciation goes to Professor James Michael Duncan of Virginia Tech for his invaluable review and suggestions on the paper. They would also like to thank all the individuals and institutions who have cooperated during the research period.
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Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 131 • Issue 9 • September 2005
Pages: 1071 - 1079
Copyright
© ASCE.
History
Received: Oct 13, 2004
Accepted: Feb 23, 2005
Published online: Sep 1, 2005
Published in print: Sep 2005
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