Development and Application of a Large-Scale Static and Dynamic True Triaxial Apparatus for Gravel
Publication: International Journal of Geomechanics
Volume 18, Issue 3
Abstract
To investigate the mechanical characteristics of gravel under general stress conditions, a large-scale static and dynamic true triaxial apparatus was developed at Tsinghua University. The largest specimen was 200 × 200 × 400 mm, and the applied pressure can meet the research requirements of large-scale geotechnical structures. A set of verification experiments with cyclic loadings of different directions and frequencies was performed to verify the accuracy of the loading system. Then, a static true triaxial experiment with constant mean principal stress, p, and generalized shear stress, q, was carried out to study the deformation characteristics of gravel under changing Lode’s angle, θ. The results show that changing Lode’s angle, θ, causes plastic deformations in all principal stress directions. In addition, a series of experiments with both axial and lateral cyclic loadings was carried out to study the deformation characteristics of a gravel specimen under different lateral dynamic conditions. Results from the experiments indicate that lateral dynamic loads significantly change the residual and reversible strains in all three principal directions.
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Acknowledgments
This work was supported by the National Key Research and Development Program of China (2017YFC0804600, 2017YFC0404800, and 2017YFC0805400) and the National Natural Science Foundation of China (51379103, 51479099). The authors are grateful to Dr. Huina Yuan at Tsinghua University for sharing her ideas and valuable discussions on this work.
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Published In
International Journal of Geomechanics
Volume 18 • Issue 3 • March 2018
Copyright
© 2018 American Society of Civil Engineers.
History
Received: May 4, 2017
Accepted: Sep 26, 2017
Published online: Jan 9, 2018
Published in print: Mar 1, 2018
Discussion open until: Jun 9, 2018
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