Noncoaxial Behavior of a Highly Angular Granular Material Subjected to Stress Variations in Simple Vertical Excavation
Publication: International Journal of Geomechanics
Volume 16, Issue 2
Abstract
Experiments were carried out using a dynamic hollow-cylinder apparatus (HCA) to investigate the effects of stress paths and principal stress rotations experienced during a simple vertical excavation on the element-scale deformation and noncoaxial behavior of a highly angular granular material. For this purpose, an improved specimen preparation technique was used to generate homogeneous HCA specimens using a multilayer undercompaction method. The stress paths used in the HCA experiments were extracted from the numerical results obtained in a discrete element simulation of a simple vertical excavation, where complex stress paths and principal stress rotations have been observed. The experimental results show that different stress paths and rotations in excavation significantly affect the element-scale deformation behavior. Noncoaxial behavior (i.e., the deviation of plastic strain increment direction from the principal stress direction) was observed in the HCA tests, which was a result of the combined effects of stress history, mean stress, deviator stress, and principal stress rotation. The deviator stress seems to have a more apparent effect than the mean stress on noncoaxial behavior. The experimental data will be useful in understanding the basic behavior of lunar soil under excavations because both materials share the similar macroscopic and microscopic characteristics.
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Acknowledgments
This research is funded by the China National Funds for Distinguished Young Scientists with Grant No. 51025932, the National Natural Science Foundation of China with Grant No. 51179128, and the Key Scientific and Technological Project of Henan Province with Grant No. 132102210169. All support is greatly appreciated. In addition, the authors would like to express their gratitude to Mr. Jiaxing Su, a graduate of Tongji University, China, for his assistance in laboratory tests.
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Published In
International Journal of Geomechanics
Volume 16 • Issue 2 • April 2016
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Jan 7, 2014
Accepted: Apr 2, 2015
Published online: Jun 23, 2015
Discussion open until: Nov 23, 2015
Published in print: Apr 1, 2016
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