Experimental Research on Permeability Evolution with Microcrack Development in Sandstone under Different Fluid Pressures
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 142, Issue 6
Abstract
Sandstone is encountered in many hydropower projects in China, and its permeability evolution characteristics during the deformation process are one of the most important issues in engineering design. In this study, microstructure observation and mineral content analysis of a sandstone are performed, and triaxial flow experiments under different fluid pressures are carried out. The experiment results show that the permeability evolution with volumetric strain is associated with microcrack development in the process of rock deformation and failure. The volumetric strain is closely related to the permeability and fluid pressure, and it plays a role of linking the flow field and the stress field. A conceptual model is suggested to describe the permeability evolution of the rock. Scanning electron microscope analysis results on some failed specimen pieces illustrate that the fluid pressure plays a role in the development of microcracks. A high fluid pressure can accelerate crack propagation and rock failure, decrease the crack damage stress, and increase the flow in the sandstone.
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Acknowledgments
Financial support provided by Qing Lan Project, the Natural Science Foundation of China (Grant Nos. 11272113, 51479049, 11572110), the Natural Science Foundation of Jiangsu Province (Grant No. BK2012809) are gratefully acknowledged.
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Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 142 • Issue 6 • June 2016
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© 2016 American Society of Civil Engineers.
History
Received: May 5, 2015
Accepted: Nov 2, 2015
Published online: Mar 2, 2016
Published in print: Jun 1, 2016
Discussion open until: Aug 2, 2016
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