Abstract
A study was conducted to investigate non-Darcy flow for sandstone using an experimental system designed and constructed by the research group. Non-Darcy flow was found to exist for both the pre-peak and post-peak strains; post-peak flow behavior showed a higher level of non-Darcy flow. In addition, the post peak permeability turned out to be about 2–3 times that of the pre-peak permeability. This sudden change in permeability that occurs when sedimentary rock masses around underground excavations develop new fractures may lead to water inrush in coal mines. All three non-Darcy permeability parameters showed significant changes between the pre-peak and post peak strains. The main reason for that is the formation of new cracks around and after the peak stress. Relations are developed among the three non-Darcy permeability parameters.
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Acknowledgments
This study was supported by the National Basic Research Program of China (973 Program: No. 2013CB227900) and Ordinary University Graduate Scientific Research Innovation Project of Jiangsu Province (No. KYLX_1368, No. CXZZ13_0924) and the National Natural Science Foundation of China (No. 11502229). The first author would like to thank the Chinese Scholarship Council for providing a scholarship to conduct a part of the described research as a Visiting Research Student at the University of Arizona. The authors would like to thank the anonymous reviewer for the critique which helped to improve the presentation of the paper.
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Ni, X., Kulatilake, P.H.S.W., Chen, Z. et al. Experimental Investigation of Non-Darcy Flow in Sandstone. Geotech Geol Eng 34, 1835–1846 (2016). https://doi.org/10.1007/s10706-016-9992-y
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DOI: https://doi.org/10.1007/s10706-016-9992-y