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Variations of hydraulic properties of granular sandstones during water inrush : effect of small particle migration
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Ma, Dan, Rezania, Mohammad, Yu, Hai-sui and Bai, Hai-Bo (2017) Variations of hydraulic properties of granular sandstones during water inrush : effect of small particle migration. Engineering Geology, 217 . pp. 61-70. doi:10.1016/j.enggeo.2016.12.006 ISSN 0013-7952.
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Official URL: https://doi.org/10.1016/j.enggeo.2016.12.006
Abstract
The evaluation of the hydraulic properties evolution of granular sandstones in relation with groundwater inrush within faults is an important issue for mining engineering applications. This paper presents the results of an experimental investigation of small particle migration from granular sandstone samples under different original porosities, particle size compositions and water flow pressures. A new rock testing system has been setup to carry out the tests. Based on the results, it is observed that the overall permeability evolution during the tests can be divided into four different phases, including i) re-arrangement of large rock fragments, ii) water inrush with substantial particle migration, iii) continued moderate particles seepage, and iv) steady state water flow. The crushing of edges and corners of large rock fragments, and the evolution of the fracture network has mainly been observed in the first two phases of the tests. The results indicate that the migration of small particles has an essential effect on permeability and porosity increase during water inrush through fractured sandstone. The samples with higher original porosity, higher percentage of fine particles in their formation and under higher water flow pressures, achieve higher permeability and porosity values when the test is complete. Furthermore, using the measured data, the performances of a number of empirical models, for permeability evolution in fractured porous media, have been studied. The prediction results indicate that not all of the fractures in a sample domain contribute in small particle migration. There are parts of the fracture network that are not effective in particle flow, a sample with less original porosity, more fine particles and under lower water pressure shows less ineffective fractures. Therefore, using the concept of the effective porosity (fracture) is sufficient enough for the flow calculation.
Item Type: | Journal Article | ||||||||||
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Subjects: | T Technology > TN Mining engineering. Metallurgy | ||||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Engineering > Engineering | ||||||||||
Library of Congress Subject Headings (LCSH): | Mining engineering, Coal mines and mining, Environmental geotechnology, Engineering geology | ||||||||||
Journal or Publication Title: | Engineering Geology | ||||||||||
Publisher: | Elsevier BV | ||||||||||
ISSN: | 0013-7952 | ||||||||||
Official Date: | January 2017 | ||||||||||
Dates: |
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Volume: | 217 | ||||||||||
Page Range: | pp. 61-70 | ||||||||||
DOI: | 10.1016/j.enggeo.2016.12.006 | ||||||||||
Status: | Peer Reviewed | ||||||||||
Publication Status: | Published | ||||||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||||||
Date of first compliant deposit: | 6 February 2017 | ||||||||||
Date of first compliant Open Access: | 21 December 2017 | ||||||||||
Funder: | China. Fundamental Research Funds for the Central Universities (FRFCU), Guo jia zi ran ke xue ji jin wei yuan hui (China) [National Natural Science Foundation of China] (NSFC) | ||||||||||
Grant number: | 2015XKZD06 (FRFCU), 51421003 (NSFC) | ||||||||||
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