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Water 2018, 10(6), 779; https://doi.org/10.3390/w10060779

Study of the Scale Effect on Permeability in the Interlayer Shear Weakness Zone Using Sequential Indicator Simulation and Sequential Gaussian Simulation

1
College of hydrology and Water Resources, Hohai University, No. 8 Focheng West Road, 211100 Nanjing, China
2
School of Earth Science and Engineering, Hohai University, No. 8 Focheng West Road, 211100 Nanjing, China
3
Beijing Research Institute of SINOPEC Group, 100728 Beijing, China
*
Author to whom correspondence should be addressed.
Received: 1 May 2018 / Revised: 11 June 2018 / Accepted: 11 June 2018 / Published: 13 June 2018
(This article belongs to the Section Hydrology)
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Abstract

The interlayer shear weakness zone (ISWZ) is a deformation zone in stratified rock masses, with different width and spacing, due to tectonic stresses. It represents the main flow path in rocks due to higher permeability compared with massive rocks. The permeability values of an ISWZ can vary significantly depending on the scale. This study focuses on the correlations between the permeability properties of ISWZs and their geometry properties. A range of realistic 3-D numerical models of ISWZs is developed using geostatistical modeling, with fine-scale geometry and permeability information taken into consideration. These ISWZs represent a set of mud content and width distributions that are typical for ISWZs. Horizontal and vertical permeability values for all ISWZs are found to change in small-scale samples, whereas these fluctuations decrease with increasing sample size. For different types of ISWZs, the results show that ISWZs with variable width will show a significantly larger scale effect on the permeability than that of ISWZs with constant width. Furthermore, ISWZs with a higher mud content display greater variation in horizontal permeability, while the opposite is true for vertical permeability. Based on the coefficient of permeability variation, a criterion is proposed to identify the calculated permeability of a sample is locally homogeneous. The size for this sample relies on the properties estimated (horizontal and vertical permeability) and geometry features. These findings could provide a basis for the selection of permeability values of an ISWZ in hydraulic engineering. Additionally, the procedures used in this article can be applied to any type of ISWZs. View Full-Text
Keywords: groundwater; permeability; heterogeneity and anisotropy; scale effect; structural plane; interlayer shear weakness zone; sequential indicator simulation; sequential gaussian simulation groundwater; permeability; heterogeneity and anisotropy; scale effect; structural plane; interlayer shear weakness zone; sequential indicator simulation; sequential gaussian simulation
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Chen, M.; Zhou, Z.; Zhao, L.; Lin, M.; Guo, Q.; Li, M. Study of the Scale Effect on Permeability in the Interlayer Shear Weakness Zone Using Sequential Indicator Simulation and Sequential Gaussian Simulation. Water 2018, 10, 779.

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