Random field characterization of uniaxial compressive strength and elastic modulus for intact rocks

Rock properties exhibit spatial variabilities due to complex geological processes such as sedimentation, metamorphism, weathering, and tectogenesis. Although recognized as an important factor controlling the safety of geotechnical structures in rock engineering, the spatial variability of rock prope...

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Main Authors: Liu, Hua-Xin, Qi, Xiao-Hui
Other Authors: School of Civil and Environmental Engineering
Format: Article
Language:English
Published: 2018
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Online Access:https://hdl.handle.net/10356/87272
http://hdl.handle.net/10220/44389
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-872722020-03-07T11:43:34Z Random field characterization of uniaxial compressive strength and elastic modulus for intact rocks Liu, Hua-Xin Qi, Xiao-Hui School of Civil and Environmental Engineering Uniaxial Compressive Strength Elastic Modulus Rock properties exhibit spatial variabilities due to complex geological processes such as sedimentation, metamorphism, weathering, and tectogenesis. Although recognized as an important factor controlling the safety of geotechnical structures in rock engineering, the spatial variability of rock properties is rarely quantified. Hence, this study characterizes the autocorrelation structures and scales of fluctuation of two important parameters of intact rocks, i.e. uniaxial compressive strength (UCS) and elastic modulus (EM). UCS and EM data for sedimentary and igneous rock are collected. The autocorrelation structures are selected using a Bayesian model class selection approach and the scales of fluctuation for these two parameters are estimated using a Bayesian updating method. The results show that the autocorrelation structures for UCS and EM could be best described by a single exponential autocorrelation function. The scales of fluctuation for UCS and EM respectively range from 0.3 m to 8.0 m and from 0.3 m to 8.4 m. These results serve as guidelines for selecting proper autocorrelation functions and autocorrelation distances for rock properties in reliability analysis and could also be used as prior information for quantifying the spatial variability of rock properties in a Bayesian framework. Published version 2018-02-02T08:28:36Z 2019-12-06T16:38:38Z 2018-02-02T08:28:36Z 2019-12-06T16:38:38Z 2017 Journal Article Liu, H.-X., & Qi, X.-H. (2017). Random field characterization of uniaxial compressive strength and elastic modulus for intact rocks. Geoscience Frontiers, in press. 1674-9871 https://hdl.handle.net/10356/87272 http://hdl.handle.net/10220/44389 10.1016/j.gsf.2017.11.014 en Geoscience Frontiers © 2017 China University of Geosciences (Beijing) and Peking University. Production and hosting by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). 10 p. application/pdf
institution Nanyang Technological University
building NTU Library
country Singapore
collection DR-NTU
language English
topic Uniaxial Compressive Strength
Elastic Modulus
spellingShingle Uniaxial Compressive Strength
Elastic Modulus
Liu, Hua-Xin
Qi, Xiao-Hui
Random field characterization of uniaxial compressive strength and elastic modulus for intact rocks
description Rock properties exhibit spatial variabilities due to complex geological processes such as sedimentation, metamorphism, weathering, and tectogenesis. Although recognized as an important factor controlling the safety of geotechnical structures in rock engineering, the spatial variability of rock properties is rarely quantified. Hence, this study characterizes the autocorrelation structures and scales of fluctuation of two important parameters of intact rocks, i.e. uniaxial compressive strength (UCS) and elastic modulus (EM). UCS and EM data for sedimentary and igneous rock are collected. The autocorrelation structures are selected using a Bayesian model class selection approach and the scales of fluctuation for these two parameters are estimated using a Bayesian updating method. The results show that the autocorrelation structures for UCS and EM could be best described by a single exponential autocorrelation function. The scales of fluctuation for UCS and EM respectively range from 0.3 m to 8.0 m and from 0.3 m to 8.4 m. These results serve as guidelines for selecting proper autocorrelation functions and autocorrelation distances for rock properties in reliability analysis and could also be used as prior information for quantifying the spatial variability of rock properties in a Bayesian framework.
author2 School of Civil and Environmental Engineering
author_facet School of Civil and Environmental Engineering
Liu, Hua-Xin
Qi, Xiao-Hui
format Article
author Liu, Hua-Xin
Qi, Xiao-Hui
author_sort Liu, Hua-Xin
title Random field characterization of uniaxial compressive strength and elastic modulus for intact rocks
title_short Random field characterization of uniaxial compressive strength and elastic modulus for intact rocks
title_full Random field characterization of uniaxial compressive strength and elastic modulus for intact rocks
title_fullStr Random field characterization of uniaxial compressive strength and elastic modulus for intact rocks
title_full_unstemmed Random field characterization of uniaxial compressive strength and elastic modulus for intact rocks
title_sort random field characterization of uniaxial compressive strength and elastic modulus for intact rocks
publishDate 2018
url https://hdl.handle.net/10356/87272
http://hdl.handle.net/10220/44389
_version_ 1681042375037681664