Assessing the uniaxial compressive strength of extremely hard cryptocrystalline flint

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Title: Assessing the uniaxial compressive strength of extremely hard cryptocrystalline flint
Authors: Aliyu, MM
Shang, J
Murphy, W
Lawrence, JA
Collier, R
Kong, F
Zhao, Z
Item Type: Journal Article
Abstract: Cryptocrystalline flint is an extremely hard siliceous rock that is found in chalk formations. The chalk is frequently a prefered rock type, which in recent decades is often used as a host for underground rock caverns and tunnels in Europe and North America. A reliable estimation of the uniaxial compressive strength (UCS) of the extremely strong flint, with an average UCS of about 600 MPa will provide guidance for a proper engineering design, where flint is encountered, thereby avoiding project progress delay, litigation as well as economic consequences. Conventional UCS measurement using core samples is cumbersome for flint due to the extreme strength and hardness of the rock, for which the core sample preparation process is often extremely difficult. In this study, the UCS prediction models of flints collected from the North-West Europe were developed and the validity of the developed models was investigated. A series of laboratory index tests (comprising the three-point-bending, point load, ultrasonic velocity, density, Shore hardness and Cerchar Abrasivity tests) were perfomed. The index test results were correlated with the UCS values previously determined in the laboratory using both cylindrical and cuboidal specimens to develop the UCS prediction models. Regression analysis of the UCS and the index test results was then performed to evaluate for any potential correlations that can be applied to estimate the UCS of the cryptocrystalline flint. Intensive validity and comparison studies were performed to assess the performance of the proposed UCS prediction models. This study showed that UCS of the tested flint is linearly correlated with its point load strength index, tensile strength and compressional velocity, and is parabolically correlated with its density. The present study also demonstrated that only a couple of the previously developed empirical UCS models for estimating UCS are suitable for flint, which should be used with care.
Issue Date: 1-Jan-2019
Date of Acceptance: 4-Dec-2018
URI: http://hdl.handle.net/10044/1/67583
DOI: https://dx.doi.org/10.1016/j.ijrmms.2018.12.002
ISSN: 1365-1609
Publisher: Elsevier
Start Page: 310
End Page: 321
Journal / Book Title: International Journal of Rock Mechanics and Mining Sciences
Volume: 113
Copyright Statement: © 2019 Elsevier Ltd. All rights reserved. This manuscript is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Licence http://creativecommons.org/licenses/by-nc-nd/4.0/
Keywords: Science & Technology
Technology
Physical Sciences
Engineering, Geological
Mining & Mineral Processing
Engineering
Flint
Uniaxial compressive strength
Empirical estimation
Drilling
TBM tunneling
POINT LOAD STRENGTH
P-WAVE VELOCITY
CERCHAR ABRASIVITY INDEX
ENGINEERING PROPERTIES
ELASTIC PROPERTIES
GRANITIC-ROCKS
PRESERVATION
POROSITY
MODULUS
TENSILE
0905 Civil Engineering
0914 Resources Engineering And Extractive Metallurgy
Mining & Metallurgy
Publication Status: Published
Embargo Date: 2019-12-20
Online Publication Date: 2018-12-20
Appears in Collections:Faculty of Engineering
Civil and Environmental Engineering
Geotechnics



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