- Preface
- E.T. Brown
- Book Title / Journal: Journal of Rock Mechanics and Geotechnical Engineering
- Year: 2019 , Volume: 11
- Rock Mechanics
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- The Hoek–Brown failure criterion and GSI – 2018 edition
- E. Hoek ; E.T. Brown
- Book Title / Journal: Journal of Rock Mechanics and Geotechnical Engineering
- Year: 2019 , Volume: 11
- Rock Mechanics
- Keywords: Hoek-Brown criterion ; Geological strength index (GSI) ; Rock mass strength ; Uniaxial compressive strength (UCS) ; tension cut-off ; Rock mass deformation modulus
- Abstract
The Hoek–Brown criterion was introduced in 1980 to provide input for the design of underground excavations in rock. The criterion now incorporates both intact rock and discontinuities, such as joints, characterized by the geological strength index (GSI), into a system designed to estimate the mechanical behaviour of typical rock masses encountered in tunnels, slopes and foundations. The strength and deformation properties of intact rock, derived from laboratory tests, are reduced based on the properties of discontinuities in the rock mass. The nonlinear Hoek–Brown criterion for rock masses is widely accepted and has been applied in many projects around the world. While, in general, it has been found to provide satisfactory estimates, there are several questions on the limits of its applicability and on the inaccuracies related to the quality of the input data. This paper introduces relatively few fundamental changes, but it does discuss many of the issues of utilization and presents case histories to demonstrate practical applications of the criterion and the GSI system. PDF |
- Back Analysis in Rock Engineering, Shunsuke Sakurai
- E.T. Brown
- Book Title / Journal: Journal of Rock Mechanics and Geotechnical Engineering
- Year: 2018 , Volume: 10
- Rock Mechanics
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- Editorial
- E.T. Brown
- Book Title / Journal: Journal of Rock Mechanics and Geotechnical Engineering
- Year: 2017 , Volume: 9
- Rock Mechanics
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- Reducing risks in the investigation, design and construction of large concrete dams
- E.T. Brown
- Book Title / Journal: Journal of Rock Mechanics and Geotechnical Engineering
- Year: 2017 , Volume: 9
- Rock Mechanics
- Keywords: Concrete dam failure ; Dam engineering ; risk assessment ; Rock engineering design ; Site Investigation
- Abstract
An overview of the GeoSafe 2016 Symposium topic is provided using the example of large concrete dams for purposes of illustration. It is essential that the risks associated with large dams be evaluated rigorously and managed proactively at all stages of their lives so that the risk of failure remains As Low As Reasonably Practicable (ALARP). Rock engineering features of large concrete dams that require particular attention, assessment and monitoring during the investigation, design, construction, initial filling, in-service operation, and subsequent repair and upgrade stages of the lives of concrete dams are identified and illustrated by examples from recorded experiences. A number of major concrete dam failures, including that of the St. Francis dam, California, U.S.A., in 1928, have led to significant developments in rock mechanics and rock engineering knowledge and techniques, as well as in dam design and review processes. More recent advances include a range of analytical, numerical modelling, probabilistic, reliability, failure mode and risk assessment approaches. PDF |
- Rock engineering design of post-tensioned anchors for dams – A review
- E.T. Brown
- Book Title / Journal: Journal of Rock Mechanics and Geotechnical Engineering
- Year: 2015 , Volume: 7
- Rock Mechanics
- Keywords: Dam engineering ; post-tensioned anchors ; Rock engineering design ; Grout–tendon bond ; Rock–grout bond ; Rock mass uplift failure
- Abstract
High-capacity, post-tensioned anchors have found wide-spread use, originally in initial dam design and construction, and more recently in the strengthening and rehabilitation of concrete dams to meet modern design and safety standards. Despite the advances that have been made in rock mechanics and rock engineering during the last 80 years in which post-tensioned anchors have been used in dam engineering, some aspects of the rock engineering design of high-capacity rock anchors for dams have changed relatively little over the last 30 or 40 years. This applies, in particular, to the calculations usually carried out to establish the grouted embedment lengths required for deep, post-tensioned anchors. These calculations usually make simplified assumptions about the distribution and values of rock–grout interface shear strengths, the shape of the volume of rock likely to be involved in uplift failure under the influence of a system of post-tensioned anchors, and the mechanism of that failure. The resulting designs are generally conservative. It is concluded that these aspects of the rock engineering design of large, post-tensioned rock anchors for dams can be significantly improved by making greater use of modern, comprehensive, numerical analyses in conjunction with three-dimensional (3D) models of the rock mass structure, realistic rock and rock mass properties, and the results of prototype anchor tests in the rock mass concerned. PDF |
- Rock engineering design of post-tensioned anchors for dams – A review
- E.T. Brown
- Book Title / Journal: Journal of Rock Mechanics and Geotechnical Engineering
- Year: 2015 , Volume: 7
- Rock Mechanics
- Keywords: post-tensioned anchors ; rock engineering ; post-tensioned anchors ; rock engineering
- Description
- High-capacity, post-tensioned anchors have found wide-spread use, originally in initial dam design and construction, and more recently in the strengthening and rehabilitation of concrete dams to meet modern design and safety standards. Despite the advances that have been made in rock mechanics and rock engineering during the last 80 years in which post-tensioned anchors have been used in dam engineering, some aspects of the rock engineering design of high-capacity rock anchors for dams have changed relatively little over the last 30 or 40 years. This applies, in particular, to the calculations usually carried out to establish the grouted embedment lengths required for deep, post-tensioned anchors. These calculations usually make simplified assumptions about the distribution and values of rock–grout interface shear strengths, the shape of the volume of rock likely to be involved in uplift failure under the influence of a system of post-tensioned anchors, and the mechanism of that failure. The resulting designs are generally conservative. It is concluded that these aspects of the rock engineering design of large, post-tensioned rock anchors for dams can be significantly improved by making greater use of modern, comprehensive, numerical analyses in conjunction with three-dimensional (3D) models of the rock mass structure, realistic rock and rock mass properties, and the results of prototype anchor tests in the rock mass concerned.
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- Rock Engineering Risk
- E.T. Brown
- Book Title / Journal: Journal of Rock Mechanics and Geotechnical Engineering
- Year: 2015 , Volume: 7
- Rock Mechanics
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- Editorial
- E.T. Brown
- Book Title / Journal: Journal of Rock Mechanics and Geotechnical Engineering
- Year: 2015 , Volume: 7
- Rock Mechanics
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- Rock Mechanics Based on an Anisotropic Jointed Rock Model (AJRM)
- E.T. Brown
- Book Title / Journal: Journal of Rock Mechanics and Geotechnical Engineering
- Year: 2015 , Volume: 7
- Rock Mechanics
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- Rock Engineering Design by Xiating Feng and John A Hudson
- E.T. Brown
- Book Title / Journal: Journal of Rock Mechanics and Geotechnical Engineering
- Year: 2012 , Volume: 4
- Rock Mechanics
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- Practical Estimates or Rock Mass Strength
- E.T. Brown ; E. Hoek
International Journal of Rock Mechanics and Mining Sciences, Vol. 34 (8), pp. 1165-1186 - Year: 1997
- Rock Mechanics
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- Trends in Relationships between Measured Rock In-Situ Sresses and Depth
- E.T. Brown ; E. Hoek
International Journal of Rock Mechanics and Mining Science & Geomechanics Abstracts, Vol.15, pp. 211-215. Pergamon Press Ltd, Great Britain - Year: 1978
- Rock Mechanics
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- Brittle Fracture of Rock at Low Confining Pressures
- E.T. Brown
- Australia - New Zealand Conferences on Geomechanics - 1st Australia-New Zealand Conference on Geomechanics
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- Rock Mechanics
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- The Mechanics of Discontinua: Engineering in Discontinuous Rock Masses
- E.T. Brown
- Australia - New Zealand Conferences on Geomechanics - 9th Australia - New Zealand Conference on Geomechanics (Auckland, 2004)
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- Rock Mechanics
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