Bruce Hebblewhite
University of New South Wales
Coal miningGeologyEngineeringLongwall miningMining engineeringSubsidenceGeomechanicsGeotechnical engineeringMaterials scienceJoint (geology)RoofStress corrosion crackingRisk managementEnvironmental scienceDirect shear testRock mass classificationCoalMechanicsStructural engineeringShear (geology)
Publications 97
#1H. Lin (UNSW: University of New South Wales)H-Index: 3
#2Joung Oh (UNSW: University of New South Wales)H-Index: 13
Last. Stuart D.C. Walsh (Monash University)H-Index: 22
view all 6 authors...
Abstract Borehole breakout initiation stress is critical for mining and geotechnical engineering as it indicates horizontal stress magnitudes and rock quality in a specific layer. This stress can be significantly intensified under laboratory conditions where the borehole size is small, although the specimen sizes in previous studies varied. This may result in inaccurate experimental results as the sample itself is affected by the scale effect. In this paper, two series of normal compression test...
#1Peter Craig (UNSW: University of New South Wales)H-Index: 6
#2Hamed Lamei Ramandi (UNSW: University of New South Wales)H-Index: 16
Last. Serkan Saydam (UNSW: University of New South Wales)H-Index: 14
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Abstract Premature failure of rockbolts due to stress corrosion cracking (SCC) is an unresolved global issue in underground structures, particularly underground mines. To date, SCC of rockbolts has been produced in laboratory-based studies under laboratory conditions, however no attempt to produce SCC in-situ in actual underground coal mine conditions has previously been made. In this study, an innovative testing methodology was used in which a rockbolt coupon was developed with multiple stresse...
1 CitationsSource
#1H. Lin (UNSW: University of New South Wales)H-Index: 3
#2Sarvesh Kumar Singh (UNSW: University of New South Wales)H-Index: 2
Last. T.R. Stacey (University of the Witwatersrand)H-Index: 1
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Abstract In this paper, a newly proposed approach on horizontal stress estimation from borehole breakout data is presented. In a previous study, a machine learning model was developed, capable of estimating maximum horizontal stress (σH) from breakout data accurately. However, due to the limitation in experimental data, it was difficult to obtain the minimum horizontal stress (σh) reliably. In this study, a series of breakout tests on Hydrostone-TB specimens was carried out to investigate the in...
2 CitationsSource
#1H. Lin (UNSW: University of New South Wales)H-Index: 3
#2Won-Hee Kang (USYD: University of Sydney)H-Index: 14
Last. Bruce Hebblewhite (UNSW: University of New South Wales)H-Index: 19
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Abstract Estimation of horizontal stress magnitudes from borehole breakouts has been an attractive topic in the petroleum and mining industries, although there are critical research gaps that remain unfilled. In this paper, numerical simulation is conducted on Gosford sandstone to investigate the borehole breakout and its associated borehole size effect, including temperature influence. The discrete element method (DEM) model shows that the borehole breakout angular span is constant after the in...
7 CitationsSource
#1Sungsoon Mo (UNSW: University of New South Wales)H-Index: 4
#2Hamed Lamei Ramandi (UNSW: University of New South Wales)H-Index: 16
Last. Serkan Saydam (UNSW: University of New South Wales)H-Index: 14
view all 7 authors...
Abstract Several underground coal mines have reported floor heave associated with the buckling mechanism. However, studies on the coal mine floor, especially the buckling failure mechanism in the floor and relevant analysis techniques, are still insufficient. This paper introduces a new floor classification system, the Coal Mine Floor Rating, based on the underlying failure mechanisms. The new floor mass rating system quantifies the stability of floor strata by considering two main factors: unia...
5 CitationsSource
#1Martin S. Brook (University of Auckland)H-Index: 2
#2Bruce Hebblewhite (UNSW: University of New South Wales)H-Index: 19
Last. Rudrajit Mitra (University of the Witwatersrand)H-Index: 12
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Abstract The rock mass rating (RMR) has been used across the geotechnical industry for half a century. In contrast, the coal mine roof rating (CMRR) was specifically introduced to underground coal mines two decades ago to link geological characterization with geotechnical risk mitigation. The premise of CMRR is that strength properties of mine roof rock are influenced by defects typical of coal measures stratigraphy. The CMRR has been used in longwall pillar design, roof support methods, and eva...
6 CitationsSource
Abstract Historically there have been a number of different hypotheses and empirical models developed in an attempt to describe the nature of fracturing above longwall panels in underground coal mining. The motivation for such models varies, ranging from understanding the impact of mining on surface subsidence, to back-analysis of caving behaviour in the immediate roof behind the longwall face. One of the most critical motivating factors that is taking on increased importance in many coalfields,...
6 CitationsSource
#1Honghao ChenH-Index: 6
#2Önder KimyonH-Index: 8
Last. Christina MorrisH-Index: 10
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Corrosion failure is one of the serious concerns with most metal products. In the mining industry, corrosion failure of cable bolts may threaten the safety of operations and cause significant financial losses. In recent years, many cable bolt failures have been reported from several underground coal mines in Australia. Recent studies have shown that the localised environment around the cable bolts (oxygen level, groundwater, bacteria, etc.) has a significant impact on the corrosion behaviour; ho...
1 CitationsSource
#1Onur Vardar (UNSW: University of New South Wales)H-Index: 4
#2Chengguo Zhang (UNSW: University of New South Wales)H-Index: 12
Last. Bruce Hebblewhite (UNSW: University of New South Wales)H-Index: 19
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Abstract Coal burst is a manifestation of rapid energy release, which is considered as one of the most critical operational hazards in underground coal mines. This study numerically investigates the effects of discontinuities on the strength and energy release characteristics of coal mass samples under uniaxial compression. The universal distinct element code (UDEC) was used to model pillar-scale coal mass samples that were represented by an assembly of triangular deformable blocks, and pre-exis...
9 CitationsSource
#1Charlie C. Li (NTNU: Norwegian University of Science and Technology)H-Index: 19
#2Peter MikulaH-Index: 2
Last. Nuwen Xu (Sichuan University)H-Index: 28
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Abstract The paper is a summary of discussions on four topics in rockburst and dynamic ground support. Topic 1 is the mechanisms of rockburst. Rockburst events are classified into two categories in accordance with the triggering mechanisms, i.e. strain burst and fault-slip burst. Strain burst occurs on rock surfaces when the tangential stress exceeds the rock strength in hard and brittle rocks. Fault-slip burst is triggered by fault-slip induced seismicity. Topic 2 is prediction and forecasting ...
11 CitationsSource