Joung Oh
University of New South Wales
Coal miningParametric statisticsGeologyEngineeringBoreholeMining engineeringCaveGeotechnical engineeringMaterials scienceConstitutive equationJoint (geology)BreakoutHydraulic fracturingHorizontal stressExcavationDirect shear testRock mass classificationNumerical analysisComputer simulationCoalStructural engineeringStress (mechanics)Shear (geology)
53Publications
13H-index
506Citations
Publications 53
Newest
#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
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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...
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Last. Ali MirzaghorbanaliH-Index: 10
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#1Naj AzizH-Index: 16
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#1H. Lin (UNSW: University of New South Wales)H-Index: 3
#2S. Singh (UNSW: University of New South Wales)
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...
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#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...
2 CitationsSource
#1Sungsoon Mo (UNSW: University of New South Wales)H-Index: 4
#2Patrycja SheffieldH-Index: 1
Last. Serkan Saydam (UNSW: University of New South Wales)H-Index: 14
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Abstract Excessive floor deformation in underground coal mines, known as floor heave, can cause production delays and thus financial losses. This paper presents parametric studies using numerical models to understand the mechanisms of floor heave in coal mine roadways. An Australian longwall coal mine that experienced significant floor heave in the roadways, where a strong floor unit overlying weak floor units is present immediately below the coal seam, was chosen for field observations. Althoug...
5 CitationsSource
#1Muhammad Asad Pirzada (UNSW: University of New South Wales)H-Index: 3
#2Hamid Roshan (UNSW: University of New South Wales)H-Index: 21
Last. M. Bahaaddini (SBUK: Shahid Bahonar University of Kerman)H-Index: 9
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Abstract Frictional behaviour of joints/faults is of great importance in many geo-engineering applications across different scales. It is known that the joint surface roughness is one of the critical parameters controlling the frictional behaviour of rock joints. While nominal normal and shear stresses acting across the joint asperities are calculated based on overall shearing area, the actual normal and shear stresses can be much greater due to smaller actual contact area. The actual contact ar...
1 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
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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...
4 CitationsSource
#1Alison McQuillan (UNSW: University of New South Wales)H-Index: 3
#2Ismet Canbulat (UNSW: University of New South Wales)H-Index: 12
Last. Joung Oh (UNSW: University of New South Wales)H-Index: 13
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Abstract Strata failure is a principal hazard in open cut coal mining as it has the potential to cause multiple fatalities. Prior to the excavation of any slope, a geotechnical assessment should review the likely slope performance, including the risk of slope failure. Controls to manage this risk to an acceptable level should accompany the geotechnical analysis. A survey of 43 practising geotechnical engineers indicated that kinematic and 2D limit equilibrium analyses were the methods most commo...
4 CitationsSource
#2Ismet CanbulatH-Index: 12
Last. Kevin McDougallH-Index: 12
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Longwall mining is a major mining method to extract thick, flat-lying and extensive seams. Due to the nature of this mining method, the overlying strata move continuously downwards into goaf and as a result, surrounding rocks are distressed, deformed and fractured. In the near area above the mined coal seam, both vertical and horizontal fracturing networks are evident, however within the higher zones, bed separation and slippage are the dominant displacements. The enhanced cracks alter hydraulic...