Measurement of Indirect Tensile Strength of Anisotropic Rocks by the Ring Test

Chen, Chao-Shi; Hsu, Shih-Chieh

doi:10.1007/s006030170003

Cited by 59 publications

(32 citation statements)

References 18 publications

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“…Difficulties related to the preparation and gripping of samples causes the uniaxial tensile test to often be avoided when determining the tensile strength of a rock sample (Chen & Hsu, 2001). Indirect methods of determining the tensile strength of rocks therefore become a necessity in order to both efficiently and cost effectively determine the tensile strength of rock samples.…”

Section: Failurementioning

confidence: 99%

“…The standard Brazilian test is the most commonly used experimental method for indirectly deriving the tensile strength of a rock specimen and is suggested by the International Society for Rock Mechanics as the standard for determining the tensile strength of rock samples (Chen & Hsu, 2001).…”

Section: Standard Brazilian Testmentioning

confidence: 99%

“…The effect of hole size on these properties has been modelled analytically in existing literature (Durelli & Lin, 1986: Serati & Williams, 2015: Serati et al, n.d.: Kourkoulis et al, 2015. The ring test has been shown to avoid the criticisms of the standard Brazilian test and serve as an accurate method of determining (indirectly) the tensile strength of rock samples by failure in a pure tensile mode (Chen & Hsu, 2001). (Chen et al, 2008).…”

Section: Annular Brazilian Testmentioning

confidence: 99%

“…Chen and Hsu (2001) used the boundary element method in order to determine the tensile strength of granite samples. The boundary element method (BEM) is a similar numerical modelling method to FEM but with the difference that only the external surfaces (boundaries) need to be meshed in a model (thus saving computational time).…”

Section: Ring Testmentioning

confidence: 99%

“…Generally, numerical modelling is used as an aid to experimental and/or analytical investigations and thus the accuracy of the numerical outcomes is often secondary to the main purpose of the investigations (Mahabadi et al, 2010: Mahabadi et al, 2009: Erarslan and Williams, 2011: Chen and Hsu, 2001: Chen et al, 2007. Therefore, this research project aims to explicitly comment on the accuracy of the combined FEM/DEM code for use in multipoint Brazilian and ring test, and the ability of the code to represent the fracture processes accurately.…”

Section: Knowledge Gapmentioning

confidence: 99%

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Computational modelling of rock fracture during annular Brazilian testing

Mircea-Mihai¹

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Prepared by Mircea-Mihai Mihet 02/11/2016ACKNOWLEDGEMENTS I firstly would like to acknowledge Christopher Leonardi (my supervisor), as without his help I would not have achieved even a fraction of the work that I have. His knowledge in the field and general wisdom has been an invaluable resource and I thank him greatly. I would also like to acknowledge Mehdi Serati who conducted the annular Brazilian experiments for which the models in this paper are based on. Furthermore, acknowledgement should definitely be given to my mother and father who give me the financially means and encouragement to live in Brisbane to attend UQ. i ABSTRACTThe aim of this research paper is to investigate the efficacy of combined FEM/DEM modelling for accurately representing complex stress states and fracture processes. The necessity for this is significant when taking into consideration the range of applications that can benefit from accurately modelling complex stress states and fracture mechanisms. There are direct benefits to the mining and geotechnical industry by being able to confidently simulate large-scale real-world scenarios for which complex stress states and fracture processes must be modelled. To achieve this, a suite of five, 2D FEM/DEM models was suggested based on experimental annular Brazilian tests with quantitative and qualitative outputs for comparison to the experimental data (peak loads and fracture paths). The annular Brazilian test was specifically chosen due to the lack of research in the field of computational modelling of the method, the complex distribution of stresses during loading, the unique fracture mechanisms that follow, and the availability of experimental data and highspeed fracture footage.Three preliminary models were initially conducted on two sample geometries (models 1 and 2 having an inner to outer hole diameter ratio of 0.13 and model 3 having a ratio of 0.5) to validate the code's ability to represent the fractures based on expected outcomes and to investigate the effects of scaling density for increasing computational speed. From the preliminary investigation it was determined that the code could deliver the expected outcomes, though density scaling should be avoided due to its effects on fracture propagation. These models, however, were not compared to the experimental data as they were conducted for an arbitrary coal material for faster fracturing, not the materials used during experimentation.Although there was an initial aim to complete five final models based on the experimental data, only three managed to be (partially) completed. From these models it was evident that the high loading rate caused violent fracturing rather than tensile splitting. However, the preferential fracture planes were consistent with what was observed during experimentation. The peak loads however were not, and this was likely due to the un-even distribution of stresses observed due to the high loading rate. From the models developed in this study the code's efficacy is inconclusive as not enough models were in...

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Section: Failurementioning

confidence: 99%

Section: Standard Brazilian Testmentioning

confidence: 99%