The influence of foliation on the fragility of granitic rocks, image analysis and quantitative microscopy

Åkesson, Urban; Stigh, Jimmy; Lindqvist, Oliver; Göransson, Mattias

doi:10.1016/s0013-7952(02)00233-8

Cited by 64 publications

(19 citation statements)

References 14 publications

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“…These observations are in agreement with several studies of the formation of microcracks from UCS tests (e.g. [4,27]). According to Åkesson et al [4], a moderate alteration of feldspars gives the mineral grains a more ductile behaviour that reduces stress concentration and cracking of the feldspar grains, which may partly explain why Vandle is stronger than Avja and LEP.…”

Section: Mineral Compositionssupporting

confidence: 93%

“…[4,27]). According to Åkesson et al [4], a moderate alteration of feldspars gives the mineral grains a more ductile behaviour that reduces stress concentration and cracking of the feldspar grains, which may partly explain why Vandle is stronger than Avja and LEP. However, the influence of alteration is not modelled in this study, and future investigations are needed.…”

Section: Mineral Compositionsmentioning

confidence: 99%

“…With the development of quantitative microscopy and image analysis, more and more researchers [2][3][4][5][6] realize that the rock microstructure plays an important role in rock aggregate breakage and have therefore been trying to predict the rock aggregate breakage properties by investigating the relationship between the microstructural and the mechanical properties. In most of the studies, the relationship is obtained from two separate processes: on the one hand, the microstructural properties of rock aggregates are quantified through microscopic method and image analyses; on the other hand, the mechanical properties are evaluated by laboratory mechanical tests.…”

Section: Introductionmentioning

confidence: 99%

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Characterisation of rock aggregate breakage properties using realistic texture‐based modelling

Liu

Lindqvist

Åkesson³

et al. 2011

Num Anal Meth Geomechanics

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SUMMARYRealistic texture-based modelling methods, that is microstructural modelling and micromechanical modelling, are developed to simulate the rock aggregate breakage properties on the basis of the rock actual microstructure obtained using microscopic observations and image analysis. The breakage properties of three types of rocks, that is Avja, LEP and Vandle taken from three quarries in Sweden, in single aggregate breakage tests and in inter-aggregate breakage tests are then modelled using the proposed methods. The microstructural modelling directly integrates the microscopic observation, image analysis and numerical simulation together and provides a valuable tool to investigate the mechanical properties of rock aggregates on the basis of their microstructure properties. The micromechanical modelling takes the most important microstructure properties of rock aggregates into consideration and can model the major mechanical properties. Throughout this study, it is concluded that in general, the microstructure properties of rock aggregate work together to affect their mechanical properties, and it is difficult to correlate a single microstructure property with the mechanical properties of rock aggregates. In particular, for the three types of rock Avja, LEP and Vandle in this study, crack size distribution, grain size and grain perimeter (i.e. grain shape and spatial arrangement) show good correlations with the mechanical properties. The crack length and the grain size negatively affect the mechanical properties of Avja, LEP and Vandle, but the perimeter positively influences the mechanical properties. Besides, the modelled rock aggregate breakage properties in both single aggregate and inter-aggregate tests reveal that the aggregate microstructure, aggregate shape and loading conditions influence the breakage process of rock aggregate in service. For the rock aggregate with the same microstructure, the quadratic shape and good packing dramatically improve its mechanical properties. During services, the aggregate is easiest to be fragmented under point-to-point loading condition, and then in the sequence of multiple-point, point-to-plane and plane-to-plane loading conditions. Copyright

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Section: Mineral Compositionssupporting

confidence: 93%

Section: Mineral Compositionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Characterisation of rock aggregate breakage properties using realistic texture‐based modelling

Liu

Lindqvist

Åkesson³

et al. 2011

Num Anal Meth Geomechanics

Self Cite

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“…The importance of textural characteristics of rocks in describing the mechanical behaviour has been elaborated by several workers (e.g. Tugrul and Zarif, 1999;Fujii et al, 2007;Lindqvist et al, 2007;Yilmaz et al, 2011;Sousa, 2013 (Akesson et al, 2003;Tugrul, 2004;Zorlu et al, 2008;Yilmaz et al, 2011;Sousa, 2013). The mineralogical composition of major rock forming minerals is essential when assessing the mechanical behaviour of rocks together with assessment of the potential influence of texture (Tugrul and Zarif, 1999;Yilmaz et al, 2011;Arif et al, 2013).…”

Section: Rocks Textures As a Controlling Factormentioning

confidence: 99%

“…The increase in complexity in grain geometry actually increases bond strength with adjacent grains (Howarth, 1988;Akesson et al, 2003;Lindqvist et al, 2007). This implies that suturing of minerals along grain boundaries has a positive impact on strength of rock.…”

Section: Textural Description Of Rockmentioning

confidence: 99%

Petrographic features as an effective indicator for the variation in strength of granites

Sajid

Coggan

Arif

et al. 2016

Engineering Geology

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The important textural features include average grain size of rock, grain boundary recrystallization, maximum grain size of major rock forming minerals, mean grain size of cleaved minerals, mineral exsolution and variation of grain size within a rock. The petrographic observations, however, are more effective to describe the strength variation of granites having analogous weathering grade as change in degree of weathering has a dominant effect on rock mechanics.

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Aggregate Research in Support of European Standardisation

Schouenborg¹,

Åkesson²

2004

Engineering Geology for Infrastructure Planning in Europe

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The influence of foliation on the fragility of granitic rocks, image analysis and quantitative microscopy

Cited by 64 publications

References 14 publications

Characterisation of rock aggregate breakage properties using realistic texture‐based modelling

Characterisation of rock aggregate breakage properties using realistic texture‐based modelling

Petrographic features as an effective indicator for the variation in strength of granites

Aggregate Research in Support of European Standardisation

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