Prediction of Peak Shear Strength of Natural, Unfilled Rock Joints Accounting for Matedness Based on Measured Aperture
| العنوان: | Prediction of Peak Shear Strength of Natural, Unfilled Rock Joints Accounting for Matedness Based on Measured Aperture |
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| المؤلفون: | Ríos Bayona, Francisco, Johansson, Fredrik, 1973, Ivars, Diego Mas |
| المصدر: | Rock Mechanics and Rock Engineering. 54(3):1533-1550 |
| مصطلحات موضوعية: | Natural rock joints, Peak shear strength, Rock joint aperture, Rock joint matedness, Forecasting, Rocks, Surface roughness, Contact surface, Geological process, High resolution, Mechanical behaviour, Objective measurement, Shear displacement, Visual inspection, Weathering, displacement, fracture aperture, joint, mechanical property, prediction, rock mechanics, shear strength |
| الوصف: | The mechanical behaviour of natural, unfilled rock joints is influenced by the interaction between surface roughness and matedness of the contact surfaces. In the field, natural rock joints normally exhibit a mismatch between the contact surfaces, mainly due to different geological processes such as weathering or deformations. Various attempts have been made to estimate how matedness of rock joints influences their peak shear strength. However, the proposed methodologies imply certain difficulties since they are intended to estimate the matedness of rock joints based mainly on visual inspection, and by relating an initial shear displacement to the length of the analysed sample or by relating the opening of saw-tooth and two-dimensional joint profiles with the degree of interlocking. Therefore, a tested peak shear strength criterion for natural, unfilled rock joints that realistically accounts for the influence of matedness on their peak shear strength is still lacking. This paper presents a methodology where objective measurements of the average aperture of natural, unfilled rock joints are used to estimate their matedness as a step in the prediction of the peak shear strength. This measured average aperture is based on high-resolution optical scanning of the surface roughness. The proposed relationship between measured average aperture and matedness of natural rock joints has been included in a further developed peak shear strength criterion. The verification against ten natural rock joint samples of coarse-grained granite showed that the revised criterion can predict the peak shear strength considering rock joint matedness. |
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| URL الوصول: | https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-292776 https://doi.org/10.1007/s00603-020-02340-8 |
| قاعدة البيانات: | SwePub |
Find this article in full text from Springer Verlag. | تدمد: | 07232632 1434453X |
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| DOI: | 10.1007/s00603-020-02340-8 |