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Rock Mechanics and Rock Engineering

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19.09.2016 | Original Paper

A Fractal Model for the Shear Behaviour of Large-Scale Opened Rock Joints

verfasst von: Y. Li, J. Oh, R. Mitra, I. Canbulat

Erschienen in: Rock Mechanics and Rock Engineering | Ausgabe 1/2017

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Abstract

This paper presents a joint constitutive model that represents the shear behaviour of a large-scale opened rock joint. Evaluation of the degree of opening is made by considering the ratio between the joint wall aperture and the joint amplitude. Scale dependence of the surface roughness is investigated by approximating a natural joint profile to a fractal curve patterned in self-affinity. Developed scaling laws show the slopes of critical waviness and critical unevenness tend to flatten with increased sampling length. Geometrical examination of four 400-mm joint profiles agrees well with the suggested formulations involving multi-order asperities and fractal descriptors. Additionally, a fractal-based formulation is proposed to estimate the peak shear displacements of rock joints at varying scales, which shows a good correlation with experimental data taken from the literature. Parameters involved in the constitutive law can be acquired by inspecting roughness features of sampled rock joints. Thus, the model can be implemented in numerical software for the stability analysis of the rock mass with opened joints.

Vorheriger Artikel Strength/Brittleness Classification of Igneous Intact Rocks Based on Basic Physical and Dynamic Properties

Nächster Artikel Identification of Stress Change Within a Rock Mass Through Apparent Stress of Local Seismic Events

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Titel: A Fractal Model for the Shear Behaviour of Large-Scale Opened Rock Joints
verfasst von: Y. Li
J. Oh
R. Mitra
I. Canbulat
Publikationsdatum: 19.09.2016
Verlag: Springer Vienna
Erschienen in: Rock Mechanics and Rock Engineering / Ausgabe 1/2017
Print ISSN: 0723-2632
Elektronische ISSN: 1434-453X
DOI: https://doi.org/10.1007/s00603-016-1088-8

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