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Rock Mechanics and Rock Engineering

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01.03.2014 | Original Paper

An Experimental Study on the Pre-Peak Unloading Damage Evolution of Marble

verfasst von: Shi-Li Qiu, Xia-Ting Feng, Jian-Qing Xiao, Chuan-Qing Zhang

Erschienen in: Rock Mechanics and Rock Engineering | Ausgabe 2/2014

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Abstract

The behavior of rock damage evolution under unloading conditions is of utmost importance for the analysis of the stress-induced failure of overstressed rock masses. In this paper, a new experimental approach, the incrementally cyclic loading–unloading pressure test (ICLUP test), is designed to quantify stress-induced micro-fracturing and fracturing under the condition of confining pressure reduction. The experimental results demonstrate that the pre-peak damage and deformation characteristics of marble specimens may be easily quantified by irreversible strains, and two damage stages, namely, the linear steady stage and the nonlinear unsteady stage, which are, respectively, represented as a linear steady rate and a nonlinear unsteady rate of damage evolution, occur along with the increase of unloading damage. The new model is proposed to describe the features of pre-peak unloading damage evolution, and the physical meanings and ranges of its material parameters are explained and analyzed. Furthermore, the evolution of volumetric dilation and elastic parameters which occurs along with the increase of unloading damage is revealed. Also discussed in this paper are the inhomogeneity and initial damage of specimens, as well as related research planned to be performed in the future.

Vorheriger Artikel New Peak Shear Strength Criterion of Rock Joints Based on Quantified Surface Description

Nächster Artikel The Effects of Temperature and Pressure on the Porosity Evolution of Flechtinger Sandstone

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Titel: An Experimental Study on the Pre-Peak Unloading Damage Evolution of Marble
verfasst von: Shi-Li Qiu
Xia-Ting Feng
Jian-Qing Xiao
Chuan-Qing Zhang
Publikationsdatum: 01.03.2014
Verlag: Springer Vienna
Erschienen in: Rock Mechanics and Rock Engineering / Ausgabe 2/2014
Print ISSN: 0723-2632
Elektronische ISSN: 1434-453X
DOI: https://doi.org/10.1007/s00603-013-0394-7

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