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Experimental Study on the Mechanical Behavior of Yunnan Limestone in Natural and Saturated States

Advances in Civil Engineering, 2021-02, Vol.2021, p.1-16

Copyright © 2021 Xutao Zhang et al. ;COPYRIGHT 2021 Hindawi Limited ;Copyright © 2021 Xutao Zhang et al. This is an open access article distributed under the Creative Commons Attribution License (the “License”), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License. https://creativecommons.org/licenses/by/4.0 ;ISSN: 1687-8086 ;EISSN: 1687-8094 ;DOI: 10.1155/2021/6614412

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Title:
Experimental Study on the Mechanical Behavior of Yunnan Limestone in Natural and Saturated States
Author: Zhang, Xutao ; Ren, Mingyang ; Meng, Zhaobo ; Zhang, Baoliang ; Li, Jinglong
Zhou, Gang ; Gang Zhou
Subjects: Analysis ; Civil engineering ; Compressive strength ; Confining ; Constitutive models ; Criteria ; Dynamic testing ; Elastic deformation ; Elastic properties ; Engineering ; Failure modes ; Heterogeneity ; Hyperbolic functions ; Laboratories ; Laboratory tests ; Limestone ; Materials ; Mechanical analysis ; Mechanical properties ; Minerals ; Modulus of deformation ; Modulus of elasticity ; Moisture content ; Mountain tunnels ; Poisson's ratio ; Pressure dependence ; Residual strength ; Rock deformation ; Rock mechanics ; Scanning electron microscopy ; Shear ; Shear tests ; Stability analysis ; Stiffness ; Stone ; Tensile strength ; Test systems ; Testing
Is Part Of: Advances in Civil Engineering, 2021-02, Vol.2021, p.1-16
Description: Rock material is a kind of mineral assemblage with complex structural heterogeneity, whose mechanical behavior is strongly affected by water or moisture content. In this work, we carried out a series of laboratory tests to investigate the mechanical response (e.g., deformation, strength, and failure characteristics) of Yunnan limestone in natural and saturated states. Our test results show that (1) after saturation, the stiffness and strength of Yunnan limestone degenerate considerably. Compared with the natural condition, the elastic modulus, deformation modulus, and tensile modulus decrease by about 30% on average, and uniaxial compressive strength and tensile strength also decrease by about 15% and 20%, respectively. While Poisson’s ratio is less affected by water content, it can be regarded as a constant; (2) the elastic modulus and deformation modulus of Yunnan limestone are significantly affected by confining pressure, and the relationship between them and confining pressure satisfies the law of hyperbolic function; (3) the peak strength envelope of Yunnan limestone has significant nonlinear characteristics, which can be well described by generalized Hoek-Brown strength criterion. However, the generalized Hoek-Brown criterion does not apply to the residual strength, which shows a linearly increasing trend with the increasing confining pressure; (4) the failure modes of Yunnan limestone are significantly dependent on confining pressure but insensitive to water content. With the increasing confining pressure, the failure modes of Yunnan limestone transform from splitting failure, tension-shear mixed failure, single inclined plane shear failure to Y-shaped or X-shaped conjugated shear failure. The test results can provide important experimental data for the establishment of the constitutive model of Yunnan limestone, which will contribute to obtain more reliable results for stability assessment of Xianglu Mountain Tunnel.
Publisher: New York: Hindawi
Language: English
Identifier: ISSN: 1687-8086
EISSN: 1687-8094
DOI: 10.1155/2021/6614412
Source: Directory of Open Access Journals
ROAD: Directory of Open Access Scholarly Resources
ProQuest Central

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Experimental Study on the Mechanical Behavior of Yunnan Limestone in Natural and Saturated States

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