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Stress-Water Coupling Effects on Failure of Sandstone Based on Real-Time CT Technology.

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Title: Stress-Water Coupling Effects on Failure of Sandstone Based on Real-Time CT Technology.
Authors: Fan, L. F.1 (AUTHOR) fanlifeng@bjut.edu.cn, Qiu, B.1 (AUTHOR), Fan, Y. D.1 (AUTHOR), Gao, J. W.2 (AUTHOR)
Source: Rock Mechanics & Rock Engineering. Jun2023, Vol. 56 Issue 6, p4329-4341. 13p.
Subjects: Sandstone, Pore size distribution, Waterlogging (Soils), Porosity, Computed tomography
Abstract: In rock engineering, the weakening effects of water on the stressed rock are nonnegligible. This paper studied the microstructure deterioration processes of sandstones under stress and stress-water coupling by real-time computed tomography (CT) technology and compared the difference in these two processes. Firstly, the real-time CT tests were performed on the dry and saturated sandstones during the uniaxial compression to study the progressive deterioration of sandstones caused by stress and stress-water coupling, which were further quantitatively described by porosity. Then, the equivalent radius was introduced to analyze the real-time pore structure characteristics of sandstones under stress and stress-water coupling. Finally, the difference in failure patterns of sandstones under stress and stress-water coupling was compared. The results show that the real-time CT images intuitively present the continuous changes of spatial morphology of defects in sandstones under stress and stress-water coupling. During the uniaxial compression, the porosities of dry and saturated sandstones decrease at first, then increase slowly and finally increase rapidly. However, as the increase of stress, the variation in porosity, shifting of pore size distribution curve and change of maximum equivalent radius interval of saturated sandstone are more significant, indicating that even under the same stress state, the water aggravates the microstructure deterioration of sandstone, thus leading to the reduction of bearing capacity of sandstone. In addition, the failed region of saturated sandstone is mainly composed of multiple shear and tensile cracks, which presents the typical tensile-shear composite failure. Highlights: Real-time CT tests were performed on sandstone during uniaxial compression. Real-time progressive failure process of sandstone was observed. Real-time pore distribution characteristic of sandstone was studied. Stress-water coupling effects on failure of sandstone were discussed. [ABSTRACT FROM AUTHOR]
Copyright of Rock Mechanics & Rock Engineering is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Stress-Water Coupling Effects on Failure of Sandstone Based on Real-Time CT Technology.
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  Data: <searchLink fieldCode="JN" term="%22Rock+Mechanics+%26+Rock+Engineering%22">Rock Mechanics & Rock Engineering</searchLink>. Jun2023, Vol. 56 Issue 6, p4329-4341. 13p.
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  Data: <searchLink fieldCode="DE" term="%22Sandstone%22">Sandstone</searchLink><br /><searchLink fieldCode="DE" term="%22Pore+size+distribution%22">Pore size distribution</searchLink><br /><searchLink fieldCode="DE" term="%22Waterlogging+%28Soils%29%22">Waterlogging (Soils)</searchLink><br /><searchLink fieldCode="DE" term="%22Porosity%22">Porosity</searchLink><br /><searchLink fieldCode="DE" term="%22Computed+tomography%22">Computed tomography</searchLink>
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  Data: In rock engineering, the weakening effects of water on the stressed rock are nonnegligible. This paper studied the microstructure deterioration processes of sandstones under stress and stress-water coupling by real-time computed tomography (CT) technology and compared the difference in these two processes. Firstly, the real-time CT tests were performed on the dry and saturated sandstones during the uniaxial compression to study the progressive deterioration of sandstones caused by stress and stress-water coupling, which were further quantitatively described by porosity. Then, the equivalent radius was introduced to analyze the real-time pore structure characteristics of sandstones under stress and stress-water coupling. Finally, the difference in failure patterns of sandstones under stress and stress-water coupling was compared. The results show that the real-time CT images intuitively present the continuous changes of spatial morphology of defects in sandstones under stress and stress-water coupling. During the uniaxial compression, the porosities of dry and saturated sandstones decrease at first, then increase slowly and finally increase rapidly. However, as the increase of stress, the variation in porosity, shifting of pore size distribution curve and change of maximum equivalent radius interval of saturated sandstone are more significant, indicating that even under the same stress state, the water aggravates the microstructure deterioration of sandstone, thus leading to the reduction of bearing capacity of sandstone. In addition, the failed region of saturated sandstone is mainly composed of multiple shear and tensile cracks, which presents the typical tensile-shear composite failure. Highlights: Real-time CT tests were performed on sandstone during uniaxial compression. Real-time progressive failure process of sandstone was observed. Real-time pore distribution characteristic of sandstone was studied. Stress-water coupling effects on failure of sandstone were discussed. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Rock Mechanics & Rock Engineering is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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      – SubjectFull: Waterlogging (Soils)
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              Text: Jun2023
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