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Effects of different fluids on microcrack propagation in sandstone under true triaxial loading conditions.

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Title: Effects of different fluids on microcrack propagation in sandstone under true triaxial loading conditions.
Authors: Hu, Shaobin1 hsbcumt@126.com, Li, Xiaochun2, Bai, Bing2
Source: Greenhouse Gases: Science & Technology. Apr2018, Vol. 8 Issue 2, p349-365. 17p.
Subject Terms: *Geotechnical engineering, *Engineering geology, Fluid dynamics, Dynamical systems, Fluid mechanics
Abstract: Abstract: The mechanical behavior of rock under conditions of multiphase fluids is currently a key scientific issue in the field of geotechnical engineering. In this work, we conducted triaxial compression experiments of initially water‐saturated samples, which were flooded with CO2 using the semipermeable separator method; comparatively investigated the mechanical behaviors of sandstone under the conditions of mono‐phase fluids CO2/N2/H2O and biphase fluid CO2‐H2O; and analyzed the stress‐strain characteristics, internal crack expansion, and macrocrack failure patterns of sandstones. Compared with H2O, CO2 and N2 could lead sandstone cracks to show a pattern of multiple fractures, displaying a double shear failure mode and multiple branch cracks along principal fractures. Moreover, the cracking effect of supercritical CO2 was more evident. Under the conditions of pore pressure of 10 MPa and temperature of 323 K, the ratio of work done by CO2, N2 and H2O during crack expansion was 23.5:24.1:1, with transient pressure drops to 7.82 MPa, 9.25 MPa, and 0.1 MPa, respectively. Overall, the study analyzed the mechanisms of physicochemical interactions of fluid types and the number of phases in sandstone minerals at the microscale and revealed the mechanical mechanism between fluids and rock minerals, as well as the impacts of these fluids on the strength, internal crack expansion and deformation of sandstone. © 2017 Society of Chemical Industry and John Wiley & Sons, Ltd. [ABSTRACT FROM AUTHOR]
Copyright of Greenhouse Gases: Science & Technology is the property of Wiley-Blackwell 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: Effects of different fluids on microcrack propagation in sandstone under true triaxial loading conditions.
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  Data: <searchLink fieldCode="AR" term="%22Hu%2C+Shaobin%22">Hu, Shaobin</searchLink><relatesTo>1</relatesTo><i> hsbcumt@126.com</i><br /><searchLink fieldCode="AR" term="%22Li%2C+Xiaochun%22">Li, Xiaochun</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Bai%2C+Bing%22">Bai, Bing</searchLink><relatesTo>2</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Greenhouse+Gases%3A+Science+%26+Technology%22">Greenhouse Gases: Science & Technology</searchLink>. Apr2018, Vol. 8 Issue 2, p349-365. 17p.
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  Data: *<searchLink fieldCode="DE" term="%22Geotechnical+engineering%22">Geotechnical engineering</searchLink><br />*<searchLink fieldCode="DE" term="%22Engineering+geology%22">Engineering geology</searchLink><br /><searchLink fieldCode="DE" term="%22Fluid+dynamics%22">Fluid dynamics</searchLink><br /><searchLink fieldCode="DE" term="%22Dynamical+systems%22">Dynamical systems</searchLink><br /><searchLink fieldCode="DE" term="%22Fluid+mechanics%22">Fluid mechanics</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Abstract: The mechanical behavior of rock under conditions of multiphase fluids is currently a key scientific issue in the field of geotechnical engineering. In this work, we conducted triaxial compression experiments of initially water‐saturated samples, which were flooded with CO2 using the semipermeable separator method; comparatively investigated the mechanical behaviors of sandstone under the conditions of mono‐phase fluids CO2/N2/H2O and biphase fluid CO2‐H2O; and analyzed the stress‐strain characteristics, internal crack expansion, and macrocrack failure patterns of sandstones. Compared with H2O, CO2 and N2 could lead sandstone cracks to show a pattern of multiple fractures, displaying a double shear failure mode and multiple branch cracks along principal fractures. Moreover, the cracking effect of supercritical CO2 was more evident. Under the conditions of pore pressure of 10 MPa and temperature of 323 K, the ratio of work done by CO2, N2 and H2O during crack expansion was 23.5:24.1:1, with transient pressure drops to 7.82 MPa, 9.25 MPa, and 0.1 MPa, respectively. Overall, the study analyzed the mechanisms of physicochemical interactions of fluid types and the number of phases in sandstone minerals at the microscale and revealed the mechanical mechanism between fluids and rock minerals, as well as the impacts of these fluids on the strength, internal crack expansion and deformation of sandstone. © 2017 Society of Chemical Industry and John Wiley & Sons, Ltd. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Greenhouse Gases: Science & Technology is the property of Wiley-Blackwell 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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        Value: 10.1002/ghg.1744
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        Text: English
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        PageCount: 17
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        Type: general
      – SubjectFull: Engineering geology
        Type: general
      – SubjectFull: Fluid dynamics
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      – SubjectFull: Dynamical systems
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      – SubjectFull: Fluid mechanics
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      – TitleFull: Effects of different fluids on microcrack propagation in sandstone under true triaxial loading conditions.
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            NameFull: Hu, Shaobin
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              M: 04
              Text: Apr2018
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              Y: 2018
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            – TitleFull: Greenhouse Gases: Science & Technology
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