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

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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.

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Authors and Affiliations

  1. College of Architecture and Civil Engineering, Bei**g University of Technology, Bei**g, 100124, China

    L. F. Fan, B. Qiu & Y. D. Fan

  2. China Nuclear Power Engineering Co. LTD, Bei**g, 100124, China

    J. W. Gao

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  1. L. F. Fan
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  2. B. Qiu
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  3. Y. D. Fan
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  4. J. W. Gao
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Fan, L.F., Qiu, B., Fan, Y.D. et al. Stress-Water Coupling Effects on Failure of Sandstone Based on Real-Time CT Technology. Rock Mech Rock Eng 56, 4329–4341 (2023). https://doi.org/10.1007/s00603-023-03287-2

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