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<p>To investigate the creep characteristics of water-containing slope rocks in high-cold regions, this study conducted indoor physical and mechanical tests on arkose sandstone specimens, with moisture content and freeze-thaw cycle number as test variables. The test results indicate that under the same stress level, increasing moisture content and freeze-thaw cycle number lead to three key trends: (1) increased instantaneous creep strain of arkose sandstone specimens; (2) decreased long-term creep strength; and (3) intensified material damage. Based on the test data, this study developed and verified a modified Nishihara creep model that incorporates the coupled damage effect of moisture content and freeze-thaw cycle number. This study provides a theoretical basis for predicting the long-term creep behavior of arkose sandstone in water-containing slopes of high-cold regions and preventing slope disasters in open-pit mines.</p>

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Uniaxial creep characteristics and constitutive model of arkose sandstone with different moisture contents under repeated freeze thaw cycles

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年10月29日

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  • Tian Chen,
  • Yanlong Chen,
  • Peng Wu,
  • Xinfeng Cao,
  • Lingyao Kong,
  • Zhiguo Chang

摘要

To investigate the creep characteristics of water-containing slope rocks in high-cold regions, this study conducted indoor physical and mechanical tests on arkose sandstone specimens, with moisture content and freeze-thaw cycle number as test variables. The test results indicate that under the same stress level, increasing moisture content and freeze-thaw cycle number lead to three key trends: (1) increased instantaneous creep strain of arkose sandstone specimens; (2) decreased long-term creep strength; and (3) intensified material damage. Based on the test data, this study developed and verified a modified Nishihara creep model that incorporates the coupled damage effect of moisture content and freeze-thaw cycle number. This study provides a theoretical basis for predicting the long-term creep behavior of arkose sandstone in water-containing slopes of high-cold regions and preventing slope disasters in open-pit mines.