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<p>In cold regions, freezing and thawing disasters occur frequently; such disasters include lining cracking, track bed heave, and slope collapse. Studies have shown that freezing damage is directly controlled by the migration of unfrozen water. However, research on water migration primarily focuses on frozen soil and less attention is paid to fractured rock masses. In this paper, on the basis of the definition of the equivalent hydraulic width of fracture (EHWF) and the cubic law of seepage, the EHWF evolution equation and a seepage model of a single fracture in a low-temperature rock mass are established considering the influences of the temperature, phase change, chemistry, and mechanics. Then, in accordance with the adsorption-film theory, an equation for the equilibrium water pressure of the unfrozen water film in fractures is proposed and a driving potential model of the unfrozen water migration is established. Finally, by introducing the influences of the fracture distribution parameters, an anisotropic water migration model of a low-temperature fractured rock mass is established and the influence of temperature on the EHWF and equilibrium water pressure is discussed. The model established in this paper can improve the multi-field coupling theory of fractured rock masses at low temperatures.</p>

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Water Migration Model for Low-Temperature Saturated Rock Masses

  • 期刊论文

  • 发表日期：

    2025年3月1日

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  • Naifei Liu,
  • Ning Li,
  • Shuangjie Wang,
  • Guofeng Li,
  • Zhanping Song,
  • Lei Zhang

摘要

In cold regions, freezing and thawing disasters occur frequently; such disasters include lining cracking, track bed heave, and slope collapse. Studies have shown that freezing damage is directly controlled by the migration of unfrozen water. However, research on water migration primarily focuses on frozen soil and less attention is paid to fractured rock masses. In this paper, on the basis of the definition of the equivalent hydraulic width of fracture (EHWF) and the cubic law of seepage, the EHWF evolution equation and a seepage model of a single fracture in a low-temperature rock mass are established considering the influences of the temperature, phase change, chemistry, and mechanics. Then, in accordance with the adsorption-film theory, an equation for the equilibrium water pressure of the unfrozen water film in fractures is proposed and a driving potential model of the unfrozen water migration is established. Finally, by introducing the influences of the fracture distribution parameters, an anisotropic water migration model of a low-temperature fractured rock mass is established and the influence of temperature on the EHWF and equilibrium water pressure is discussed. The model established in this paper can improve the multi-field coupling theory of fractured rock masses at low temperatures.