Rock and Soil Mechanics ›› 2023, Vol. 44 ›› Issue (1): 251-258.doi: 10.16285/j.rsm.2022.0295

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Action mechanism between liquid-phase suction and solid-phase ice pressure in frozen soil/rock

CHEN Han-qing1, 2, CHENG Hua1, 3, 4, RONG Chuan-xin1, CAI Hai-bing1, YAO Zhi-shu1   

  1. 1. College of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan, Anhui 232001, China; 2. College of Civil and Transportation Engineering, Shenzhen University, Shenzhen, Guangdong 518060, China; 3. College of Resources and Environment, Anhui University, Hefei, Anhui 230601, China; 4. Anhui Province Key Laboratory of Building Structure and Underground Engineering, Anhui Jianzhu University, Hefei, Anhui 230601, China
  • Received:2022-03-14 Accepted:2022-05-24 Online:2023-01-16 Published:2023-01-13
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (51874005, 51878005, 51778004).

Abstract: In order to study the interaction mechanism between liquid-phase suction and solid-phase ice pressure in frozen soil / rock, the theoretical ice pressure equations under different boundary conditions are first unified according to the fundamental thermodynamics. Then, by combining the generalized Clapeyron equation and the Gibbs-Thomson equation, the freezing temperature equation of liquid phase water at curved interface is given on the basis of interpretation of the physical significance of liquid-phase suction and solid-phase ice pressure. Finally, the freezing temperature equation is introduced into the frozen capillary model, and the liquid-phase suction equation is substituted into Darcy's law to verify the action mechanism of solid-phase ice pressure and liquid-phase suction respectively. The results show that: 1) The theoretical ice pressure in equilibrium state is only linearly related to temperature and has nothing to do with the boundary conditions. 2) The liquid-phase suction stems from the difference between the theoretical suction and the offset factor of solid-phase ice pressure, and it is the unified driving force for water migration, and when the solid-phase ice pressure approaches the theoretical ice pressure, the liquid-phase suction tends to zero. 3) The solid-phase ice pressure is an absolute pressure, which can offset the liquid-phase suction, while the liquid-phase suction is a relative suction and cannot offset the solid-phase ice pressure. 4) The total pressure in the pores is only the solid-phase ice pressure and it can reach the theoretical ice pressure in equilibrium when the capillary is frozen, so it follows the formation mechanism of segregation ice by "ice pressure method". This research reveals the interaction mechanism between liquid-phase suction and solid-phase ice pressure in frozen soil / rock, which has high theoretical value and scientific significance for improving the existing frost heave theory.

Key words: liquid-phase suction, solid-phase ice pressure, theoretical ice pressure, curved interface, freezing temperature

CLC Number: 

  • TU 445
[1] ZHANG Jian-xin, MA Chang-hu, LANG Rui-qing, SUN Li-qiang, YANG Ai-wu, LI Di, . Experimental study on mechanical properties of coastal remolded soft soil subjected to the freeze-thaw cycle under confining pressure [J]. Rock and Soil Mechanics, 2023, 44(7): 1863-1874.
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