Frost swelling pressure evolution and distribution characteristics in water-saturated fractured sandstone
LIU Yong1, LIU Manman1, LIU Lv2, CHEN Jian2, HUANG Dong3
(1. State Key Laboratory of Water Resources Engineering and Management, Wuhan University, Wuhan, Hubei 430072, China; 2. School of Civil and Hydraulic Engineering, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China;
3. Wuhan Municipal Construction Group Co., Ltd., Wuhan, Hubei 430048, China)
Abstract：Freeze-thaw action is a primary factor contributing to crack propagation in rocks within seasonally frozen regions. To elucidate the distribution and spatial evolution of frost swelling pressure during the ice-water phase transition, freeze-thaw cycle tests were conducted on sandstones featuring a single open crack. A distributed pressure sensor was employed to monitor the values and distribution status of frost swelling pressure in real time, thereby overcoming the limitation of single-point pressure sensors that cannot accurately reflect the distribution of frost swelling pressure along the crack surface. The study investigated the evolution and distribution characteristics of frost swelling pressure, while also exploring the influence of crack depth and width on these parameters. The experimental results indicate that the frost swelling pressure curve can be categorized into five distinct stages: incubation, explosion, drop, dissipation, and disappearance. In the absence of cracks, the frost swelling pressure increases with greater crack depth and width; however, the effect of crack size on frost swelling pressure is relatively minor when cracks are present. The distribution of frost swelling pressure on the crack surface is uneven and varies with freezing duration. For deep cracks, frost swelling pressure is generated at the top of the crack, and the distribution area shifts downward as freezing progresses.
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2025, Vol. 44 
