Ground source heat pump heating of embankments in cold regions to eliminate frost heave
HU Tianfei1,2, WANG Li3
1. State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures, Shijiazhuang Tiedao University, Shijiazhuang 050043, China; 2. Key Laboratory of Mechanical Behavior Evolution and Control of Traffic Engineering Structures in Hebei, Shijiazhuang Tiedao University, Shijiazhuang 050043, China; 3. School of Civil Engineering, Shijiazhuang Tiedao University, Shijiazhuang 050043, China
Abstract：A ground source heat pump system was designed for heating embankments to eliminate frost heave. Tests showed that the device can automatically output heating temperatures of 40, 50, or 60℃ with coefficients of performance greater than 3.0. The heating influenced a 0.76 m radius region on the 1st day, 1.64 m on the 5th day, and 2.30 m on the 10th day. A case study showed that the central freezing depth of an embankment was 0.89 m for standard conditions but was reduced to less than 0.2 m with artificial heating. The soil temperature rise and the heat diffusion both increased with increased heating temperature. Rapid thawing and emergency rescues during frost heave conditions require that the heat pumps have longitudinal spacings along the embankment of 2.0-4.0 m and heating capacities of 1.0-2.0 kW.
胡田飞, 王力. 寒区路基地源热泵系统冻胀防控效果[J]. 清华大学学报（自然科学版）, 2022, 62(5): 871-880.
HU Tianfei, WANG Li. Ground source heat pump heating of embankments in cold regions to eliminate frost heave. Journal of Tsinghua University(Science and Technology), 2022, 62(5): 871-880.
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2022, Vol. 62 
