Study on thermal diffusion characteristics and influence range of an artificial heat source inside embankment in cold regions
HU Tianfei1，2，WANG Li3，YUE Zurun1，2，XU Lixia3，LIU Jihua3
(1. State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures，Shijiazhuang Tiedao University，Shijiazhuang，Hebei 050043，China；2. Key Laboratory of Mechanical Behavior Evolution and Control of
Traffic Engineering Structures in Hebei，Shijiazhuang Tiedao University，Shijiazhuang，Hebei 050043，China；
3. School of Civil Engineering，Shijiazhuang Tiedao University，Shijiazhuang，Hebei 050043，China)
Abstract：In order to address the frost heave problem of railway embankment in cold regions，an artificial heating system and a distributed heating scheme based on ground source heat pump technology was proposed. A full scale half-width embankment test platform of class I single-track railway was built，and the temperature field of embankment was monitored. The effective heating influence radius of the heating system was defined as the longitudinal range within which the embankment freezing depth is controlled below the harmful threshold within a certain time，and a prediction method of the effective heating influence radius was put forward. The test results show that the heating temperature of the heat pump system can reach above 30 ℃，the coefficient of performance(COP) can be as high as 6.9，and both the effective heating capacity and COP gradually decrease with time. The temperature rise amplitude of soil decreases with the distance from heat source，and the temperature increment rate in the vertical direction around the heating pipe is greater than that in the longitudinal direction along embankment. Artificial heating has a significant inhibitory effect on the impact of cold wave weather. At the end of the test，the freezing depth within 2.0 and 3.0 m on both sides of the heating system is controlled within 30 and 35 cm respectively. The heating influence radius is proportional to both heating time and the harmful freezing depth threshold. When the harmful freezing depth threshold is 30，35，40 cm，the effective heating influence radius is 0.44 m，0.64 m，0.83 m respectively when heating for 5 days；and if the heating influence radius needs to reach 1.5 m，the heating time should be 53，41，35 d respectively. In application，the longitudinal layout spacing of heating systems along the embankment should be reasonably designed according to the harmful freezing depth threshold and the required treatment time after the appearance of frost heave，so as to ensure the merge of thawing range of adjacent heating systems within the specified time.
胡田飞1，2，王 力3，岳祖润1，2，徐丽霞3，刘济华3. 人工热源在寒区路基中的热扩散特性及热影响范围研究[J]. 岩石力学与工程学报, 2023, 42(S1): 3687-3699.
HU Tianfei1，2，WANG Li3，YUE Zurun1，2，XU Lixia3，LIU Jihua3. Study on thermal diffusion characteristics and influence range of an artificial heat source inside embankment in cold regions. , 2023, 42(S1): 3687-3699.
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