1.宁夏大学 土木与水利工程学院,宁夏 银川 750021
2.宁夏节水灌溉与水资源调控工程技术研究中心,宁夏 银川 750021
3.旱区现代农业水资源高效利用教育部工程研究中心,宁夏 银川 750021
唐少容(1982—),女,副教授,博士,主要从事寒旱区水工结构与岩土工程方面的科研与教学工作(tangsrong@126.com)。
收稿:2023-04-24,
纸质出版:2026-03-25
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唐少容,刘锦豪,李昊天,等.冻融过程中煤渣-相变材料对粉砂土温度分布的影响[J].西北工程技术学报(中英文),2026,25(1):58-62.
TANG Shaorong,LIU Jinhao,LI Haotian,et al.Experimental Study on Temperature Distribution of Silty Sand Improved by Cinder and Phase Change Material During Freeze-Thaw Process[J].Journal of Northwest Engineering Technology,2026,25(01):58-62.
唐少容,刘锦豪,李昊天,等.冻融过程中煤渣-相变材料对粉砂土温度分布的影响[J].西北工程技术学报(中英文),2026,25(1):58-62. DOI: 10.26974/j.cnki.XBGC.2026.01.008.
TANG Shaorong,LIU Jinhao,LI Haotian,et al.Experimental Study on Temperature Distribution of Silty Sand Improved by Cinder and Phase Change Material During Freeze-Thaw Process[J].Journal of Northwest Engineering Technology,2026,25(01):58-62. DOI: 10.26974/j.cnki.XBGC.2026.01.008.
为了研究相变材料(phase change material,PCM)在冻融过程中对渠道土体温度场的影响和作用机理,分别利用石蜡基PCM和煤渣,制备石蜡基PCM改良土和煤渣-石蜡基PCM改良土,开展相变材料改良土体的单向冻融试验,分析土柱各层温度随着时间的变化。结果表明:改良土各土层间温度梯度减小,升降温速率减缓;冻结结束后,粉砂土土柱整体土层已降至0 ℃以下,石蜡基PCM改良土土柱距离柱顶约16 cm范围内的土层温度低于0 ℃,煤渣-石蜡基PCM改良土土柱距离柱顶约8 cm范围内的土层温度低于0 ℃,土柱顶端达到0 ℃的时间依次约为13,16,19 h。石蜡基PCM具有延缓土体冻融时间的作用,尤其是利用煤渣进行二次改良后,煤渣大量吸附石蜡基PCM,延迟作用更加明显;加入石蜡基PCM后,外部温度剧烈变化对土层的影响降低,土体温度场被调整得更为均匀。
In order to study the influence and mechanism of phase change material (PCM) on the temperature field of channel soil during the freeze-thaw process, paraffin-based PCM and cinder were used to prepare paraffin-based PCM modified soil (PMS) and cinder-paraffin-based PCM modified soil (CPMS). One-way freeze-thaw tests were conducted on the modified soils to analyze the temperature variation of the soil column over time. The results show that the temperature gradient between different layers of the modified soils decreases, and the rate of temperature change slows down. After the freezing process, the entire silty sand column reaches a temperature below 0 ℃. The temperature of the soil layer within about 16cm from the top of the PMS column drops below 0 ℃, while for the CPMS column, this occurs within approximately 8 cm from the top. The times taken for the top of the soil columns to reach 0 ℃ are about 13, 16 and 19 h for plain soil, PMS, and CPMS, respectively. The paraffin-based PCM effectively extends the duration of the freeze-thaw cycle in the soil, and this effect is significantly enhanced after incorporating cinder, which adsorbs a large amount of the PCM. Additionally, the influence of drastic changes in external temperature on the soil layers is mitigated, resulting in a more uniform temperature field within the soil.
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