Cooling Performance of a Novel Ventilated Slope on Railbed in Permafrost Regions

IF 3 3区地球科学 Q2 GEOGRAPHY, PHYSICAL

Permafrost and Periglacial Processes Pub Date : 2024-03-25 DOI:10.1002/ppp.2222

Zhenyu Zhang, Zhi Wen, Youqian Liu, Xinbin Wang, Jinxin Lu, Kun Chen, Delong Zhang, Qihao Yu

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Abstract

The heat absorption of the railbed mainly originates from the embankment slope in permafrost regions. A novel ventilated slope (NVS) with a double‐layer convection channel is proposed and verified. By applying this method to the Qinghai–Tibet Railway (QTR), the annual average temperature at the 10 cm depth below the embankment slope surface under NVS was reduced by 4.95°C. The freezing index at the 10 cm depth of NVS was 1.78 times higher than that of the slope without any cooling approaches. The numerical simulation results showed that heat was accumulated for the conventional embankment, while heat was released from the railbed after the application of NVS. With the cooling effect of NVS, the 0°C isotherm would rise above the original natural ground surface in the 2nd year after the embankment construction. A low‐temperature region of −2°C would be observed in the underlying permafrost by the 10th year. The underlying permafrost would remain frozen in the 50th year. This study provides a novel method for protecting the underlying permafrost in permafrost regions.

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永冻地区铁路路基上新型通风斜坡的冷却性能

在冻土地区，铁路路基的吸热主要来自路堤边坡。本文提出并验证了一种具有双层对流通道的新型通风边坡（NVS）。将该方法应用于青藏铁路（QTR）后，NVS 下路堤坡面以下 10 厘米深度的年平均温度降低了 4.95°C。与未采取任何降温措施的边坡相比，无降温措施下 10 厘米深处的冰冻指数高出 1.78 倍。数值模拟结果表明，传统路堤会积聚热量，而在使用 NVS 后，铁路路基会释放热量。在 NVS 的冷却作用下，0°C 等温线将在堤坝建成后的第二年升至高于原始自然地表。到第 10 年，地下冻土层将出现-2°C 的低温区。到第 50 年时，下层冻土仍将处于冻结状态。这项研究为保护永久冻土地区的下层永久冻土提供了一种新方法。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Permafrost and Periglacial Processes 地学-地质学

CiteScore

9.70

自引率

8.00%

发文量

审稿时长

>12 weeks

期刊介绍： Permafrost and Periglacial Processes is an international journal dedicated to the rapid publication of scientific and technical papers concerned with earth surface cryogenic processes, landforms and sediments present in a variety of (Sub) Arctic, Antarctic and High Mountain environments. It provides an efficient vehicle of communication amongst those with an interest in the cold, non-glacial geosciences. The focus is on (1) original research based on geomorphological, hydrological, sedimentological, geotechnical and engineering aspects of these areas and (2) original research carried out upon relict features where the objective has been to reconstruct the nature of the processes and/or palaeoenvironments which gave rise to these features, as opposed to purely stratigraphical considerations. The journal also publishes short communications, reviews, discussions and book reviews. The high scientific standard, interdisciplinary character and worldwide representation of PPP are maintained by regional editorial support and a rigorous refereeing system.

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