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研究目的:通风管路基作为一种新型的路基结构,具有降低多年冻土地温抬升路基人为上限的性能,对多年冻土区铁路的建设及运营提供安全保证。本文结合青藏高原多年冻土区特殊的气候条件及空气流通特征,对通风管内空气对流形式进行分析,并通过传热学基本理论对多年冻土区通风管路基体的传热规律进行研究。研究结果:文章经过系统分析和研究,提出了青藏高原多年冻土区通风管路基的传热理论。认为青藏高原多年冻土区通风管路基的传热方式主要为空气的强迫对流、自然对流及热传导3种,并通过理论计算及试验得出使通风管路基达到最大功效的合理的长径比。
Research purposes: As a new type of subgrade structure, ventilation pipe embankment has the function of reducing the man-made upper limit of ground temperature rise in permafrost regions and providing safety guarantee for the construction and operation of railway in permafrost regions. Based on the special climatic conditions and air circulation characteristics of the permafrost region on the Qinghai-Tibet Plateau, this paper analyzes the air convection pattern in the ventilation duct and studies the heat transfer law of the ventilation duct body in the permafrost zone through the basic theory of heat transfer. Research results: Through systematical analysis and research, the paper puts forward the heat transfer theory of ventilation pipe foundations in permafrost regions on the Qinghai-Tibet Plateau. It is considered that the heat transfer modes of ventilation pipe foundations in the permafrost region of Qinghai-Tibet Plateau are mainly forced convection, natural convection and heat conduction of air, and the reasonable aspect ratio for maximizing the effectiveness of ventilation pipe foundations is obtained through theoretical calculations and experiments.