青藏铁路热棒试验路基裂缝形成原因分析

热棒作为一种汽液两相对流换热装置，具有无能耗、高效率地降低棒周地温的特点．热棒对降低基底地温、增加地基冷储量，保护多年冻土具有较明显的效果．但是，热棒路基在暖季和寒季均有裂缝产生．文中对热棒路基裂缝的特点、形成原因及其对路基稳定性的影响进行了初步分析，并对下一步的研究工作提出了建议．

AN ANALYSIS OF THE CAUSES OF CRACK FORMATION IN THE THERMAL PROBE TEST SUBGRADE OF THE QINGHAI-TIBET RAILWAY

As a two|phase liquid/vapor convection heat|change system, the thermal probe is able to reduce efficiently the ground temperature around it without energy loss. It has ovbions effects in reducing the ground temperature of the base, increasing its cool reserves and protecting permafrost. But, the thermal probe subgrade can give rise to cracks both in warm and cold seasons. A preliminary analysis is made on the characteristics and causes of formation of the cracks in the thermal probe subgrade and their influence on the stability of the rail, and finally some suggestions for the future are also given.