Monitoring and analysis of cooling effect of block-stone embankment for Qinghai-Tibet Railway
Monitoring and analysis of cooling effect of block-stone embankment for Qinghai-Tibet Railway
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发表时间：
2005
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通讯作者：
Zhang Lu-xin
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作者：
Zhang Lu-xin
块石路基是青藏铁路保护多年冻土最重要的工程措施之一，约60%的青藏铁路多年冻土区采用了块石路基，通过对青藏铁路块石路基下地温的监测分析，结果表明，块石路基对路基起到了积极的降温作用，而且会引起多年冻土温度的升高，通过减少工程热扰动和块石路基下土体温降，将逐渐抑制多年冻土温度升高的趋势，对于寒冷的多年冻土，在块石路基下多年冻土上限附近温度大幅度降低的情况下，将形成较好的热稳定状态，但是，即使多年冻土上限大大提高了土体的年热不平衡和升温过程，也不利于多年冻土的热稳定性，因此，块石路基结构的适用性值得探讨，以便采取相应的措施解决温暖多年冻土地区路基的稳定性问题。
Block-stone embankment is one of the most important engineering measure for protecting permafrost of Qinghai-Tibet Railway which has been used in about 60% sections of warm permafrost with high ice content.After monitoring analysis of soil temperature beneath the block-stone embankment of Qinghai-Tibet Railway,it can be concluded that the block-stone embankment is working positively for cooling the roadbed and making the great rise of permafrost table,but also causing a temperature rise of permafrost.The trend of permafrost temperature rise will be gradually restrained by reducing engineering thermal disturbances and soil temperature drop beneath the block-stone embankment.And,for cold permafrost,a better thermal stability situation will be developed under the condition that the temperature near the permafrost table beneath the block-stone embankment has largely dropped.But,even the permafrost table has highly raised the annual thermal imbalance of soil and the process of temperature rise,it is disadvantageous for the thermal stability of permafrost.Thus,the applicability of block-stone embankment structure is worth to be discussed in order to take corresponding measures to solve the stability problems of embankment in warm permafrost regions.