Long-term thermal regimes of the Qinghai-Tibet Railway embankments in plateau permafrost regions
Long-term thermal regimes of the Qinghai-Tibet Railway embankments in plateau permafrost regions
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DOI：
10.1007/s11430-015-5063-0
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发表时间：
2015-09-01
影响因子：
5.7
通讯作者：
Yin GuoAn
中科院分区：
文献类型：
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作者：
Niu FuJun;Liu MingHao;Yin GuoAn
传统路基与破碎基岩路基的地温场存在明显的不对称性。测量表明，TE和CRBE不利于保持热稳定性。碎石坡堤（CRSE）和u型碎石路堤（UCRE）的地温场是对称的。然而，由于在CRSE下深层冻土变暖缓慢，UCRE的热稳定性优于CRSE。因此，UCRE在降低地温和改善温度场对称性方面具有最佳的长期效果。更一般地说，采用冷却路基原理的施工符合铁路长期稳定性和列车运输速度为100 km h（-1）的设计要求。然而，两肩之间的温差，存在于所有的堤岸肩，可能会导致潜在的不均匀沉降，可能需要维护。
Ten years of ground temperature data (2003-2013) indicate that the long-term thermal regimes within embankments of the Qinghai-Tibet Railway (QTR) vary significantly with different embankment structures. Obvious asymmetries exist in the ground temperature fields within the traditional embankment (TE) and the crushed-rock basement embankment (CRBE). Measurements indicate that the TE and CRBE are not conducive to maintaining thermal stability. In contrast, the ground temperature fields of both the crushed-rock sloped embankment (CRSE) and the U-shaped crushed-rock embankment (UCRE) were symmetrical. However, the UCRE gave better thermal stability than the CRSE because slow warming of deep permafrost was observed under the CRSE. Therefore, the UCRE has the best long-term effect of decreasing ground temperature and improving the symmetry of the temperature field. More generally, it is concluded that construction using the cooling-roadbed principle meets the design requirements for long-term stability of the railway and for train transport speeds of 100 km h(-1). However, temperature differences between the two shoulders, which exist in all embankments shoulders, may cause potential uneven settlement and might require maintenance.