Mechanism and prevention of deformation cracks of embankments in the permafrost region along qinghai - xizang railway 青藏铁路多年冻土区路基变形裂缝发生机理及其防治
Numerical heat transfer analysis and optimization for thermosyphons coupled with natural ground in permafrost regions 多年冻土区天然地面耦合热管的数值传热分析及优化
Engineering damages of embankment in permafrost regions are mainly caused by thaw settlement of permafrost 摘要多年冻土区道路病害主要是由路基下冻土温度升高融化下沉引起。
Analysis of difference in thermal state between south faced slope and north faced slope of railway embankment in permafrost region 多年冻土区铁路路基阴阳坡面热状况差异分析
In this paper , the method of 2 - d finite element analysis was conducted to simulate the thermal state of the roadbed with insulations on permafrost 本文运用有限元分析方法，对多年冻土区含保温夹层的路基温度场进行了数值模拟。
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 块石路基结构在高温多年冻土区适应性问题仍值得讨论，应采取相对应的补强措施，确保高温多年冻土区路基稳定性。
Roadbed construction on permafrost will give substantial disturb for the heat and mass transfer balance between the ground surface and atmosphere , usually , roadbed construction increases the amount of absorbed heat via vegetation removal , solar radiation and increased role of water activities in the adjoining area , then cause the local degradation of the permafrost underneath , as a result may lead to damage of the roadbed 多年冻土区道路的修筑，改变了原来天然地表与外界的热交换关系，通常由于地面植被的破坏、太阳辐射和水的影响，导致进入地层中的热量增加，引起多年冻土区冻土的融化，从而导致路基面破坏。
The results demonstrate that the upper limit of permafrost in this area had declined from 1970s to the middle phase of 1990 , and permafrost has appeared degenerate tendecy , but since middle 1990s , permafrost have a stable state ; ground temperature of roadbed near the earth surface is higher than that of the natural ground , thawing time of roadbed near the earth surface is longer than that of the natural ground , the heat income within the permafrost is greater than the heat release from the permafrost during anannual period , the heat accumulation within the permafrost is temporarily appeared as temperature rising , but with the heat accumulation within permafrost growing up year by year , permafrost temperature will become higher gradually , and strong thawing of permafrost could be happened in the region 结果表明：风火山地区从20世纪70年代到90年代中期冻土上限下降，冻土出现退化现象，从90年代至今冻土趋于稳定；路基近地表地温明显高于对应天然地表下的地温，路基近地表经历的融化期长于对应天然地表，进入多年冻土区的热收支也呈现出吸热明显大于放热的周期性变化，进入多年冻土的热积累暂时以增高地温耗热为主，但随着冻土吸热量的逐年积累、冻土温度的不断升高，本区冻土可能发生强烈融化。
Results showed that the temperature distribution of the traditional embankment was asymmetrical ; the asymmetrical status was changed after ripped - rock revetment was installed and the soil under the ripped - rock was cooled obviously ; the ripped - rock revetment could cool embankment and adjust the temperature difference between the north - facing slope and the south - facing slope ; the ripped - rock revetment was an available technique to protect embankment from thawing settlement and longitudinal cracks in permafrost regions 结果表明：普通路基的阴阳坡两侧温度分布极不对称；铺设抛石护坡后，这种状况得到了很大改善，并且抛石护坡下土体温度明显降低；抛石护坡能够降低路基温度和调节路基阴阳坡的温度差异；抛石护坡是多年冻土区防治路基融沉和纵向裂缝病害的一种可行措施。
In permafrost areas , thaw - settlement problem is the main content for the frozen harmfulness study ; in the seasonally frozen soil areas , frozen expansion problem is considered most in order to prevent and father the frozen harmfulness for the groundwork , the thaw - settlement index is thought little relatively , but it has been investigated from the data of frozen harmfulness , the thaw - settlement behavior still has an active effect on the construction stability in the seasonally frozen soil areas 在多年冻土区,融沉问题是冻害研究的主要内容;在季节冻土地区,为了防治地基冻害问题,考虑最多的往往是冻胀问题,对融沉指标一般考虑的比较少,但是根据调查冻害资料来看,融沉性在季节冻土地区的建筑物稳定性方面的应用仍然具有积极的意义。
