The longitudinal cracks have become the main subgrade distress type in the permafrost regions , and there is not a effective solution now 纵向裂缝目前已成为多年冻土地区路基病害的主要类型之一，目前还没有一种有效的解决方法。
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。
Permafrost fracture and ice fracture are both the result of freezing expansion without evident relation to tectonic deformation and regional structures 冻土裂缝和冰裂缝属外营力成因地裂缝，是冻土与冰层不均匀融冻变形的重要表现形式。
In alaska , salmon populations are faltering as melting permafrost pours mud into rivers , burying the gravel the fish need for spawning 在阿拉斯加， ?鱼群的数量正在逐渐减少，因为永久冻土层融化带入大量的泥土到河中，覆盖了?鱼产卵所需的碎石。
For rayleigh wave has great advantages over the project geology investigation , the paper uses it to analyze the permafrost and the reasons for distresses 瑞雷面波仪对于勘探浅层工程地质问题具有优势，本文利用其进行了路基病害原因的测试分析。
The trend of permafrost temperature rise will be gradually restrained by reducing engineering thermal disturbances and soil temperature drop beneath the block - stone embankment 多年冻土温度升高随著工程热扰动的降低和块石路基“冷量”积累，己逐渐被抑制。
The long wait was 15 ) due to a number of 16 ) factors , including the 17 ) challenges of building a railway system over permafrost and at 18 ) altitudes of over 4 , 000 meters 如此漫长的等待归咎于一些因素，包括在冻土及海拔超过4 , 000公尺的高度建筑铁路的困难挑战！
About half of the route is across permafrost , which poses particular challenges because of the danger of subsidence caused by melting at the surface in summer 路线的大半是要穿过永冻土，由于存在夏季土层表面融化而导致的下沉危险，这便给运营带来了特殊的挑战。
Engineers designed bridges to span the most treacherous area of permafrost and sank naturally cooled piping into the ground to keep the track bed frozen year - round , reducing instability 中国铁路建设者们在永冻土地段设计了桥梁，坚固的水泥桥墩深深地埋在永冻土层里，克服了路基不稳定的难题。
