The aim of this paper was to reveal the distribution law of permafrost thermal thawing sensibility and thaw depth caused by road construction in Qinghai-Tibet engineering corridor (QTEC). The prediction models of permafrost thermal thawing sensibility and thaw depth have been developed by incorporating the MODIS and in situ soil temperature observation data. The comprehensive earth-atmosphere-coupled numerical models of different embankment structures have been utilized to calculate the thaw depth of the underlying permafrost foundation. Finally, using the given data and above developed prediction models, the distribution maps of permafrost thermal thawing sensibility and thaw depth in QTEC are obtained by grid calculation. The results show the following: (1) Insensitive permafrost of QTEC mainly distributes in the large-scale mountain and high latitude area, and highly sensitive permafrost is located in the perennial river bed, flood plain, and terrace regions. (2) Road construction has a strong thermal disturbance to underlying permafrost, and the proportion of large thaw depth area of separate embankment is obviously smaller than that of 26 m full-width embankment. (3) Increase of subgrade interval reduces the proportion of large thaw depth areas, and the application of separate embankment structure is an effective engineering means for the Qinghai-Tibet expressway.

中文翻译：

---

基于MODIS数据的青藏工程走廊多年冻土路堤热解冻敏感性和融化深度预测模型。

本文旨在揭示青藏工程走廊（QTEC）道路建设引起的多年冻土热融化敏感性和融化深度的分布规律。通过结合MODIS和现场土壤温度观测数据，建立了多年冻土热融化敏感性和融化深度的预测模型。利用不同路堤结构的综合地-气耦合数值模型来计算下伏多年冻土基础的融化深度。最后，利用给定的数据和以上开发的预测模型，通过网格计算获得了QTEC中多年冻土热融化敏感性和融化深度的分布图。结果显示如下：（1）QTEC的多年冻土主要分布在大型山区和高纬度地区，高度敏感的多年冻土分布在常年河床，洪泛平原和阶地地区。（2）道路施工对下伏多年冻土有强烈的热干扰，单独路堤的大融化深度面积比明显小于26 m全宽度路堤。（3）路基间隔的增加减少了大融化深度区域的比例，而单独的路堤结构的应用是青藏高速公路的有效工程手段。单独路堤的大融化深度面积比明显小于26m全宽度路堤。（3）路基间隔的增加减少了大融化深度区域的比例，而单独的路堤结构的应用是青藏高速公路的有效工程手段。单独路堤的大融化深度面积比明显小于26m全宽度路堤。（3）路基间隔的增加减少了大融化深度区域的比例，而单独的路堤结构的应用是青藏高速公路的有效工程手段。