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Permafrost Change and Stability of Qinghai-Tibet Highway

Wu Qingbai and Tong changjiang (LanzhouInstiute of Glaciology and Geocryology. Chinese Academy of Sciences. 730000)  
Climate Warming and human activity bring out a great influence on permafrost along Qinghai-Tibet highway. For example, the temperature of permafrost rises, the thickoness of permafrost eliminate, disconhnuous permafrost retreats toward north and so on. These changes seriously disturb and affect the stability of Qinghai-Tibet highway. Meanwhile, considering these changes and engineering stability, the stability of Qinghai-Tibet highway is divided into six zones: 1) very stable zone; 2) stable zone; 3) basically stable zone; 4) basically stable passing zone, 5) unstable zone; 6)extreme unstable zone.
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