冻土变化与青藏公路的稳定性问题

Permafrost Change and Stability of Qinghai-Tibet Highway

气候转暖和人类活动对青藏公路沿线的多年冻土产生了很大影响，使多年冻土地温升高，厚度减薄，岛状多年冻土向北推移等，这些变化严重地于扰和影响了青藏公路的稳定性。考虑到这些变化和工程稳定性，青藏公路稳定性可分为６个带：极不稳定带；稳定带；基本稳定带；基本稳定过渡带；不稳定带；极不稳定带．

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.