路基施工对青藏高原多年冻土的影响

The Effect of Embankment Construction on Permafrost in the Tibetan Plateau

青藏高原上施工会扰动其下多年冻土的存在状态.近些年来,高原上相继修建的大量的线性工程,这些大型工程的建设必将进行多年冻土区的开挖和夯填,从而会引起下伏多年冻土的结构发生很大变化.研究了路基施工对青藏高原多年冻土的影响,并以青藏铁路、青藏公路沿线典型实例进行分析.结果表明:开挖施工扰动最大,可引起斜坡失稳滑塌、地表积水和热融湖塘等;填土路堤会引起其下伏多年冻土升温,路基两侧形成的小气候往往起着提高地面温度的作用;挡水、排水设施施工也会导致多年冻土上限下降,地表沉陷.可见,填土路基、开挖、地表工程扰动都会导致多年冻土发生变化,这些冻土变化对路基稳定必将构成威胁.

Engineering construction may disturb the existing state of permafrost in the Tibetan Plateau. Many linear structures,including highways,gas pipe lines,cable lines,and electrical transfer lines and railways,have been constructed during the past few years,which inevitably have digging and filling processes in the permafrost regions. Such engineering activities along with the temperature rising may change the permafrost configuration and the existing permafrost environment in the Qinghai-Tibet Corridor. In thi...