论青藏铁路修筑中的冻土环境保护问题

本文通过研究已建青藏公路修筑过程中寒区冻土环境和生态环境的破坏特征，分析总结了寒区环境破坏对公路工程的影响。青藏公路工程修建活动极大地改变了冻土环境，使得多年冻土退化，上限加深，诱发了一系列冻胀、融沉、热融滑塌等冻融灾害，使得生态环境原本就很脆弱的寒区环境更加恶化，如植被退化、荒漠化等，同时，冻土环境的破坏也使得工程环境恶化，直接影响青藏公路正常交通运输。因此，在即将进行的青藏铁路修筑工程中，必须深入研究其对冻土环境的影响，对冻土环境问题和环境保护应予以足够的重视。

Discussion on the environmental protection of frozen soil during the Qinghai-Tibet railway construction

According to the destruction of the frozen soil and the ecological environment during the Qinghai-Tibet highway construction in cold regions, the impact of the destruction of ecological environment on the highway engineering is analyzed. Engineering activity changed the frozen soil environment and made the permafrost degraded and permafrost table deepened, and produced the freezing-thawing hazards, for example, frost heaving, thaw settlement, thaw slumping, and the change of the ecological environment, for example, vegetation degradation and desertification. At the same time, the destruction of the frozen soil environment made the engineering environment deteriorated, and affected the operation of Qinghai-Tibet highway. Therefore, environmental problems and environmental protection, especially, frozen soil environment should be taken enough regards.