青藏铁路多年冻土区工程复杂性分析

ANALYSES OF THE ENGINEERING COMPLEXITIES IN PERMAFROST REGIONS WITH THE QINGHAI-TIBET RAILWAY AND HIGHWAY AS EXAMPLE

青藏铁路穿越550km多年冻土区,多年冻土地温、冻土类型以及沿线生态环境等存在较大的差异,使多年冻土区工程较为复杂。因此本文提出了冻土工程复杂性概念,建立冻土工程复杂性评价模型,并利用GIS平台对青藏铁路沿线唐古拉山越岭地段工程复杂性进行了分析和研究。研究结果表明,青藏铁路穿越的唐古拉山越岭地段工程复杂性相对较小,而青藏公路的工程复杂性相对较大。这表明了青藏公路沿线冻土工程比青藏铁路沿线更为复杂,在各种因素的影响下,青藏公路路基稳定性变化比青藏铁路更加复杂。

The Qinghai-Tibet railway has a length of 550 km crossing the permafrost area. Along the line the permafrost ground temperature, frozen ground type and the ecological environment have great differences which make engineering and construction in the permafrost area become difficlt and complicated. So, this paper proposes a frozen ground engineering complexity concept, builds the evaluate model of frozen ground engineering complexity, and uses the GIS platform to analysis and research the engineering complexity of the Tangguola Mountain Crossing along the Qinghai-Tibet railway. The result indicates that engineering complexity of the area where the Qinghai-Tibet railway crosses is smaller than where the Qinghai-Tibet highway crosses. This situation shows that the frozen ground engineering along the Qinghai-Tibet highway is more complicated than that along the railway. Under the effect of various factors, the stability problems of the Qinghai-Tibet highway are much more complicated than that of the Qinghai-Tibet railway.