多年冻土区铁路路基裂缝的调查分析

通过对青藏铁路多年冻土区路基实地调查,结合工程地质条件及冻土受热条件，对裂缝的形成原因进行了分析。根据现场调查提出了裂缝的三种形式，指出危害较大的是融沉裂缝。以一处路基断面为例对裂缝深度进行了计算，计算时省略了条块之间的摩擦力，因此计算结果比实际情况稍大。

Investigation & Analysis on Cracks of Subgrade of Qinghai-Tibet Railway in Permafrost Area

Based on field investigation on the subgrade of Qinghai-Tibet Railway in permafrost area, this paper analyzes the cause of the cracks according to the engineering geological condition and the permafrost heating condition. Depending on this investigation, three forms of crack are proposed, in which the crack caused due to thawing settlement is the one having more hazards. Moreover, a subgrade section was taken as an example to calculate the depth of the crack thereon. Because the friction between the slices is ignored, the result is relatively larger than the actual value.