青藏高原多年冻土地区涵洞基础稳定性调查及分析

nvestigation and Analysis on Stability of Culvert Foundation in Permafrost Region of Qinghai-Tibet Plateau

本文通过对于国道G109线(青藏公路)路段的公路工程概况和该地区的自然地质条件的调查结果的分析,以及青藏公路涵洞使用状况调查方法与调查结果的探讨,在此基础上论述了多年冻土区涵洞破损类型与特征,并对其发生的深层次原因进行了较为详尽的总结,提出针对多年冻土地区涵洞破坏原因,应从4个方面入手,采取措施进行病害防治:减小工程对多年冻土的热扰动;消除或削弱季节活动层的冻胀和融沉;增强涵洞结构抵抗和适应冻融变形的能力;消除或减小涵底渗流。

Based on the analysis investigation results of natural geological conditions in this area and national highway (Qinghai-Tibet highway) on G109, as well as the discussion of investigation methods and results of culvert usage in Qinghai-Tibet Highway, the types and characteristics of culvert damage in permafrost region are discussed, and deeply summaries in detail for the causes, reducing the thermal disturbance of the project to permafrost;eliminating or weakening the frost heave and thaw settlement of seasonal active layer;enhancing the resistance of culvert structure to freeze-thaw deformation and adapting to freeze-thaw deformation;and eliminating or reducing the seepage at culvert bottom.