基于多年冻土条件下公路路基不稳定变形特性分析

Analysis of Unstable Deformation Characteristics of Highway Subgrade under Permafrost Conditions

为了对现有青藏公路路基变形采取更有效的养护措施以及为今后青藏高速公路的设计、施工提供参考,以青藏公路部分路基工程为研究对象,通过现场调查、理论资料研究对冻土路基不稳定变形进行了分析,探讨了冻土路基不稳定变形的主要成因及影响因素。结果表明,冻土的冻胀与融沉是冻土路基产生不稳定变形的主要成因,冻土本身的复杂性质及青藏高原气候条件是影响不稳定变形的主要因素。

To take more effective maintenance measures for Qinghai-Tibet highway subgrade deformation and provide references for the design and construction of Qinghai-Tibet expressway in the future,focusing on the part of subgrade of Qinghai-Tibet highway,this paper analyzed unstable deformation of permafrost subgrade by field investigation and theory research,then discussed the main causes and affecting factors of unstable deformation of permafrost subgrade.The results indicate that the frost heave and thawing settlement of permafrost is the main cause of unstable deformation of permafrost subgrade.The complex nature of permafrost and the climate conditions of Qinghai-Tibet Plateau are the main affecting factors of unstable deformation.