青藏铁路多年冻土区桥梁墩台变形特征及成因分析

根据对青藏铁路多年冻土区桥梁工程出现的主要变形进行的现场调查和监测数据分析,总结青藏铁路多年冻土区桥梁墩台变形病害现状及特点,揭示病害机理,对桥梁墩台变形机理、发展趋势和变化规律进行分析,提出通过改善地基多年冻土环境、减少地基土冻胀及增加桩基承载力等方式来控制桥梁墩台变形的整治措施,以保证青藏铁路的可持续安全运营。

Deformation Characteristic and Reason Analysis of Bridge Piers and Abutments on Qinghai-Tibet Railway in Permafrost Region

Based on field investigation and monitoring data analysis of the main deformations appearing at the bridges on the Qinghai-Tibet Railway in permafrost region,this paper summarized the present situation and the characteristics of the deformation disease of the bridge piers and abutments in this region,revealed the disease mechanism,and analyzed the mechanism,development trend and change rule of the bridge pier and abutment deformation. Moreover,to ensure sustainable security operation of the Qinghai-Tibet Railway,the relevant treatment measures for controlling bridge pier and abutment deformation were put forward in this paper,such as improving the permafrost environment of subsoil, decreasing the frost heave of subsoil,enhancing the bearing capacity of pile foundations,etc.