High speed railway bridge pier was exposed to environment.The reinforced concrete materials of high pier would inevitably have vertical extension-contraction deformation because of temperature change.The inf luence of high pier extension-contraction on the track geometric size was not clear.To guide the high speed rail tack maintenance,the research about track geometry change induced by high pier extension-contraction was important. Focusing on Hefei-Fuzhou high speed railway bridge,the track geometry data obtained by track precise measurement and dynamic inspection vehicle under different temperature conditions were analyzed.The results show that the rail surface absolute elevation at the high pier position changes 1 mm/℃.The track central line was basically stable,and was identical between up line and down line.The long wavel irregularity of relative longitudinal level measured by dynamic inspection vehicle showed regular changes,the change scoped is within 3 mm.%高速铁路桥梁高墩暴露于环境中,其构成材料钢筋混凝土会因温度变化而产生竖向伸缩.高墩伸缩对轨道几何尺寸的影响程度尚不明确,探讨高墩伸缩引起的轨道几何尺寸的变化程度,对指导高速铁路线路养护维修尤为重要.本文对不同气温条件下合福(合肥—福州)高速铁路巷坑大桥线路精测及动检车检测结果予以分析.结果表明:高墩处轨面绝对高程变化大约为1 mm/℃,中线基本稳定,上下行基本一致,动检长波相对高低值呈现规律性变化,变化范围在3 mm之内.
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