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以哈大高速铁路路基冻胀监测数据为基础,分析了严寒地区高速铁路无砟轨道路基冻胀特点,提出了冻胀波形特征及表征方式。建立了路基冻胀变形与CRTSⅠ型板式无砟轨道不平顺传递计算模型,计算分析了路基冻胀对轨道不平顺及无砟轨道结构的影响规律。分析结果表明:路基冻胀上拱变形在波长20m以内时,传递到无砟轨道轨面的不平顺波长增大、峰值接近,可以采用轨道不平顺管理标准作为路基冻胀的控制标准;在波长40m以内时,对底座板和轨道板的离缝及受力影响显著,能够根据离缝控制标准和轨道板与底座板产生裂缝特性确定对应冻胀波长和峰值的管理值。从而将轨道不平顺和无砟轨道结构伤损控制所对应的冻胀波长与峰值结合起来,并考虑扣件与坡度调整等维修方式,提出严寒地区高速铁路无砟轨道路基冻胀管理标准的确定方法。
Based on the monitoring data of the subgrade frost heaving of the Harbin-Dalian high-speed railway, the frost heaving characteristics of the ballastless subgrade of the high-speed railway in severe cold area are analyzed, and the characteristics of the frost heave waveform and the characterization methods are proposed. The calculation model of subgrade frost heave deformation and CRTS Ⅰ slab ballastless track is set up. The influence of subgrade frost heave on the track irregularity and ballastless track structure is calculated and analyzed. The analysis results show that when the deformation of the subgrade frost heaving arch is within 20m wavelength, the irregular wavelength transmitted to the ballastless orbit rail surface increases and the peak value approaches, and the track irregularity management standard can be used as the control standard for subgrade frost heave. Within 40m, the influence of the separation and stress on the base plate and the rail plate is significant, and the management value corresponding to the frost heave wavelength and the peak value can be determined according to the control standard of the air separation and the crack characteristics of the rail plate and the base plate. So the frost heaving wavelength corresponding to the structural damage control of the track irregularity and the ballastless track is combined with the peak value, and the maintenance methods such as the fastener and the slope adjustment are taken into consideration, and the standard of the subgrade frost heaving management for the high-speed railway in the cold area is proposed method.