【摘要】 路基面冻胀量是影响寒区高铁路基在冬季安全运营的关键性指标之一,也是协调轨面变形和判断扣件系统安全储备量的直观因素之一。根据哈大高铁沈阳至哈尔滨段开通运营后的前两个冻融期路肩冻胀量数据及其评估结果,认为现有的冻胀观测结果评估和预测方法对路基面整体冻胀量估计不足,在长期变形预测中并未考虑到一旦地基和基床固结完成时产生的冻胀量对路基和轨面变形的影响。结合哈大线实测路基面冻胀量数据,探讨了观测结果的合理性及应用的方法。分析表明:现在所测得的路肩处路基面的冻胀量只是名义冻胀量,较实际冻胀量要小,简单应用此数据从长远来看偏于危险;考虑到路基面上不同构件在环境条件下的组合效应,单独使用路肩处冻胀量来评估整体路基变形特征存在不足。因此在预测和评估长期路基面冻胀变形时,需结合观测数据和实际工况进行全面合理的分析,以提高路基工后变形和季节性变形预测的可靠度。更多还原

【Abstract】 The frost heaving of subgrade is an important index to evaluate the safety of high-speed railway in cold regions,which also influence the rail surface deformation coordination and the fastening system’s safety. Considering the monitoring results of frost heaving on the shoulder of Harbin-Dalian Railway Passenger Dedicated Line in the first two freezing-thawing cycles after operation,it is found that the current evaluating and predicting system has a shortcoming in estimating the frost heaving values. The system does not consider the influence of subgrade settlement to the frost heaving estimation. In this paper,the frost heaving characteristics in subgrade are discussed and a method based on the observation results is put forwards. The results show that the monitored value of frost heaving is lower than the actual value; therefore it is dangerous to apply such a system to evaluate the long-term frost heaving. At the same time,frost heaving of the shoulder does not represent the deformation of the subgrade. For long-term prediction and evaluation of the frost heaving of a high-speed railway subgrade,it is necessary to analyze the monitored data under the actual engineering conditions,so that to improve the reliability of predicting seasonal deformation.更多还原