Abstract：Abstract：Research purposes：To guarantee safety operation of high speed railway (HSR) in cold regions, based on the stability difference analysis, the monitoring indexes were determined. A series of corresponding monitoring technologies were carried out, the long-term monitoring system was established on Harbin-Dalian (HD) HSR roadbed to realize integrated automatic acquisition, automatic signal transmission, automatic data analysis and processing of stability indexes. The three years monitoring data were analyzed preliminarily to reveal the roadbed stability indexes rules.
Research conclusions：(1) The roadbed temperatures fluctuate periodically. The temperature amplitudes decrease with depth. The seasonal active layer experiences one-way freezing from the roadbed surface and two way thawing. (2) Water at various depth is observed to be migrated and redistributed. (3) Under the train cyclic load and freeze-thaw cycles, roadbed filling prosperities may be changed and thus give rise to the frost heave, thaw subsidence and compressive deformation. (4) The stability monitoring system work well. Monitoring data can provide support for the disease repairing and traffic safety guarantee of HDHSR roadbed.
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