严寒地区高速铁路路基稳定性长期监测研究

Long-term Monitoring of High-speed Railway Roadbed Stability in Cold Regions

研究目的:为保证严寒地区高速铁路的安全运营,通过分析严寒地区高速铁路路基的特点确定监测指标,并结合哈大高铁路基开展相应的监测技术研究,建立路基稳定性长期监测系统,实现路基状态多参量一体化的自动采集、信号自动传输、数据自动分析处理。基于获取的三年监测数据,进行路基稳定性指标的初步分析。研究结论:(1)路基地温呈周期性波动,地温振幅随深度增加而减少。浅层存在季节冻结层,冷季时自地表向下单向冻结,暖季来临时双向融化;(2)不同深度处的水分出现了迁移和重分布;(3)在列车动荷载和冻融循环作用下,填土性质可能发生了变化,导致了冻胀和融沉压缩变形;(4)监测系统运行稳定,监测数据可充分反映路基的地温等指标的分布规律,从而为哈大高铁路基的病害整治和行车安全提供重要支撑。

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.