北斗定位技术在高速铁路沉降变形监测中的应用

Application of Beidou Positioning Technology in Settlement Monitoring of High Speed Railway

运用北斗高精度定位技术对一高速铁路的桥梁段、路基段沉降变形进行了现场监测试验,研究该技术用于高速铁路基础设施沉降变形监测的精度和可靠性。研究结果表明:高速铁路接触网高压线对北斗测量精度的影响可以忽略,受台风天气电离层的影响较大,分析长期变形监测数据时应注意对台风天气引发的异常值进行识别和处理;北斗变形监测系统的测量中误差与基线长度呈线性正相关,基线长度在3 km以内时测量中误差不超过3 mm,可满足高速铁路有砟轨道的沉降观测技术要求,在监测精度要求较为严格时,建议基线长度控制在1 km以内。

Beidou high-precision positioning technology was used to conduct on-site monitoring tests on the settlement and deformation of the bridge section and subgrade section of a high speed railway,and the accuracy and reliability of this technology for the settlement and deformation monitoring of high speed railway infrastructure were studied.The research results indicate that the high speed railway catenary high-voltage line has negligible influence on the Beidou measurement accuracy and is greatly affected by the typhoon weather ionosphere.When analyzing long-term deformation monitoring data,attention should be paid to identifying and handling abnormal values caused by typhoon weather.The measurement error of Beidou deformation monitoring system is linearly and positively correlated with the baseline length.When the baseline length is within 3 km,the measurement error does not exceed 3 mm,which can meet the technical requirements for settlement observation of ballasted tracks of high speed railways.When the monitoring accuracy is strict,it is recommended that the baseline length be controlled within 1 km.