Subgrade settlement recognition of high-speed railway based on multi-source detection data fusion
Due to the influence of environmental changes,groundwater exploitation and other factors,the subgrade of high-speed railway may have a large settlement phenomenon,among which the uneven settlement has a great impact on the safety,comfort and durability of high-speed railway operation.Therefore,it is very important to diagnose the subgrade settlement area of high-speed railway quickly and effectively.Based on multi-source data such as comprehensive inspection track dynamic detection data,vehicle shaker detection data,and ledger information,this paper studied the wavelength and amplitude characteristics of track irregularities in the uneven settlement area,and established the correlation relationship among track irregularities characteristics,train running speed and train acceleration.On this basis,extract the indexes that can reflect the characteristics of uneven subgrade settlement,such as wavelength factor,amplitude factor,vehicle body dynamic response factor,vertical curve factor and deterioration rate factor.The multi-source heterogeneous data fusion method was used to unify the value of each indicator and determine the fusion weight of each indicator.Finally,the comprehensive evaluation index and corresponding calculation formula of high-speed railway subgrade settlement were established.The results show that the uneven settlement of subgrade will cause a track irregularity with long wavelength and large amplitude,and then lead to the acceleration of vehicle body exceeds limit value which could be detected with vehicle shaker.The settlement can be reflected indirectly when the long wave irregularity of track in the same section tends to deteriorate,while the vertical curve as a pre-designed slope has some interference to the diagnosis of subgrade settlement.The comprehensive evaluation index of subgrade settlement can adopt the percentage system.According to the field practical experience,more than 60 points should be taken as the evaluation standard of settlement occurrence.The practical verification of three high-speed railways shows that this method can effectively discover subgrade settlement area and timely guide the accurate maintenance for track maintenance department.
subgrade settlementmulti-source data fusiondynamic detectionvehicle shaking instrument
万方数据
维普
