OPTIMIZATION OF SUBGRADE DIFFERENTIAL SETTLEMENT DETECTION METHOD OF HIGH-SPEED RAILWAY

The subgrade differential settlement of ballastless track can bring serious effects on high-speed railway and is very difficult to handle. There are plenty of methods and means for railway detection, while many of them were established by one relationship, resulting in the, error of the testing results. On this basis, through the establishment of finite element model, the vehicle dynamic response due to subgrade settlement is calculated, the results show that, the vehicle vertical acceleration is most sensitive to the differential settlement of subgrade, it is proposed to be applied to smart train vibration analyser, and thus through the inspection of vertical acceleration on the vehicle, the rail subgrade settlement can be known, therefore, the detection method of high-speed railway subgrade settlement can be optimized.