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The top-mounted dividable pile-board structure subgrade is a new type of high speed railway line structure crossing weak foundation.The train loading can lead to greater alternating stress in this structure through the track structure,so it is necessary to technically research the last-term performance of pile-board structure using the true-to-scale in situ tests.The forced vibration loading is repeated 1 million times in different cross-sections of pile-board structure for high-speed railway using the in situ dynamic testing system DTS-1,to simulate the fatigue characteristics of the pile-board structure under long-term dynamic load.