Dynamic response of CFG and cement-soil pile composite foundation in the operation stage

Abstract

More and more attention is paid to the stability, safety and comfort of trains during its operation stage. When the train is running, in addition to the track gravity, it is also affected by the train load and earthquake, these dynamic effects will have a certain impact on the normal operation of the railway. However, the current research on the dynamic response of composite CFG and cement-soil compaction piles foundations under dynamic loads is rarely involved. Taking the composite foundation of Baoji-Lanzhou Passenger Dedicated Line as the research object, the dynamic response of the composite foundation under train load, seismic wave and train-seismic load is analyzed in detail by using numerical simulation software. The results show that under the train load, the maximum displacement occurs at the action position of the train load, and it is gradually reduced downward. The overall displacement is not large, and the influence on the operation of the train is little. Under earthquake action, the displacement is the largest at the bottom of subgrade, and gradually decreases upward, which has little effect on the top of embankment. Under the train-earthquake action, the displacement of subgrade bottom and embankment top is larger, and gradually decreases to the middle. It provides the corresponding theoretical basis for the same type of railway subgrade engineering.