The Deformation Of The Foundation Pit That Affected By The Dynamic Train Load

With the rapid development of railway engineering, more and more foundation engineering need to be constructed beside the railway, controlling and predicting the deformation of the foundation engineering and surrounding buildings that caused by the dynamic train load become an important content of the railway engineering design. So the deformation of the foundation engineering and ground that caused by dynamic train load have attracted more and more experts and engineers to research. So studying on train load is becoming very important.When the excavation near the train station, because of the high density of train vehicle running, on one hand, in the process of excavation in the subway station, the dynamic train load affects the structure of existing station and the deformation of the surrounding soil; on the other hand, deformation will be caused because of the excavation during the existing station structure, Causing the deformation of the station track, and impacting the safety of the traffic.The simulation of the train dynamic load is rarely considered in the past foundation design. The train load is calculated as equivalent static load only in the road engineering. The article takes the data of the excavation during a certain station as an example, using the FLAC3D to simulate the deformation of the excavation during the train operation and making a comparison between the simulation results and the actual monitoring data. The calculation results show that according to the actual monitoring data, the ground settlement caused by the dynamic train load has been increasing as time goes by, but the rate of the growth is becoming more and more small, eventually stabilized. Because no matter there is a train or not, the reading of the anchor cable and inclinometer tube doesn‘t change, this illustrates that the dynamic train load only affects the soil in a particular range. Therefore, in order to reduce the dynamic train load on foundation pit and soil, we can reinforce the soil that only affected by the train so that using the least cost to achieve the design purpose.