Method for determining dynamic load of subway operating train and long-term settlement of tunnel

The invention provides a method for determining a dynamic load of a subway operating train and long-term settlement of a tunnel. The method comprises the steps: step 1, determining a subway operating train axle dynamic load; step 2, establishing a load-steel rail-fastener-tunnel-foundation mechanics coupling model, and determining a loading force and loading times of a single train on the soil below the train; step 3, establishing a two-dimensional finite element model, sequentially analyzing the tunnel excavation and train load loading, and determining an initial deviator force of the soil under the tunnel and a dynamic deviator force caused by the train load; step 4, determining accumulated plastic strain of the soil under the tunnel according to results of the steps; and step 5, determining accumulated settlement of the tunnel caused by the train load, and drawing a tunnel settlement curve. By adopting the method, the dynamic load of the subway operating train and the long-term settlement of the tunnel can be more accurately determined. The method is simple, convenient to popularize and suitable for analyzing and controlling the long-term settlement of soft soil shield tunnel under the effect of the train load.