Study On Displacement Law Under Periodic Load Induced By Train On The Turbulent Soil

The train-induced long-term vibration not only results in the settlement of tunnel itself, but also cause the soften soft or train-induced settlement. And the real project show the larger settlement would be made on the turbulent soil and affect the train operation. So research on displacement law which is arisen by train in a long term, especially adjacent to excavation, is meaningful.Based on the research work before, firstly, the train induced load is studied and simulated, and then the property of turbulent soil is studied. From the angle of long term micro-vibration load, the damage theory of soil, which try to explain the dynamics of turbulent soil, is adopted. The dynamic response of soft soil under different radial pressure is studied. On the base of fitting result of experiment, the prediction of settlement tendency is made. Settlement of supposed certain situation is calculated and compared to the field data, which show good agreement to reality. And it is showed that the excavation activity adjacent to tunnel will arise settlement in the aspect of theory and practice, and also it warned that if the turbulence is increase(radial pressure below 0.5), the settlement would be greatly large, which endanger the safety of metro-line.The creativity consist in the introduction of the notion of turbulent function of soil, the turbulent situation is simulated for real excavation through unloading radial pressure. The dynamic response of turbulent soil is studied through lab test. To some extent the displacement law is studied under the load of long term train induced vibration. Finally, the scheme of the further study is describe.