Analysis Of Dynamic Response Of Overlap Tunnels Under High-speed Train Vibratory Load

With the rapid development of Chinese economy, traffic infrastructure construction and comprehensive construction of underground space, the overlapping tunnel will be more and more. Depending on the project supported by National Natural Science Foundation of China (51378168) and the project supported by the Fundamental Research Funds for Central Universities (2012HGZY0024), systematically, the thesis researches the dynamic response of the overlapping tunnel which under the action of the high-speed train load by GTS numerical methods. The main contents are as follows:(1) According to the features of trains’ vibration, we can simplify the load of the train’s vibration. Then from the geometric irregularity condition which caused by trains vibration, we can use the exciting force that accord with the irregularity management standard to stimulate vertical load of trains. Meanwhile, in the thesis, I have designed and developed the numerical calculation model of load case on the basis of tunnel-surrounding rock system vibration theory and the features of high speed railway overlapping tunnel structure.(2) From the lining structure dynamic response increment of vertical displacement, vertical acceleration and velocity, I have analyzed the influence of the overlapping tunnel dynamic response which caused by the grade of surrounding rocks, trains speed, train traffic mode, overlapping angle and the vertical distance between the tunnels, and then got the regularity of influence from the dynamic response which caused by different influences.(3) In the thesis, I have researched the relationships among the grade of surrounding rocks, trains speed and the vertical distance between the tunnels, further, and according to tunnel vault displacement, velocity and the chart of acceleration, I have summed up the time regularity that the maximum value appeared. Through the monitoring of open excavated deep foundation pit of Shuixi gate...