In-Situ Test And Numerical Analysis Of Embedded Continuous Pile-Board Structure In Shanghai-Hangzhou Passenger Dedicated Line

Pile-board structure has been used frequently in special sections of high-speed railway and achieved remarkable results. But for the first time it was applied for the cross-subway subgrade. Therefore, it has practical significance to study the interaction between the dynamic and static characteristics of pile-board structure as the cross-subway subgrade and the dynamic mechanics of subway.Based on the fact that pile-board structure was applied in the metro-across segment in Shanghai-Hangzhou Passenger Dedicated Line, this article has a full investigation about the application of the pile-board structure at home and abroad and introduces its design method. The internal stress, contact stress and deformation characteristics of the various components of the pile-board structure were gotten from field static test of practical sites.Compare the field test results with theoretical calculation results, the two are basically consistent and the test values are less than theoretical values which verify the reasonableness and safety of the design.Running a field road test on the pile-board structure and measuring the dynamic response of each measuring point when the train went through the test section, this article explores the influence of train speed or train type on dynamic response, the affections on left lane when a train traveling on the right lane and the interaction between the subway dynamic mechanics and high-speed railway dynamic characteristics. Three-dimensional dynamic numerical simulation model was established and this article studied the dynamic response distribution law of the pile board structure, the influence of train speed on the dynamic response of the pile-board structure and the affection of subway traffic on the pile-board structure. Compare and analysis the calculated values with the experimental values and validate the reasonableness of the calculation model.The settlement value after construction of the subgrade test section which applied the pile-board structure is1.86mm till operation. It shows that pile-board structure can effectively control the subgrade settlement after construction. The results of road test and numerical simulation indicate that the interaction between high-speed railway dynamic characteristics and subway dynamic mechanics is so small that it does not affect the safety of structure. All of the above explains that the pile-board structure can be applied as subgrade in the cross-metro section.