The static test of non-embedded pile-board subgrade in deep soft soil of Shanghai-Hangzhou passenger dedicated line

The non-embedded pile-board subgrade (NEPBS) is a new type of roadbed structure widely used in constructing China's high-speed railways. The paper selects the typical section of the NEPBS project of the Shanghai-Hangzhou Passenger Dedicated Line (SHPDL). It establishes an in-situ static load test system to study and analyze the bearing mechanism and applicability of the NEPBS in deep and soft soil areas. The test results show that the NEPBS has good engineering properties; as time changes, the reinforcement internal force of the loading plate and supporting beam is shown clearly; the converted bending moment agrees with the theoretical bending moment, and the plate-soil contact stress is minor. The test results can explain and analyze the theoretical calculation results. The three-way coordination of the pile-board subgrade can effectively improve the bearing capacity of the foundation soil. The deformation of the NEPBS is reasonable. One year after the completion of the roadbed and track structure, the maximum cumulative settlement of the top surface of the loading plate is 3.29mm, which meets the settlement control requirements.