Study On The Design And Application Of Pile-Board Structure To Soft Soil Ground For Wu'Han-Guang'Zhou Passenger Dedicated Line

The treatment in the soft ground by using the pile-board structure is able to control the settlement effectively. and this design can reflect the principles of the advance, mature, safety, reliability, economic in the engineering practice. While, the relative researches on the interaction of the pile-board-soil, the service performance, the characteristics of force, and the design data are lack at current. In addition, the study on the dynamic responses of pile-board structure under the train load is not much, and the design method is not uniform. So these researches mentioned above have the practical significance.Based on the Wu'Han-Guang'Zhou passenger dedicated line, the planar simplified calculation method of the pile-board structure is presented, and the design load is analyzed. Simultaneously, the design theory is explored preliminaryly, and the key problems on the interaction among pile-board-soil and the non-uniform settlement are resolved by using the nodal-springs to simulate the interaction of pile-soil and using the linear springs to simulate the interaction of board-soil as well as the joist-soil. The effects of the chief parameters on the pile-board structure are analyzed, and the prediction of the internal force and deformation resulted from the weakness of the interaction among pile-board-soil caused by the long-term usage are made.The design software of the pile-board structure is programmed by using the VB language based the provided design theory, so the reinforcements of the pile and joist and board are attained simply. A three-dimension dynamic model is established, and the numerical analysis of the designed pile-board structure is conduced. Meanwhile, the dynamic responses of pile-board structure under the train load are analyzed, as well as the relation between the response and velocity of the train.The in-situ test of pile-board structure is conduced and the results of the properties of the internal force and deformation are attained. The reasonability of the calculation model and the safety of the design are verified.From the analysis above , the theory to calculate. methord to design, dynamic characteristics and operational performance of pile-board structure are analyzed and discussed, which can offer reference for scientific research and design in the future.