PHC Pile-gravity Retaining Wall Composite Structure In The Application Of The Wharf Project

Wharf structure reinforcement and reconstruction is based on the old wharf in service testing, evaluation, technical measures such as strengthening and reconstruction, and to restore the damaged the original function of wharf structure and satisfy the use requirement, or to improve the bearing capacity and stability of the wharf structure existing load increase to meet the structure and function change, such as requirement. With terminal to meet the design life of the older generation, the development trend of large scale, specialization and ship quickly, port engineering in our country are about to enter mass period of wharf structure reinforcement and reconstruction. However, the current domestic research of wharf structure reinforcement and reconstruction is less, especially the design of the gravity wharf structure reinforcement and reconstruction theory and calculation method is far behind the engineering practice.This paper, by using theoretical analysis and finite element numerical simulation method for PHC pile- gravity retaining wall wharf structure reinforcing and retrofit technology to carry out a series of research work, the main research contents and conclusions are as follows:1, Analyzed the present research situation and application prospect of wharf structure reinforcement and reconstruction, find out the key problems to be solved in the present study, and through the analysis shows that the terminal is very necessary and feasible structure reinforcement and reconstruction.2, According to the PHC pile- gravity retaining wall composite structure under the limit state of force equilibrium, based on gravity structure stability calculation model of slip resistance, resistance to overturn stability of simplified calculation method; On the basis of the existing specifications stability calculation method, at the same time for pile foundation- gravity type composite structure is deduced the specification of the correction method.3, By using the finite element method for PHC pile- gravity retaining wall composite structure is analyzed, by Robot Structural finite element analysis software for the platform, the establishment of a composite structure of three dimensional elastoplastic finite element model, mainly includes the structure and the soil constitutive model selection, interface of simulation, selection of calculation domain, the definition of the boundary conditions and mesh and other key issues.4, 330 m in foshan sinotrans pier for the engineering example, according to the engineering condition and design requirements into the original gravity type structure reinforcement and reconstruction of PHC pile- gravity retaining wall composite structure, and used respectively in this paper, the stability of the calculation method and finite element numerical simulation method of the wharf structure before and after the reinforcement and the analysis and calculation. Analysis results show that the PHC pile- gravity retaining wall composite structure clear, the two kinds of structure to be able to work well together, common stress, by increasing the pile foundation can effectively reduce the displacement, stress and bottom of the pier structure sliding, significantly improve the stability and bearing capacity of the wharf structure.