| With the development of international trade and port handling capacity increasing,greater demands are being placed on port and coastal engineering construction capacity and speed.In contrast,shoreline in coastal city is exile.Due to the poor geological conditions in Tianjin,the high-piled wharf is the main structural wharf type,and the slope stability is crucial.Combining the project practice,this thesis carried out a series of research work about underwater vacuum preloading technique by means of theoretical analysis and numerical simulation.The main contents were summarized as follow:Firstly,underwater vacuum preloading technology in intertidal zone were analyzed,the methods of existing technology engineering were introduced,and the key issues of underwater vacuum preloading technology were pointed out.Secondly,the measured data of underwater vacuum preloading technology in intertidal zone was arranged and analyzed.The consolidation degree of soils after being treated by vacuum preloading surpassed 90%,which achieved the projected objectives,and its construction technology was tested and further improved.So the rationality of the design and the strengthening effect of underwater vacuum preloading were further validated.Lastly,the process of preloading was simulated by the ABAQUS software,and the additional hydrostatic pressure on membrane was taken into consideration.Comparing of the results of numerical simulation and field measurement data showed a good agreement of the settlement curve and the pore water pressure curve,which proved the reliability of numerical simulation.To sum up,based on the engineering practice of underwater vacuum preloading technology,the design and theoretical analysis of underwater vacuum preloading technology are carried out.And the feasible method of finite element simulation is put forward and validated.The work of this thesis has great significance to the application and popularization of underwater vacuum preloading technique. |
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