Bearing Capacity And Stability Analysis Of New Types Of Port Structure On Soft Ground

Soft clay constitutes the majority of the ground in the coastal areas of China. Boththe inverse T type breakwater with jackets&pile foundations and pile-supported platepanel jacket wharf are new type of port structures, which adapt to soft ground. Thenew structures have features of good integrity, light weight, less cost and convenientconstruction. Nevertheless, the working mechanism and failure pattern for the newstructures remain unclear, and there is no rule to follow for stability analysis. In thispaper, a series of research work have been carried out on bearing capacity andstability analysis of the new structures by using the methods of theoretical analysisand finite element numerical calculation. The main contents are as follows:The main contents about the inverse T type breakwater with jackets&pilefoundations:1. A3D elastic-plastic finite element model was estabilished for stability analysisof the inverse T type breakwater with jackets&pile foundations. Furthermore, thebearing mechanism and failure mode were made clear, and the safety factor ofstability was determined basing on the criterion of instability and P-S curve.2. Analyze the vertical and circumferential distribution of earth pressure on pilefoundations in the limit state, by which the earth resistance was calculated. Besides,the earth resistance calculated by finite element method are compared with thecalcultion mehod of ultimate earth resisitance in API.3. According to different instability modes, simplified calculation methods forstability analysis of the inverse T type breakwater with jackets&pile foundationswere presented here. In the case of soil failure, simplified calculation methods forvertical bearing capacity and anti-overturning stability were set up; In the case of pilefailure, the bearing capacity simplified calculation method was established basing onp-y curve method and criterion of “Plastic hinge”.4. Analyze stability of the inverse T type breakwater with jackets&pilefoundations in different member size, such as width of the bottom plate, diameter ofthe pile, distance between piles, and depth of the pile penetrated in soil. Consideringthe stability and strength requirement, and cost as well, the principle of determiningdimensions of the inverse T type breakwater with jackets&pile foundations wasproposed. The main contents about piled-supported plate panel jacket wharf:1. A3D elastic-plastic finite element model was estabilished for stability analysisof piled-supported plate panel jacket wharf. Furthormore, the structural limit failurestate was simulated by loading coefficient and strength reduction method, and thebearing mechanism and failure mode were analyzed.2. Analyze the magnitude and distribution earth pressure on plate panel jacket inthe limit state. Besides, the earth pressures calculated by finite element method werecompared with Rankine active, passive earth pressure.3. According to the structural characteristics, simplified calculation methods forvertical bearing capacity and anti-overturning stability were estabilished. Based onloading coefficient and strength reduction method, the safety factors were calculated,and the results were compared with the one calculated by finite element method.