【摘要】 钢板桩围堰适用于深水、滩涂等复杂地质，对钢板桩围堰打桩及工作过程进行了稳定性分析。采用Fluent软件对不同工况下打桩过程进行流体动力学研究并计算其动载荷。并对钢板桩稳定性进行了校核。提出流体动力学和固体力学相结合的打桩过程稳定性分析方法。采用ANSYS屈曲分析外压载荷作用下围堰整体结构的稳定性。结果表明：动载荷受幂律指数、稠度系数及静载荷的综合影响，稠度系数与流体黏度呈线性关系，幂律指数体现了流体的非牛顿性，而不同载荷作用下流体黏度也会发生变化，需结合屈曲分析结果、打桩时间等综合选择适宜打桩力。采用特征值屈曲分析和非线性屈曲分析得到的围堰临界失稳应力较为接近，非线性屈曲分析考虑了材料的非线性，包含塑性变形成分，因此临界失稳应力更大。更多还原

【Abstract】 Steel sheet pile cofferdam are suitable for deep water, mud flat and other complex geological. The stability of steel sheet pile cofferdam during the piling process and working process was studied in this work. The fluid dynamics of the piling process in a mud with different condition was studied through Fluent software and was calculated the dynamic load. The stability of steel sheet pile was evaluated. A method of combining fluid dynamics analysis and solid mechanics analysis to study the stability of piling process was proposed. The stability of cofferdam under external pressure was analyzed by ANSYS software. The results show that dynamic load of non-Newtonian fluid is influenced by the power law index, consistency coefficient and static load, the consistency coefficient is linearly related to the fluid viscosity, the power law index reflects the non-Newtonian nature of the fluid, and different loads will cause the change in fluid viscosity on the other hand. Thus, it is needs to consider the buckling analysis result, the piling time and the piling equipment together to select the appropriate piling force. The critical buckling stress of the cofferdam obtained by the eigenvalue buckling analysis and the non-linear buckling analysis present the closer result. The non-linear buckling analysis takes the non-linearity of the material into account and includes the plastic deformation component, so the critical instability stress is greater.更多还原