潮位对桩基础沉降影响的研究

Study on the Effect of Tidal Level on Settlement of Pile Foundation

深水环境中,大型桥梁的群桩基础沉降的影响因素是复杂的,其中包括有利的和不利的。通过实测数据分析潮位对桩基础受力的影响,借助数值分析的方法对潮位引起的群桩基础沉降进行定量。采用Duncan-Chang非线性模型与Biot固结理论相结合的方法建立群桩基础有限元模型模拟潮位对群桩基础沉降的影响。研究结果表明,潮位有加速桩基土体固结的作用,潮差越大这种作用越明显,沉降也就越小,对群桩基础的受力是有利的。

In deep water, the pros and cons that influence the settlement of pile foundation are complicated. The effect of tidal level on settlement of pile foundation was analyzed by monitoring data, settlement of pile - group caused by tidal level foundation was quantitative by means of numerical analysis method. By combined Duncan - Chang nonlinear model with Biot consolidation theory, finite element model of pile - group foundation is established. The influenee of tidal level on settlement of pile - group foundation are simulated. The research result indicates that tidal level has effect on accelerating Soil Consolidation of pile founda- tion. The bigger the tidal level, more obviously the effect, the smaller settlement and the more favorable the force of pile foundation.