海床失稳对桩体土压力的影响*

传统的海洋桩基的设计计算方法未考虑海床失稳的影响,计算结果的精确性和可靠性无法保证,这将为设计出的海洋建筑物留下安全隐患。因此,在海洋桩基设计分析中有必要考虑海床失稳的影响。首先介绍了基于Biot固结理论和虚拟桩技术所建立的考虑海床失稳影响的桩-土相互作用模型,基于该模型求得的土压力可以考虑海洋环境条件、海床土体条件及桩体几何、物理条件等多因素的影响。而后,基于土压力的数值解,探讨了桩体挠度、波高、水深及土体压缩模量等对桩体土压力的影响,得出了若干结论,可为海洋桩基设计提供参考。

Effect of seabed instability on pile' s soil pressure

The traditional ocean pile design and calculation methods do not take the seabed instability into account, therefore, the accuracy and reliability of results can not be guaranteed, which will induce that the ocean buildings are not safe enough. So, the seabed instability shall be considered in the pile design and analysis. This paper firstly introduces the mathematical model of the pile-soil interaction considering the seabed instability based on Biot consolidation theory and fictitious pile technique, the soil pressure obtained through which can consider such conditions as ocean environment, seabed soil and pile etc. And then, based on the numerical solutions, this paper discusses the effects of pile top deflection, wave height, water depth and soil modulus on soil pressure, and some conclusions are obtained, which can be referenced in the design of ocean pile.