土体参数对沉桩扩张压力的影响

Impact of Soil Parameters on the Expansion Pressure in the Pile Installation

根据土塑性力学基本原理,考虑土体结构性损伤影响,考虑竖向坐标z的影响,推导出了沉桩时土体产生的挤压应力和最大扩张压力的空间解析解;分析了土体粘聚力、内摩擦角、弹性模量及泊松比等参数的变化对沉桩产生的极限扩张压力和塑性区半径分布规律的影响,发现泊松比对极限扩张压力基本没有影响,其余参数对极限扩张压力和塑性区半径都有不同程度的影响。此解答能更好地揭示了沉桩时的挤土机理,从而为施工提供更好的依据,还为应力分析相关研究提供参考。

This paper presents the analytical solutions of the maximum squeeze pressure and the maximum expansion pressure in soil during the pile installation.The solutions are derived based on the soil plasticity,the structural damage as well as the influence of the vertical direction.The impact of the soil parameters such as,soil cohesion,internal friction angle,elastic modulus and Poisson＇s ratio on the limit expansion pressure as well as radius of the plastic zone during the pile installation are investigated.The results indicated that the Poisson＇s ratio has no impact on the limit expansion pressure and the other parameters have impact.This analytical solution provides the soil movement mechanism during the pile installation and provides guidelines for the pile installation.