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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。
According to the basic principle of soil plasticity mechanics, considering the influence of soil structural damage, considering the influence of vertical coordinate z, the spatial analytical solution of squeezing stress and maximum expansion pressure of soil under pile driving is deduced. Cohesion, internal friction angle, elastic modulus and Poisson’s ratio on the ultimate expansion pressure and the plastic zone radius distribution law. It is found that the Poisson’s ratio has no effect on the ultimate expansion pressure. The other parameters The ultimate expansion pressure and plastic zone radius have different degrees of influence. This solution can better reveal the mechanism of soil compaction during pile driving so as to provide a better basis for construction and provide reference for the related research of stress analysis.