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为了解上覆软土层的输电塔双层地基中上拔力和水平力共同作用下桩基的受力情况,采用ABAQUS有限元方法对斜拉荷载作用下扩底桩—双层土体地基体系进行数值模拟,通过改变上覆软土层厚度和强度等进一步分析铁塔地基的破坏性状。结果表明,软土层越厚,桩基承载力越低,且荷载倾角在荷载临界角两侧时对桩基承载力下降幅度影响不同;随着软土层强度的增加,桩基承载力提高;双层地基土体的破裂面亦随着软土性质的改变而发生变化。
In order to understand the mechanical behavior of pile foundations in the double-layer foundation of power transmission tower with overlying soft soil, ABAQUS finite element method System by numerical simulation, by changing the thickness and strength of overlying soft soil layer further analysis of the destruction of the tower foundation. The results show that the thicker the soft soil layer, the lower the bearing capacity of the pile, and the influence of the load inclination on both sides of the critical angle of load is different. The bearing capacity of the pile foundation increases with the increase of the strength of the soft soil layer The rupture surface of double-layer soil also changes with the change of soft soil properties.