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为研究输电塔扩底桩基础在斜压荷载作用下的稳定性,采用ABAQUS有限元软件,结合塔基实际受力特点,并考虑桩土接触条件,建立了桩土体系三维实体模型,对斜压荷载作用下输电塔扩底桩稳定性进行了数值分析。结果表明,随荷载倾角的增大,桩基由于桩侧土体抗力不足逐渐表现为倾覆失稳;加大各土体强度参数对提高桩基极限承载力效果显著;软弱下卧层的存在及持力层厚度的变化仅对荷载倾角小于10°时桩基的稳定性有影响。因此,运用数值模拟分析方法探讨及预测桩土的承载能力具有易行性。
In order to study the stability of the pile foundation of power transmission tower under baroclinic loading, a three-dimensional solid model of pile-soil system is established by using ABAQUS finite element software combined with the actual force characteristics of the tower foundation and considering the contact conditions of pile and soil. Under the action of pressure load, the stability of transmission tower underpinning pile is numerically analyzed. The results show that with the increase of load dip, the pile foundation gradually shows the collapse instability due to the insufficient resistance of pile foundation soil. Increasing the strength parameters of each pile has a significant effect on increasing the ultimate bearing capacity of pile foundation. The existence of weak sublayer and The change of bearing layer thickness affects the stability of pile foundation only when the load angle is less than 10 °. Therefore, it is feasible to use numerical simulation method to study and predict the bearing capacity of pile-soil.