输电工程带翼板新型掏挖基础水平受荷的力学分析

Mechanic Analysis on the Lateral Loads of the New-type Excavated Foundations with Wing Plates of Power Transmission Projects

采用地基反力系数法对输电工程中带翼板掏挖基础水平受荷问题进行了力学分析,利用"翼板平均应力法"修正了"翼板等中心点应力法"的计算公式,并进行了算例分析和讨论。结果表明,带翼板掏挖基础的倾覆变形减小,水平承载力增大;修正后的"翼板平均应力法"计算公式具有更广泛的适用性,而且能反映出翼板型式差异对倾覆变形计算结果的影响;宽浅式翼板基础抵抗倾覆变形要优于窄深式翼板基础,工程设计中推荐采用宽浅式的翼板型式。

The foundation resistance coefficient method is used to analyze the lateral loads of new-type excavated foundation with wing plates and the method of average stress on the wing plate is used to correct the calculation formula of the midpoint stress on the wing plate.And a case study is conducted.The results show that the new-type excavation foundation with wing plates can reduce the toppling displacement and increase the horizontal bearing capacity;and the corrected formula has wider applicability in power transmission projects and can indicate the effect of the wing plate type on the toppling deformation;the excavation foundation with wide-shallow wing plates is better than the one with narrow-deep wing plates in anti-toppling deformation,and is therefore recommended for power transmission projects.