输电线路掏挖基础侧向受荷分析与数值模拟

摘要：采用理论分析和有限元数值模拟的方法，对原状土中的掏挖基础侧向受荷问题进行了分析，提出了计算掏挖基础水平变形的修正公式。结果表明，由DL/T 5219—2005《架空送电线路基础设计技术规定》附录G中的计算公式计算得到的基底最大土抗力偏大、基础顶部水平位移偏小；采用修正后的公式计算结果则较好地吻合数值模拟结果；采用地基反力系数法计算土体抗力时，应注意其适用范围。

Mechanics Analysis and Numerical Simulation for Excavated Foundation Loaded Laterally in Power Transmission Line

By mechanics analysis and finite element method,the paper analyzes the excavated foundation loaded laterally in undisturbed soil,and puts forward a corrected formula for foundation horizontal deformation calculation.The results show that the maximum soil resistance stress value in the foundation bottom given by the formulas of the regulation in Appendix G of ＂Technical regulation for designing foundation of overhead transmission line（DL/T 5219—2005） ＂ is too high,while the horizontal displacement value at the foundation top is too low.The results worked out by the revised formulas are well consistent with numerical simulation results.Attention should be paid to the applicable scope when adopting the foundation resistance coefficient method.