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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。
The theoretical analysis and finite element numerical simulation method are used to analyze the lateral load problem of undrained foundations in undisturbed soil, and a correction formula for calculating horizontal deformation of excavation foundation is proposed. The results show that the maximum soil resistance of the foundation calculated by the formula in Appendix G of DL / T 5219-2005 “Technical Specifications for Design of Overhead Transmission Line” is larger and the horizontal displacement at the top of the foundation is smaller. The corrected formula is used to calculate the result It is in good agreement with the numerical simulation results; when using the soil reaction coefficient method to calculate the soil resistance, it should pay attention to its scope of application.