高压输电线路输电塔采动区地表变形作用下附加内力研究

Study on additional internal stresses of HV power transmission tower caused by ground deformation in mining subsidence area

为了揭示采动区地表变形对输电塔附加内力的影响,根据地下开采引起的地表变形规律,采用有限元模型模拟,分析了地表单向拉伸变形、单向压缩变形、双向拉伸变形、双向压缩变形作用下,输电塔附加内力的变化规律。得出了在地表变形作用下,输电塔底部主材受力最为不利、下部主材次之、支架处主材受力最小的结论。

In order to reveal the influence of the ground deformation on the additional internal stresses of the power transmission tower in mining subsidence area,according to the law of ground deformation caused by underground mining,using the finite element model simulation,the variation laws of the additional internal forces of power transmission tower under acting of the ground unidirectional tensile deformation,the unidirectional compressive deformation,the bidirectional tensile deformation and the bidirectional compressive deformation were analyzed. The conclusion is that under the acting of the ground deformation,the stress of the main material in the foundation of the power transmission tower is maximum,the stress of the main material in the lower part of the power transmission tower is medium,and the additional internal forces of the main material in the top is minimum.