动态地表变形和外负荷共同作用对输电塔内力的影响

The influence on internal forces of power transmission tower under dynamic surface deformation and external load

随着电网建设的迅猛发展,越来越多的输电线路不得不途经煤矿采动区。地下煤层采出后引起的地表沉陷是一个时间和空间过程。地表的移动经历一个由开始移动到剧烈移动,最后到停止移动的全过程。开采引起了地表移动和变形破坏了高压输电塔的初始平衡状态,造成高下输电塔受力状态恶化。现有资料表明下沉是造成采动区输电塔破坏的主要原因之一。用有限元软件ANSYS对输电塔在地表变形和外负荷共同下的受力进行数值模拟,可为处于采动区输电铁塔结构的设计和安全性评估提供理论依据。

With the rapid development of power grid construction,more and more transmission lines inevitably pass through coal mining subsidence area.Surface subsidence caused by exploitation of underground coal is a process of time and space.Surface displacement goes through such a whole process that it starts to move firstly,then it is strenuous move,and finally it stops.Exploitation of underground coal brings in the displacement and deformation of surface ground,destroys the initial equilibrium state of high-voltage transmission tower,and leads to its deterioration of stress state.Available data shows that subsidence is one of the major reasons which result in the damage of power transmission towers in mining subsidence area.Numerical simulation of power transmission tower under the surface deformation and external load could be got by applying the finite element analysis software ANSYS,and it could provide a theoretical basis for structure design and safety assessment of power transmission tower in mining subsidence area.