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为避免煤矿采动损害作用下输电塔风振响应致灾,基于开采沉陷学和计算流体力学原理对输电塔-线耦合体系风致振动灾变过程进行理论分析,建立煤矿采动损害与风荷载的联合作用模型和输电塔-线耦合体系的运动方程;采用数值计算方法,分析煤矿采动损害影响下的输电塔风致振动的动力响应,探索输电塔强度衰减致灾的可能原因。研究表明:煤矿采动对输电塔的损伤及塔-线耦合体系改变了结构的动力特性,输电塔体系倒塌破坏的原因是在风湍流的激励作用下,煤矿采动对输电塔的损伤导致局部失稳区不断演化,最终产生动态受压失稳破坏。
In order to avoid the disaster caused by the wind-induced vibration of power transmission tower under the mining damage of coal mine, the wind-induced vibration catastrophe process of transmission tower-line coupling system is theoretically analyzed based on the theory of mining subsidence and CFD, and the combination of mining damage and wind load is established The dynamic model of the transmission tower and the system of the transmission line-line coupling are established. The dynamic response of wind-induced vibration of the transmission tower under the influence of mining damage is analyzed by numerical method and the possible causes for the attenuation of the transmission tower strength are explored. The results show that the damage caused by coal mining and the tower-line coupling system change the dynamic characteristics of the structure. The reason for the collapse of the transmission tower system is that under the excitation of wind turbulence, the damage caused by coal mining on the transmission tower leads to partial The area of instability continues to evolve, eventually resulting in dynamic pressure failure.