煤矿采动损害影响下输电塔-线耦合体系风致振动灾变分析

Analysis of coal mining damaged coupling system of transmission tower and line catastrophe caused by wind-induced vibration

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。

Aiming at preventing coal mining damaged transmission tower structure catastrophe caused by wind-induced vibration,a theoritical analysis of process of wind-induced vibration Equations of motion of transmission tower-line coupling system were established. wind-induced vibration of transmission tower under influence of coal mining damag catastrophe was made. Vibration response of e was analyzed in order to get possible causes of strength loss of transmission tower. The results show that dynamic characteristics of transmission tower-line coupling system are changed due to coal mining and tower-line coupling system, and that local instable region in the transmission tower evolve under influence of both coal mining and wind collapse of transmission towers.