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为保障电网的安全运行,从滑坡致灾强度和输电塔抗灾性能两方面分析了输电塔的易损性,致灾强度的核心要素是滑坡危险性及其活动强度,危险性由地质环境和降雨两大因素决定.基于改进AHP法对地质环境各指标进行权重计算,建立量化模型,求出地质环境危险性指数;根据日最大降雨量和降雨过程总降雨量,对降雨危险性进行分级;最后将两因素进行分级叠合,得到了滑坡的危险性.将致灾模式简化为致灾体对输电塔的冲击破坏,推导了滑坡冲击力计算公式,选取挠曲度来衡量输电塔的稳定程度,则输电塔易损性函数关系表示为滑坡冲击作用下输电塔的挠度与允许的最大挠度值的比值,并进行了工程实例分析.
In order to ensure the safe operation of the power grid, the vulnerability of transmission towers is analyzed from both the disaster-induced strength of landslide and the disaster-resistant performance of transmission towers. The core element of disaster-induced strength is the danger of landslide and its activity intensity. The hazard is caused by the geological environment and rainfall Two factors are determined.According to the improved AHP method, the weight of each index of geological environment is calculated and a quantitative model is established to obtain the geological environment risk index.According to the maximum daily rainfall and rainfall total rainfall, The risk of landslide can be got by grading and stacking two factors.The disaster mode is simplified as the impact damage of the disaster-hit body to the transmission tower, the calculation formula of landslide impact force is deduced, and the deflection degree is chosen to measure the stability of the transmission tower , The relationship of transmission tower vulnerability is expressed as the ratio of the deflection of transmission tower to the maximum allowable deflection under the impact of landslide impact and an engineering case analysis is carried out.