基于层次分析法的城市轨道交通雷击风险评估研究

Research on lightning risk assessment of urban rail transit based on analytic hierarchy process

为研究城市轨道交通的雷击风险,选取武汉市轨道交通4号线二期工程为样本,采用层次分析法,对该条线路雷击风险进行评估,结果表明:由于城市轨道交通线路长、跨越区域广的特点,各站雷击大地密度年分布及密度分布具有不均匀性;不论是地上站还是地下站,雷击大地密度和雷电流强度均是影响评价结果的2个重要因素;地上站的防护核心是直击雷防护,地下站的防护核心为雷击接触电压和跨步电压防护;地上站的雷击风险为一般风险级别,地下站为较低风险级别。

In order to study the lightning risk of urban rail transit,this paper selects the second phase of Wuhan rail transit line 4 as a sample and uses the analytic hierarchy process to evaluate the line.The results show that the urban rail transit has long lines and spans an area that is widely characterized by an uneven distribution of ground flash density distribution at each site.Whether it is above-ground or underground,ground fl ash density and lightning current intensity are two important factors affecting the evaluation results.The core of the protection of ground stations is direct lightning protection,the main core of the protection of underground stations is the lightning contact voltage and the step voltage protection;the lightning risk of aboveground stations has a general risk level,and underground stations have a lower risk level.