2012年8月6日谷城倒塔事故与暴雨洪涝影响调查分析  

Investigation and analysis of the tower collapse accident and the impact of rainstorm and flood in Gucheng on 6 August 2012

作　　者：史天如 周月华[2] 叶丽梅[2] 李兰[2] SHI Tianru;ZHOU Yuehua;YE Limei;LI Lan(State Grid Hubei Electric Power Research Institute,Wuhan 430077;Wuhan Regional Climate Centre,Wuhan 430074)

机构地区：[1]国网湖北省电力公司电力科学研究院,武汉430077 [2]武汉区域气候中心,武汉430074

出　　处：《暴雨灾害》2021年第2期182-189,共8页Torrential Rain and Disasters

基　　金：湖北省电力有限公司科技项目(521532180035,SGTYHT/16-YJ-179);国家重点基础研究发展计划(2013CB430206);湖北省气象局科技基金重点项目(2020Z01)。

摘　　要：利用现场调查方法,对2012年8月6日谷城500 KV十樊一回#170倒塔事故的现场损害状况、洪水淹没范围等进行调查梳理;使用资料调查方法,对灾害发生时段的水文、气象以及发生区域内的水库、河道工况、自然地理等进行调查整理。最后,运用数理统计方法对水位、流量及降水等要素极值进行推算,并利用二维水动力模型模拟洪水路径及淹没深度和范围,对倒塔原因作进一步论证。结果表明:此次由暴雨诱发的倒塔事故呈明显的灾害链式传递特征,局地强降水诱发山洪、中小河流洪水,谷城县潭口水库入库洪峰流量和北河洪峰流量超百年一遇;洪水的巨大冲击力使行洪路径上的树木、房屋、桥梁等承灾体首先受损,受损承灾体演变为洪水路径上的卷挟物,与洪水共同转变成新的致灾因子,导致铁塔遭受上游洪水和卷挟物迎流顶冲而倒伏;模拟的170号铁塔所在的潭口水库上游的洪涝淹没区域随时间不断扩大,与现场调查确认的淹没区域基本一致。Based on the field investigation methods,the damage severity and flood inundation area at the scene of a collapse accident for the No.170 tower on the 500 kV Shiyan-Xiangfan circuit in Gucheng County on 6 August 2012 were investigated and analyzed.Then the hydrological and meteorological conditions in the disaster period as well as the reservoirs,river channels and physical geography in the disaster area were investigated and arranged using data analysis methods.We calculated the extreme values of water level,discharge,precipitation and other factors,and simulated the flood path and the depth and context of flood inundation by a two-dimensional hydrodynamic model,to assess the cause of the tower collapse event.The results show that the tower collapse event induced by rainstorm is obviously characterized by the disaster chain effects.Due to the local heavy rainfall inducing mountain torrents and the middle and small river floods,both the inflow peak discharge of Tankou reservoir and the peak discharge of the Beihe River in Gucheng exceed the record for once in 100 years.The great impact of the flood damaged the trees,houses,bridges and other disaster bearing bodies on the flood path first,and then the debris evolved from the disaster bearing bodies and the flood combine together to become a new disaster causing factor,resulting in the tower collapse due to the collision of upstream flood and debris.The simulated flood inundation area in the upstream of Tankou reservoir where the tower 170 is located increases with time,which is basically consistent with the inundation area confirmed by the field investigation.

关 键 词：倒塔事故 暴雨洪涝灾害调查 暴雨洪涝淹没模型 卷挟物 

分 类 号：P426.616[天文地球—大气科学及气象学]