高烈度地震触发山区输电线路震害发育分布规律

Research on Development and Distribution Rules of Earthquake Damage for Transmission Line Induced by High Intensity Earthquake in Mountain Area

摘要:

"5·12"汶川地震和"4·20"芦山地震均具有震级大、烈度高、破坏性强等特点,给地震灾区内的电网工程造成了极大的破坏。通过芦山地震震后对康崇线500 k V输电线路震害的现场调查结果,利用统计方法对输电线路震害的分布与地震烈度、陡坡坡度、地形地貌、杆塔基础外露比及基础嵌固比等因素的关系进行分析,得出了高烈度地震区输电线路地震灾害发育分布规律。在此基础上,根据各震害类型特点将输电线塔场地地基基础的损坏分为场地破坏和地基基础破坏,便于有针对性地对输电线路进行防震设计。

Abstract:

As the maturity of material technology increases, composite materials are gradually increasing in the application of transmission line tower engineering. According to the analysis of the earthquake disaster situation in a certain area from 2008 to 2017, statistical analysis was carried out on the damage of transmission lines caused by earthquakes. The damage distribution of transmission lines in high-intensity earthquake areas is discussed. By comprehensively considering the influence weight of three indicators (ground acceleration, slope steepness, and distance from the epicenter), the area was divided into three zoning schemes. After analysis, it was found that using the weighted comprehensive method to analyze the earthquake damage zoning of transmission lines is feasible, and the zoning scheme determined by the weighted factor of three indicators can better reflect the adverse geological conditions of the foundation of the transmission line tower. This method can also be used for the earthquake zoning assessment of transmission lines in areas where historical earthquake data is lacking, so as to provide a reference for the seismic design of transmission lines in similar areas.