地处三个构造带间三角地带的茂县—银杏220 kV输电线路是四川电力网络中重要的输电工程,崩塌、滑坡、泥石流等等灾害,严重影响输电线路的安全和正常运行.为探究其与研究区内的崩塌、滑坡之间的关系,在线路沿线地质灾害详细调查的基础上,选取工程地质岩组、坡度、坡向、断裂构造、区域交通建设共5个影响因子,进行地质灾害成因与分布特征研究.结果表明:变质岩类半坚硬岩岩组、岩浆岩类坚硬侵入岩岩组中灾害数量最多,达灾害总数的71.6%;20°~60°的坡度范围内灾害数量占总数的78.7%,滑坡仅分布于40°以下的斜坡中,而崩塌多分布于30°以上的斜坡;E、W向斜坡较其他方向更容易发生灾害;断层对崩滑灾害的显著控制范围约800 m;区域交通建设的影响范围在400 m.研究成果对复杂山区输电线路的规划设计及防灾减灾具有重要参考价值.%Maoxian—Yinxin 220 kV transmission line is located in three tectonic zone between the triangle area which is an important transmission project of Sichuan electric power network .Many disasters ,such as rockfall ,landslide and de-bris flow disasters etc .seriously affect the safety and normal operation of transmission line .On the basis of detailed in-vestigation of geological disasters along the line ,five influencing factors have been selected which are engineering geolo-gy ,rock formation ,slope ,slope direction ,fracture structure and regional traffic construction ,the relationship between landslide and landslide in the study area was analyzed .The results show that :there are the largest number of disasters in metamorphic rock ,semi hard rock group and magmatic intrusive rock group which account for 71 .6% of the total number of disasters ;In the slope range of 20~60 degrees ,the number of disasters account for 78 .7% of the total ,and the land-slide was only distributed in slopes below 40 degrees ,while landslides were mostly distributed over slopes above 30 de-grees;Slopes in the E and W directions are more prone to disasters than others ;The obvious control range of fault to avalanche and landslide is about 800 m;The influence scope of regional traffic construction is 400 m .The research re-sults are of important reference value to the planning ,design and of transmission lines in complex mountainous areas and to disaster prevention and mitigation .
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