输电线路杆塔危岩威胁等级评价方法研究  

Risk analysis of encountering rockfalls on transmission line towers

作　　者：贾宁[1] 孟庆辉[1] 贾剑[1] 

机构地区：[1]北京国电华北电力工程有限公司,北京100120

出　　处：《岩土力学》2010年第2期604-608,共5页Rock and Soil Mechanics

摘　　要：从影响滚石击中塔体时的能量以及塔体被滚石击中的可能性出发,提出现场评价危岩对塔体威胁等级的方法。该方法考虑了边坡形状、塔位与山体的相对位置、坡上危岩的数量和大小以及坡脚滚石的数量和大小等因素。当边坡总体坡度相同时,上缓下陡的折线边坡,滚石落地速度最大;而内凹的曲线边坡,滚石落地速度最小。位于山体内凹一侧的塔位,塔体受危岩威胁最大,而位于山体凸出一侧的塔位,受危岩威胁最小。Considering the slope features, location of the tower, size and quantity of potential unstable rock mass on the slope surface, and the size and quantity of the rock blocks at the slope toe, a feasible risk assessment method is put forward based on the energy of the rolling rock block reaching the tower, and the frequency of rockfalls. The velocity of the rock block rolling from a zigzag slope with a steeper segment near the slope toe is larger than that form a concaved slope. The tower located at the concaved side of a hill has more risk than the tower located at the convex side.

关 键 词：输电线路 杆塔 危岩 滚石 风险分析 

分 类 号：TU943.2[建筑科学—建筑技术科学]