施工弃土堆填保坎对山区输电线路桩基地震反应会产生何种影响，目前尚不明确。采用FLAC3D数值分析软件建立西南山区典型输电线塔位数值模型，分析桩周有无弃土堆填保坎时桩基础地震动力响应的变化情况，开展定量分析，初步探讨弃土堆填保坎对山区输电线路桩基地震反应的影响。研究表明：桩周弃土堆填保坎后斜坡场地桩基桩身水平峰值加速度、桩身位移、桩身内力、桩周土体位移差的量值均较桩周无弃土堆填保坎时增大。陡坡坡度为35°时，弃土堆填保坎增大了桩基础地震响应，降低了其在陡坡上的抗震性能。

The effect of waste landfill on seismic response of transmission tower pile foundation at mountainous slope still remains unclear. Typical models about pile foundation of transmission foundation in southwestern China mountain areas are built and analyzed using FLAC3D. Then seismic response on pile caused by waste landfill is preliminary studied under the condition where there is waste landfill around the pile or not. The results show that: compared with pile without spoil, horizontal peak acceleration, pile displacement, internal force of pile, displacement of soil around piles all increase obviously after waste landfill is built. When gradient of steep slope is larger than 35°, waste soil landfills will increase the seismic response of pile foundation, thereby seismic behavior of steep slope is reduced.