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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。
It is still not clear what effect the construction spoil pile will have on the seismic response of the pile foundation of the transmission line in mountainous area. The FLAC3D numerical analysis software is used to establish the numerical model of the typical transmission line tower in the southwest mountainous area. The dynamic response of the pile foundation is analyzed when there is no abandoned earth retaining and capping in the pile circumference. Quantitative analysis is carried out to investigate the effect of the Influence of Pile Foundation Seismic Response on Transmission Line in Mountain Area. The results show that the peak pile acceleration, displacement of pile body, internal force of pile body and displacement of pile body around pile are all higher than those of pile without landfill Big. When the steep slope gradient is 35 °, the spoil filling and retaining ridge increase the seismic response of pile foundation and reduce its seismic performance on steep slopes.