CAJ | 학술논문

陡坡地形条件下山区输电线塔桩基础由于受坡度、地形地貌的影响，桩身常外露一定的高度。但塔基各桩的桩身外露高度及高差对桩基的地震反应有什么影响，尚不清楚。以地震作用下受损的西南山区某输电线塔桩基础为研究对象，采用FLAC3D数值分析软件，对桩身不同外露高度、不同高差时桩基础地震动力响应的变化情况进行分析。结果表明：随着桩身外露高度的增加，桩身峰值加速度、桩身位移、桩身内力的量值均有所增大。随着相邻桩基高差的减小，桩基础的地震反应也相应减小，进而为抗震设防区陡坡地形条件下合理的选取桩身外露高度提供一定依据。
두파지형조건하산구수전선탑장기출유우수파도、지형지모적영향，장신상외로일정적고도。단탑기각장적장신외로고도급고차대장기적지진반응유십요영향，상불청초。이지진작용하수손적서남산구모수전선탑장기출위연구대상，채용FLAC3D수치분석연건，대장신불동외로고도、불동고차시장기출지진동력향응적변화정황진행분석。결과표명：수착장신외로고도적증가，장신봉치가속도、장신위이、장신내력적량치균유소증대。수착상린장기고차적감소，장기출적지진반응야상응감소，진이위항진설방구두파지형조건하합리적선취장신외로고도제공일정의거。
Steep terrain conditions mountain area of transmission line tower pile foundation often appear a cer-tain height due to the effect of gradient and landform. How pile foundations exposed height and elevation difference will have impact on pile of transmission line in mountain area by earthquake, it is still unclear. Models about pile foundations of transmission line in southwestern mountainous area were computed and analyzed by FLAC3 D. Then seismic response on pile foundations was analyzed, which there is exposed pile height and elevation difference. The results show that:pile peak acceleration, pile displacement, internal force of pile all increased obviously along with increasing exposed pile height. Seismic response will diminished along with decreasing pile foundations elevation difference. For the seismic fortification zone under the condition of steep slope topography provide basis for reasona-ble selection of exposed height of pile.