Bending deformation of pile group in the slope with intercalated weak layer under seismic excitations
YAN Kongming1，LIU Feicheng1，ZHANG Jianjing1，LIU Yang1，WANG Zhijia2
(1. School of Civil Engineering，Southwest Jiaotong University，Sichuan，Chengdu 610031，China；
2. College of Civil Engineering and Architecture，Hainan University，Haikou，Hainan 570228，China)
Abstract：The centrifugal shaking table test with the centrifugal acceleration of 50 g was carried out to investigate the bending moments and deformation modes of the pile group installed slope with intercalated weak layer and to investigate the effect of the inner deformation of slope and the inertia force of superstructure on the pile group foundation. The results showed that the bending deformation of the pile group foundation was controlled by the inertia force of the superstructure under the seismic excitations，and the range is limited around the pile top and take up 26%–28% of overall length of the piles. The modes of bending deformation of the pile group foundation were classified as the uniform type and the non-uniform type，the types with and without the inflection point，the parallel and non-parallel types. The effect of intercalated weak layer on the amplification coefficients of acceleration within the slope is related to the peak values of input accelerations and the amplification coefficients of the weak intercalated layer increased nonlinearly with the increasing of the peak values of input acceleration. Besides，there are obvious differences in the dynamic responses of superstructure and ground surface of the slope，and the differences were increased nonlinearly with the increasing of the peak seismic acceleration and were multiple increased when the input acceleration peak is equal or greater than 0.25 g.
闫孔明1，刘飞成1，张建经1，刘 阳1，王志佳2. 地震作用下含倾斜软弱夹层边坡内群桩的弯曲变形研究[J]. 岩石力学与工程学报, 2017, 36(8): 1966-1976.
YAN Kongming1，LIU Feicheng1，ZHANG Jianjing1，LIU Yang1，WANG Zhijia2. Bending deformation of pile group in the slope with intercalated weak layer under seismic excitations. , 2017, 36(8): 1966-1976.
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2017, Vol. 36 
