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| Dynamic response and p-y curve of symmetric inclined piles in liquefied soil |
| LI Yurun1，2，ZHANG Yulei1，CHEN Zhangsheng1，ZHANG Yubin1 |
| (1. College of Civil Engineering and Transportation，Hebei University of Technology，Tianjin 300401，China；2. Civil Engineering Technology Research Center of Hebei Province，Hebei University of Technology，Tianjin 300401，China) |
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Abstract The dynamic response of pile foundation in liquefied soil under earthquake has always been a hot issue in the geotechnical engineering. This paper presents the results of the electromagnetic shaking table test on the symmetric double vertical piles and the symmetric double inclined piles in non-liquefied soil and saturated sand. The sinusoidal waves of different earthquake intensities and the El-Centro seismic wave were applied in the tests. The comparsion between the results for two types of piles was made. Under either the sinusoidal wave or the El-Centro seismic wave，when the peakacceleration increases，the acceleration at pile cap and the amplified displacement of inclined piles are lower than those of vertical piles under the same working conditions. The inclined piles resist thehorizontal earthquakebetter than vertical pile especially whensandis liquified. The inclined piles and vertical piles have the smaller bending moments in the non-liquefied sand. But when the saturatedsand is liquefied，the maximum bending moment of the inclinedpiles is located on the pile cap and at the place of 0.16 m away from the pile tipand is about three times as much as that of the vertical pile，which is mostlylocated at the connection of the pile and the pile cap. The enclosedarea of hysteretic p-y curves of inclined piles is larger，which is better for thedissipation of energy. Theoverall slope ofhysteretic p-y curves of inclinedpiles is lower in non-liquefied sandbut higher in saturated sandthan ones of vertical piles. Therefore，the overall performance of inclinedpiles is better than vertical piles，but the local flexural rigidity of inclinedpiles should be increased to resist the larger bending moment.
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2018, Vol. 37 
