Experimental study on seismic reinforcement of bridge foundation on silty clay landslide with inclined interlayer

IF 2.6 2区 工程技术 Q2 ENGINEERING, CIVIL Earthquake Engineering and Engineering Vibration Pub Date : 2024-01-24 DOI:10.1007/s11803-024-2233-0
Da Lei, Hanmo Xiao, Jianhua Ran, Bin Luo, Guanlu Jiang, Tianlang Xue
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Abstract

A shaking table test for a bridge foundation reinforced by anti-slide piles on a silty clay landslide model with an inclined interlayer was performed. The deformation characteristics of the bridge foundation piles and anti-slide piles were analyzed in different loading conditions. The dynamic response law of a silty clay landslide with an inclined interlayer was summarized. The spacing between the rear anti-slide piles and bridge foundation should be reasonably controlled according to the seismic fortification requirements, to avoid the two peaks in the forced deformation of the bridge foundation piles. The “blocking effect” of the bridge foundation piles reduced the deformation of the forward anti-slide piles. The stress-strain response of silty clay was intensified as the vibration wave field appeared on the slope. Since the vibration intensified, the thrust distribution of the landslide underwent a process of shifting from triangle to inverted trapezoid, the difference in the acceleration response between the bearing platform and silty clay landslide tended to decrease, and the spectrum amplitude near the natural vibration frequency increased. The rear anti-slide piles were able to slow down the shear deformation of the soil in front of the piles and avoid excessive acceleration response of the bridge foundation piles.

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倾斜夹层淤泥质粘土滑坡桥梁地基抗震加固试验研究
在带有倾斜夹层的淤泥质粘土滑坡模型上,对用抗滑桩加固的桥梁基础进行了振动台试验。分析了桥梁基础桩和抗滑桩在不同荷载条件下的变形特征。总结了带倾斜夹层的淤泥质粘土滑坡的动力响应规律。根据抗震设防要求,合理控制后抗滑桩与桥梁基础的间距,避免桥梁基础桩的受力变形出现两个峰值。桥基桩的 "阻挡效应 "减小了前抗滑桩的变形。淤泥质粘土的应力应变响应随着斜坡上出现的振动波场而加剧。由于振动加剧,滑坡的推力分布经历了从三角形到倒梯形的转变过程,承台与淤泥质粘土滑坡的加速度响应差异趋于减小,自然振动频率附近的频谱振幅增大。后抗滑桩能够减缓桩前土体的剪切变形,避免桥梁基桩产生过大的加速度响应。
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来源期刊
CiteScore
4.70
自引率
21.40%
发文量
1057
审稿时长
9 months
期刊介绍: Earthquake Engineering and Engineering Vibration is an international journal sponsored by the Institute of Engineering Mechanics (IEM), China Earthquake Administration in cooperation with the Multidisciplinary Center for Earthquake Engineering Research (MCEER), and State University of New York at Buffalo. It promotes scientific exchange between Chinese and foreign scientists and engineers, to improve the theory and practice of earthquake hazards mitigation, preparedness, and recovery. The journal focuses on earthquake engineering in all aspects, including seismology, tsunamis, ground motion characteristics, soil and foundation dynamics, wave propagation, probabilistic and deterministic methods of dynamic analysis, behavior of structures, and methods for earthquake resistant design and retrofit of structures that are germane to practicing engineers. It includes seismic code requirements, as well as supplemental energy dissipation, base isolation, and structural control.
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