地震作用下多锚点桩加固土质边坡的抗震优化对比振动台试验研究

doi:10.13722/j.cnki.jrme.2020.0634

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摘要为了研究地震作用下多锚点桩加固边坡的加速度和动土压力响应的分布特征和空间变化规律，探讨多锚点桩优化抗震性能，利用大型振动台试验，通过多锚点桩边坡模型稳定性、加速度和动土压力时域特性初步分析得到沿桩身高程不同位置的区域性空间分布特征；基于上述分析运用傅里叶变化和统计学概率散点矩阵运算获得定量化表征多锚点桩加固边坡损伤水平的相关性；进而利用SPECTR计算取得多锚点桩边坡模型优化与否地震动变形破坏位移值Sd的区域性差异。结果表明：(1) 在不同地震强度作用下，边坡模型表现出区域性损伤破坏的空间耦合变形连续效应，加速度和动土压力幅值空间分布表现出桩身结构物未优化侧幅值反响突出的特点。(2) 加速度沿高程存在加速度滞后的差异主要是主震后的传播阶段造成的，桩身在同一震区发生前的各组地震动土压力和加速度响应之间的相关度极弱，前震的地震动特性亦并非各级地震动序列的简单重复叠加。(3) 用聚苯乙烯泡沫(EPS板)作为减震层、消能弹簧作为改善锚头自协调装置优化的多锚点桩对地震作用下坡体变形起到缓冲和消能的作用，其优化效果与减震层的位置相关。(4) 在低强和中强度地震作用下，锚头消能弹簧装置的可伸缩变形改善了多锚点桩身沿高程的变形协调性，可改善桩身的地震波传播特性。(5) 高强度地震作用下，桩身滑面处对地震的敏感性强，EPS发生塑性变形，增大了优化侧相对位移值，易造成多锚点桩在滑面位置发生“鼓胀”破坏或者剪切破坏，容易成为多锚点桩的抗震薄弱环节。这些结果有助于为多锚点桩的优化抗震设计提供理论依据。

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	牌立芳1
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	吴红刚2
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	马惠民5

关键词 ：边坡工程；振动台试验；土&ndash, 桩系统；地震反应；加速度响应；动土压力响应；损伤评价

Abstract：To study the distribution characteristics and spatial variations of the acceleration and dynamic soil pressure responses of slopes strengthened by multi-anchor piles under earthquake action，the optimal seismic performances of multi-anchor piles were discussed. In this paper，the regional spatial distribution characteristics along the pile elevation were obtained through the preliminary analysis of time-domain characteristics of the stability，the acceleration and the dynamic earth pressure of a multi-anchor pile slope model by large shaking table test. Then，the correlation of the damage level of the slope strengthened by multi-anchor piles was obtained by using Fourier change and statistical probability scatter matrix operation. Finally，regional differences of seismic deformation Sd were calculated by SPECTR with or without optimization of multi-anchored pile slope model. The results show that，under the action of different earthquake intensities，the slope model shows a continuous spatial deformation effect of regional damage and failure，and the spatial distributions of the acceleration and the dynamic earth pressure show an outstanding response to the unoptimized lateral amplitude of the pile structure. The acceleration lag difference along the elevation is mainly caused by the propagation stage after the main earthquake，the correlation between the seismic earth pressure and the acceleration response of each group before the pile in the same earthquake area is very weak，and the ground motion characteristic of the foreshock is not simply repeated superposition of the ground motion sequence of all levels. The shock absorbing layer with polystyrene foam(EPS plate) and multi-anchor piles with energy dissipation spring as self-coordination device of the anchor head play a buffering and energy dissipation role on the deformation of slope body under earthquake action，and the optimization effect is related to the position of the shock absorbing layer. Under the actions of low and medium strength earthquakes，the telescopic deformation of the energy-dissipating spring device of the anchor head improves the deformation coordination of the multi-anchor pile along the elevation and the seismic wave propagation characteristics of the pile. Under the action of a high-strength earthquake，the sliding surface of the pile is highly sensitive to the earthquake and EPS has plastic deformation，which increases the relative displacement value on the optimized side and is easy to cause“bulging”failure or shear failure on the sliding surface of the multi-anchor pile easily forming the seismic weak link of the multi-anchor pile. These results are helpful to provide theoretical basis for the optimal seismic design of multi-anchor piles.

Key words： slope engineering shaking table test soil-pile system seismic response acceleration response dynamic earth pressure response damage assessment

引用本文:

牌立芳1，2，吴红刚2，3，4，马惠民5. 地震作用下多锚点桩加固土质边坡的抗震优化对比振动台试验研究[J]. 岩石力学与工程学报, 2021, 40(4): 751-765.
PAI Lifang1，2，WU Honggang2，3，4，MA Huimin5. Shaking table test study on seismic optimization comparisons of multi-anchor piles for strengthening soil slopes under earthquake. , 2021, 40(4): 751-765.

链接本文:

http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2020.0634 或 http://rockmech.whrsm.ac.cn/CN/Y2021/V40/I4/751

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