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两种典型桩板墙地震响应特性的对比分析 被引量:7

Comparative analysis of seismic response characteristics of two representative sheet pile walls
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摘要 土工结构的震害调查表明,桩板墙具备优良的抗震性能,安装锚索之后效果更佳。尽管如此,目前关于桩板墙的研究大多数集中于静力方面,对于动力响应情况和抗震工作机制的研究较少,关于两类典型桩板墙,即桩板墙和锚索桩板墙的地震响应特性的对比研究未见报道。基于此,将桩板墙和锚索桩板墙进行了同台的大型振动台模型试验,对比分析了两种结构的地震响应特性。试验结果表明:两种结构的土压力、锚索拉力和桩身位移地震时程响应规律均与输入的地震动参数密切相关,如曲线形状和变化趋势,并且它们的峰值出现时刻与地震动加速度峰值出现时刻基本一致。锚索的安装,能更好地保持边坡的稳定性和有效限制桩身变形,尤其是在高地震烈度区,当土体非线性增强时,优势体现愈发明显,即预应力锚索会产生减小桩身位移的效果,特别是当地震系数为0.4时,普通桩板墙的位移达到预应力锚索桩板墙的2.4倍。此外,锚索拉力的施加,能够使桩对土体产生"主动"的反压力,两种结构在静力和地震系数为0.1的工况下桩背所受的滑坡推力基本一致,嵌固段土体抗力的差距也不明显,实测点强度的最大差异不超过20%,说明锚索的作用没有得到充分发挥;但当地震系数大于等于0.2后,锚索作用开始体现,桩土变形的协调性更好,桩背与滑体的相互作用力增大,土体抗力较桩板墙大幅度减小,更有利于边坡的稳定。同时,锚索拉力的作用使结构的悬臂段桩身内力较大,在进行结构设计时,相比于普通桩板墙,锚索桩板墙应加强悬臂段,可以适当弱化嵌固段。分析成果可供高烈度地震区桩板墙的抗震设计、灾后恢复重建及今后相关规范修订参考。 Investigations into damaged geotechnical structures after earthquakes reveal that the sheet pile wall has good seismic performance, especially reinforced by anchor cables. However, the research about sheet pile wall mostly focuses on its behavior under static conditions at present, while scarce achievements on dynamic response and seismic working mechanism yet. The comparative study of seismic response characteristics regarding two types of sheet pile wall, namely sheet pile wall and anchored sheet pile wall, has not been reported in literatures. In this paper, sheet pile wall and anchored sheet pile wall are tested in a large scale shaking table test, and dynamic characteristics of these two types of structures are analyzed. The experiment results show that the dynamic responses of time histories of earth pressures, anchor cable tensions, and displacements of pile from these two types of structures are closely relate to input seismic parameter characteristics, e.g. curve shape and variation trend. The occurrence time between peak value and peak ground acceleration is consistent. The installment of anchor cables can stabilize slope and restrict displacement of pile efficiently, especially in high seismic intensity zones where soil nonlinearity increases. Prestressed anchor cables can constrain displacement of pile. The displacement of sheet pile wall is 2.4 times of displacement of anchored sheet pile wall when the seismic coefficient reaches 0.4. The application of prestress in anchor cables can generate pseudo-active counter pressure from pile to soil, resulting in increased internal force in cantilever segment. Under the conditions of static loading and 0.1 of seismic coefficient, the landslide thrusts and soil resistance of two types are close. The maximum difference of measured intensity is less than 20 percent, indicating minor anchor cable effect. When seismic coefficient is larger than 0.2, anchor cables improves the compatibility of deformation. In this situation, the interactive force between pile and s
出处 《岩土力学》 EI CAS CSCD 北大核心 2017年第5期1335-1342,共8页 Rock and Soil Mechanics
基金 国家自然科学基金项目(No.41602332) 安全生产重大事故防治关键技术科技项目(No.2014_3189) 四川省教育厅项目(No.14ZB0056)~~
关键词 桩板墙 锚索桩板墙 振动台试验 响应特性 对比分析 sheet pile wall anchored sheet pile wall shaking table test dynamic characteristics comparative analysis
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