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基于原型边坡设计了大型振动台模型试验,通过监测锚索轴力、桩身土压力、坡体加速度和坡面位移时程,研究多级锚索框架梁与双排抗滑桩组合结构加固含软弱夹层岩质边坡的地震动力特性。试验结果表明:在0.15g El Centro地震波激振时锚索预应力产生损失,最大损失比为23%,建议对变形等级要求较高的边坡在锚索抗震设计时适当提高预应力初始值1.2~1.3倍;沿边坡不同高度布置的锚索其轴力响应峰值几乎同一时刻到达,而峰值增加比例呈现出空间非一致性,在锚索抗震设计时应以坡体中部抗滑桩为界将边坡分为上、下区分别考虑;坡脚抗滑桩受荷段、锚固段土压力均随着输入地震波峰值加速度的增加而增大,主动土压力分布规律将由“上小下大”转变成“上大下小”的形状,被动土压力Ⅰ、Ⅱ区的分界点将向桩体下部发展;锚索与抗滑桩在地震时表现为协同工作机制,工程设计中要充分考虑地震效应对桩锚下滑力分担比的影响。该研究成果可为更加合理地考虑地震区锚索框架梁与抗滑桩组合支护结构的设计提供指导。
Based on the prototype slope, a large-scale shaking table model test was designed. By monitoring the anchor cable axial force, the pile earth pressure, the slope acceleration and the slope displacement time history, the multi-level anchor cable frame girder and the two-row anti-slide pile composite structure reinforcement Seismic Dynamic Characteristics of Rock Slope with Weak Intercalation. The results show that when the 0.15 Centimeter El Centro seismic wave is excited, the prestressing force of the cable will be lost and the maximum loss ratio will be 23%. It is suggested that the slope with higher deformation grade is suitable to increase the initial value of prestress 1.2 ~ 1.3 times; the peak value of axial response of anchor cables arranged at different heights along the slope reaches almost at the same time, while the peak increase proportion shows spatial inconsistency. When the anchor cable is of seismic design, The slope is divided into upper and lower zones, respectively; soil pressure at anchor footing section and anchorage section increases with the increase of input peak seismic acceleration, and the distribution of active earth pressure will be changed from “Into a” big under the small "shape, the passive earth pressure Ⅰ, Ⅱ area of the demarcation point will be developed to the lower part of the pile; anchor cable and anti-slide pile in the earthquake performance for the collaborative work mechanism, engineering design Consideration of the Influence of Seismic Effects on the Slip Ratio of Pile - anchor. The results of this research can provide guidance for more reasonable consideration of the design of anchor-frame girder and anti-slide pile composite support structure in earthquake area.