组合支护结构加固高边坡的地震动响应特性研究

发布时间：2018-02-08 15:13

本文关键词： 边坡工程锚索协同工作抗滑桩振动台试验边际谱　出处：《岩石力学与工程学报》2017年04期 　论文类型：期刊论文

【摘要】：基于原型边坡设计大型振动台模型试验,通过监测不同幅值和类型地震波作用时的桩身土压力、坡体加速度、格构梁位移和锚索预应力,研究组合结构与加固边坡体的动力响应特性,评价加固效果。试验结果表明:锚索与抗滑桩在地震时协同工作,桩身土压力随输入波幅值增加而增大,锚索预应力变化规律与边坡体的稳定程度有关,表现为先减小后增大;地震造成抗滑桩主动土压力的合力作用点上移至l/2处,被动土压力区的2个转点也发生明显变化;输入地震波峰值不大于0.5 g时,格构梁位移响应值较小,坡体中部抗滑桩以下不存在加速度放大效应,边坡整体稳定性好。另外,运用加速度时程的Hilbert边际谱研究了坡体内部的震害损伤特性,损伤识别结果与试验监测数据吻合。该研究成果可为更加合理地考虑地震区锚索格构梁抗滑桩联合防护边坡的设计提供指导。
[Abstract]:Based on the model test of large shaking table designed by prototype slope, the soil pressure of pile, the acceleration of slope, the displacement of lattice beam and the prestress of anchor cable are monitored under the action of different amplitude and type of seismic wave. The dynamic response characteristics of composite structure and reinforced slope are studied and the reinforcement effect is evaluated. The experimental results show that the earth pressure of pile body increases with the increase of the amplitude of the input wave when the anchor cable and anti-slide pile work together during the earthquake. The variation law of anchor cable prestress is related to the stability of slope body, which is first reduced and then increased, and the combined force of earth pressure of anti-slide pile moves up to l / 2 due to earthquake, and the two turning points of passive earth pressure area also change obviously. When the peak value of the input seismic wave is less than 0.5 g, the displacement response of the lattice beam is smaller, and there is no acceleration amplification under the anti-slide pile in the middle of the slope, and the overall stability of the slope is good. Using the Hilbert marginal spectrum of acceleration time history, the damage characteristics of slope are studied. The results of damage identification are in agreement with the experimental monitoring data. The research results can provide guidance for the design of the combined slope protection of Anchorage cable lattice beam and anti-slide pile in seismic area.
【作者单位】：西南交通大学土木工程学院;西南交通大学交通隧道工程教育部重点实验室;
【基金】：交通运输部建设科技项目(2013318800020) 四川省科技计划项目(2015SZ0068)~~
【分类号】：TU435;P315.9

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