条带式刚性面板加筋土挡墙筋带应变响应特性研究

发布时间：2018-09-11 08:33

【摘要】：基于大型振动台模型试验,研究条带式刚性面板挡墙在地震波作用下筋带的应变响应特征,并结合土体相对密实度、面板位移以及频谱特征,探究加筋土挡墙的潜在损伤规律。试验结果表明:随着地震波加载幅值增大,筋带主要受力区域从潜在破坏区移至加筋稳定区;对筋带应变分析显示墙内破坏从中部开始,逐渐向下部发展,中下部更易发生破坏;潜在破裂面研究表明挡墙的破裂面形式类似0.3 H(H为墙高)折线形式,但区域大于规范上的破裂面;在0.1 g~0.3 g地震波作用下相对密实度随加载峰值增加而增大,0.4 g以后相对密实度减小,土体发生损伤,与应变规律一致;不同地震波加载前后输入的白噪声傅里叶谱显示,地震波向上传播其频谱由单峰值逐渐发展为双峰值,且0.4 g以后第二峰值频率有逐渐增大趋势。该研究成果可为更加合理地考虑地震区的加筋土挡墙结构的设计提供指导。
[Abstract]:Based on the model test of large shaking table, the strain response characteristics of stiffened retaining wall subjected to seismic waves are studied, and the potential damage law of reinforced earth retaining wall is explored by combining the relative compactness of soil, the displacement of face slab and the spectrum characteristics. The experimental results show that with the increase of the amplitude of seismic wave loading, the main stress zone of the steel band moves from the potential failure zone to the reinforced stable zone, and the strain analysis of the reinforcement band shows that the damage begins from the middle part of the wall and gradually develops to the lower part. The fracture surface of the retaining wall is similar to that of the wall (0. 3 H (H), but the area is larger than that of the normal fracture surface. Under the action of 0.1 g ~ 0.3g seismic wave, the relative compactness decreases with the increase of the peak value of loading, and the soil is damaged, which is consistent with the strain law, and the white noise Fourier spectrum before and after the loading of different seismic waves shows that the relative compactness decreases and the soil is damaged. The frequency spectrum of seismic wave propagates upward from single peak to double peak, and the second peak frequency increases gradually after 0.4 g. The research results can provide guidance for the design of reinforced earth retaining wall structure.
【作者单位】：西南交通大学土木工程学院;
【基金】：交通运输部建设科技项目(2013318800020) 四川省科技支撑项目(2015SZ0068)~~
【分类号】：TU476.4

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