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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。
Based on the large-scale shaking table model test, the strain response characteristics of the strip under the action of the seismic wave are studied. Based on the relative density of the soil, the panel displacement and spectrum characteristics, the potential damage of the reinforced earth retaining wall . The experimental results show that with the increase of the amplitude of seismic wave loading, the main stress region of tendons moves from the potential failure zone to the reinforced stability zone. The strain analysis of tendons shows that the failure in the wall starts from the middle and gradually progresses to the lower part. The study on the potential rupture surface shows that the rupture surface of the retaining wall is similar to the broken line of 0.3 H (H is the wall height), but the area is larger than the rupture surface of the standard. The relative density of the wall with 0.1 g ~ The peak value increases and increases, the relative density decreases after 0.4 g, and the damage occurs in the soil, which is consistent with the strain law. The white noise Fourier spectra before and after different seismic waves are loaded show that the frequency spectrum of the seismic wave propagates upward gradually from single peak to Bimodal, and the second peak frequency increases gradually after 0.4 g. The results of this study can provide guidance for more reasonable consideration of the design of reinforced earth retaining wall in seismic area.