Aiming at the seismic response of plastic geogrid-reinforced embankments, with Zhounan Expressway as the research engineering background, a self-designed seismic-rainfall coupled slope model test system was designed and used to produce 1 : 20 scale plastic geogrid-reinforced embankments. Moreover, the physical model of the unreinforced embankment under Hanshin wave, Wenchuan wave, Tianjin wave, etc. was also studied to carry out comparative analysis on seismic response and dynamic response on test model. The dynamic characteristics and dynamic response of the embankment model were tested from low to high seismic intensity; the changes of the embankment’s natural frequency, damping ratio, acceleration at the measuring point, and dynamic earth pressure were analyzed; and the main influencing factors and damage to the embankment seismic response feature were discussed herein. The test results showed that the initial natural frequency of the reinforced embankment was 42.4% higher than that of the unreinforced embankment, and its initial damping ratio reduced by 19.4%. The attenuation effect of the natural frequency and damping ratio of the reinforced embankment with the loading history was significantly lower than that of the unreinforced embankment. Embankment reinforcement exhibited a very good inhibitory effect on the PGA amplification effect of the embankment, and the inhibitory effect on the interior of the slope was more significant than that on the slope. Moreover, the type of seismic wave, the amplitude of the seismic wave, and the frequency of the seismic wave significantly influenced the PGA amplification effect of the embankment. The peak dynamic soil pressure of the unreinforced embankment at the same location was significantly greater than that of the reinforced embankment. The two embankment models showed significantly different antivibration damage performance. After the peak acceleration of 2 m s^-2 was loaded, no cracks were seen on the surface of the embankment model. When the peak acceleration of 3 m s^-2 was loaded, on the slopes of the two embankment models, smaller cracks were observed in the middle and upper parts of the face. When the peak acceleration of 4 m s^-2 was loaded, the failure of the unreinforced embankment model was obvious. Large cracks on the top of the slope could reach 16 mm in width, and 27 mm settlement appeared at the top, and the slope was convex. The reinforced embankment model was only on the slope shoulder. Moreover, there were fine cracks on the top, and the slope top settlement was less than 5 mm. The research results provide theoretical support for preventing and controlling the road embankment vibration diseases and improving highway durability design.

中文翻译：

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地震作用下高速公路塑料加筋土路堤动力响应模型试验研究

针对塑料土工格栅加筋路堤的地震反应，以周南高速公路为研究工程背景，设计了一套自行设计的地震-降雨耦合边坡模型试验系统，并用于生产1:20比例的塑料土工格栅加筋路堤。此外，还研究了阪神波浪，汶川波浪，天津波浪等非加筋路堤的物理模型，对试验模型的地震响应和动力响应进行了比较分析。从低地震烈度到高地震烈度对路堤模型的动力特性和动力响应进行了测试。分析了路堤的固有频率，阻尼比，测量点加速度和动土压力的变化。讨论了路堤地震响应特征的主要影响因素和破坏情况。试验结果表明，加筋路堤的初始固有频率比未加筋路堤的固有频率高42.4％，其初始阻尼比降低了19.4％。加筋路堤的固有频率和阻尼比随荷载历程的衰减效果明显低于未加筋路堤。路堤加固对路堤的PGA放大作用表现出很好的抑制作用，对边坡内部的抑制作用比对边坡的抑制作用更显着。此外，地震波的类型，地震波的振幅，地震波的频率显着影响了路堤的PGA放大效果。同一位置的未加固路堤的峰值动态土压力显着大于加固路堤的峰值。两种路堤模型均显示出显着不同的抗振破坏性能。经过2 m s的峰值加速度加载了^-2，在路堤模型的表面上没有看到裂缝。当加载3 m s ^-2的峰值加速度时，在两个路堤模型的斜坡上，在工作面的中部和上部观察到较小的裂缝。当峰值加速度为4 m s ^-2加载后，无筋路堤模型的失败是显而易见的。斜坡顶部的大裂缝宽度可达16毫米，顶部出现27毫米的沉降，斜坡呈凸形。加筋路堤模型仅在斜坡路肩上。此外，顶部有细微的裂缝，坡顶沉降小于5毫米。研究结果为防治路堤振动病，提高公路耐久性设计提供了理论支持。