【摘要】 设计并完成了1:2.5比例尺的绿色加筋格宾挡土墙大型模型试验。试验模型长×宽×高为3.00m×0.85m×2.00m,坡角为70°,填料采用工程现场所用的红砂岩材料制备。双绞合六边形金属格宾网由聚氯乙烯(PVC)包裹,并镀锌防腐,网面单元长×宽为80mm×100mm。通过输入不同类型和幅值的地震波激励,探讨地震作用下模型挡墙的动力特性与动力响应规律。试验结果表明:绿色加筋格宾挡土墙对输入加速度有明显的放大效应;沿墙高方向,水平加速度放大倍数的增量比较平缓,随着墙高的增大,水平加速度有增大趋势;在不同类型地震波作用下,加速度响应有明显差异;墙面板的水平加速度放大倍数随振幅增大呈现明显的递减趋势,基本上呈线性变化;竖向加速度峰值响应在墙面及墙顶显著增大,可达到台面水平加速度峰值的50%左右。更多还原

【Abstract】 A large-scale model test of green reinforced gabion walls with the scale of 1:2.5 was introduced. The model wall filled with red sandstone was built with length of 3.00 m, height of 2.00 m, width of 0.85 m, and a slope angle of 70°. PVC-coated heavy galvanization of double twisted hexagonal wire mesh was used in the test, and the wire mesh specimens were 80 mm×100 mm. A series of tests were performed with different input seismic wave kinds and amplitudes. The dynamic characteristics and dynamic responses of model wall under horizontal seismic loading were discussed. The results show that there is a significant amplification effect of input acceleration in green reinforced gabion walls. The increment slope of horizontal acceleration magnification times are flatter with the wall height. With the increase of high wall, there is an augmentation trend to horizontal acceleration. Acceleration response has significant difference under the function of different types of seismic waves. The magnification times of lateral acceleration tend are less obvious with the increase of amplitude, and the whole change shows a mainly linear stage. Vertical acceleration peaks both in the wall face and at the top of the wall increase greatly, reaching about 50% of lateral acceleration peak of table.更多还原