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Experimental study on seismic response of geogrid reinforced rigid retaining walls with saturated backfill sand

机译:饱和回填砂土工格栅加筋刚性挡土墙地震反应的试验研究

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To study the seismic performance of geogrid reinforced rigid retaining walls with saturated backfill sand, large-scale shaking table test models were constructed in a large laminar shear container, which included geogrid reinforced rigid retaining walls and unreinforced soil retaining walls. The geometric similitude rules of test walls were confirmed by the Froude constant in dimensional analysis theories, which could be expressed by the shear velocity of the soil, and the similitude ratios of the other variables were deduced from the geometric similitude ratio. The shear wave velocities of the model grounds were tested using a seismic dilatometer. Considering the effects of ground motions, the seismic response of the retaining walls were investigated, along with wall accelerations, lateral displacements of walls, seismic settlements of the backfill sand surfaces, and the excess pore water pressures in the backfill sand and geogrid strains. Comparing the results of the test models indicated that seismic waves with long-time high acceleration values from the far field had greater effects on the seismic behaviors of the reinforced retaining wall than those from the near field, and the geogrid could still effectively improve the seismic resistance deformation abilities of the saturated geogrid reinforced rigid retaining wall. Geogrid layers could decrease the development of excess pore water pressures and accelerate the dissipation of excess pore water pressures. The middle-layer geogrids in the reinforced soil played important roles in the seismic stability of the retaining wall, and the geogrid roots connected with the walls were key parts in the seismic design of the geogrid reinforced rigid retaining wall. Seismic waves from far or mid-far fields must be considered in the seismic designs of geogrid reinforced rigid retaining walls.
机译:为了研究带有饱和回填砂土的土工格栅加筋刚性挡土墙的抗震性能,在大型层状剪切容器中构建了大型振动台试验模型,其中包括土工格栅加筋的刚性挡土墙和无筋土挡墙。尺寸分析理论中的Froude常数确定了测试墙的几何相似性规则,该规则可以用土壤的剪切速度表示,其他变量的相似性比则由几何相似性比推导得出。使用地震膨胀仪测试了模型地面的剪切波速度。考虑到地震动的影响,研究了挡土墙的地震响应,以及墙的加速度,墙体的横向位移,回填砂土表面的地震沉降,回填砂土中的多余孔隙水压力和土工格栅应变。测试模型的比较结果表明,远场的长期高加速度值地震波对加筋挡土墙的抗震性能比近场的地震波影响更大,土工格栅仍可有效改善地震饱和土工格栅加筋刚性挡土墙的抗变形能力。土工格栅层可以减少多余的孔隙水压力的发展,并加速多余孔隙水压力的消散。加筋土中层土工格栅在挡土墙的抗震稳定性中起着重要作用,与挡土墙相连的土工格栅根是土工格栅加筋刚性挡土墙抗震设计的关键部分。在土工格栅加固的刚性挡土墙的抗震设计中,必须考虑来自远中远场的地震波。

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