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首页> 外文期刊>Bulletin of earthquake engineering >Shaking table tests on the seismic performance of a flexible wall retaining EPS composite soil
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Shaking table tests on the seismic performance of a flexible wall retaining EPS composite soil

机译：摇动台对柔性壁保持EPS复合土壤的地震性能的测试

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摘要

A series of shaking table tests were designed and conducted to study the seismic performance of an inverted T-shape cantilever retaining wall with an anti-sliding tooth at the base using EPS composite soil as backfills. For comparison, the same wall model retaining Nanjing fine sand was simultaneously excited. The macro phenomena and seismic behaviors of two wall-soil systems are depicted in detail and analyzed. The displacement mode of the non-sliding flexible retaining wall and distribution characteristics of dynamic earth pressure acting on the wall back retaining two types of backfills are emphasized. The testing results show that, as a kind of backfill, Nanjing fine sand has a greater peak ground acceleration (PGA) than EPS composite soil under the kinematic interaction between wall and soil, while the difference in the inertial force of the retaining wall itself is not obvious. As the input peak base acceleration increases, Nanjing fine sand which possesses the compaction strength gradually transforms from the global shearing deformation to the wedge sliding deformation, while EPS composite soil with a cemented strength exhibits the block shearing deformation mode under all excitations. The tested retaining walls with the rotation displacement are non-sliding flexible walls. The dynamic deformation mode of backfills is closely related to the inertial interaction between wall and soil, which results in a significant difference in the dynamic earth pressure increment distribution between the walls retaining two types of backfills. The dynamic earth thrust in the retaining wall-Nanjing fine sand system (WSS) has a nonlinear relation with PGA, and the action position approximated 2/3 wall height. A linear relation is more suitable for retaining EPS composite soil and the corresponding action position is about 1/3 wall height. The retaining wall-EPS composite soil system is shown to have a better seismic performance in contrast to WSS. The Seed and Whitman method with 100% PGA is recommended to predict the dynamic earth thrust on the wall retaining EPS composite soil.
机译：设计并进行了一系列摇动台测试，以研究倒置的T形悬臂挡土墙在基座上使用EPS复合土壤作为回填的抗滑动齿的地震性能。为了比较，同时激发留南京细砂的相同壁模型。详细描述了两个壁土系统的宏现象和地震行为并分析。强调，强调了作用在壁上的动态接地压力的不滑动柔性保持壁和分布特性的位移模式。测试结果表明，作为一种回填，南京细砂具有比墙壁和土壤之间的运动相互作用的EPS复合土壤具有更大的峰接地加速度（PGA），而挡土墙本身的惯性力差异是不明显。随着输入峰值加速度的增加，具有压实强度的南京细砂从全球剪切变形逐渐转变为楔形滑动变形，而具有粘合强度的EPS复合土壤在所有激动下都显示出块剪切变形模式。具有旋转位移的测试的挡土墙是未滑动的柔性壁。回填的动态变形模式与墙壁和土壤之间的惯性相互作用密切相关，这导致壁之间的动态地下压力增量分布的显着差异，保持两种类型的回填。保持壁南京细砂系统（WSS）中的动态地球推力具有与PGA的非线性关系，并且动作位置近似于2/3壁高。线性关系更适合于保持EPS复合土壤，相应的动作位置约为1/3壁高。保持墙壁 - EPS复合土壤系统与WSS相比，具有更好的地震性能。建议使用100％PGA的种子和Whitman方法来预测墙壁上的动态地球推力，其保持EPS复合土壤。

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