Research on geosynthetic-reinforced soil (GRS) walls in tiered configurations is increasing gaining attention, with numerical methods being predominantly used in the past. In recent years, there has been a growing trend in conducting shaking table tests to further explore this area. However, traditional limit equilibrium (LE) methods are more preferred for design purposes. This study utilized a modified top-down approach, which is based on LE and pseudo-static methods to investigate the horizontal seismic force on the distribution of required tension along each reinforcement layer. The approach is initially extended from static analysis to seismic analysis for multitiered GRS walls. Parametric analyses are conducted to study the impacts that horizontal seismic coefficient, reinforcement length and spacing, internal friction angle of soil, height ratio of upper/lower tier, offset distance have on the internal stability of two-tiered GRS walls. Meanwhile, influences of wall batter and number of tiers on the critical offset distance for different seismic coefficients are assessed. Results indicate that the internal stability differs between the upper and lower tiers under seismic conditions, particularly with higher seismic forces, where the lower tier requires greater reinforcement tension to enhance its stability. Additionally, the critical offset distance grows with the increase in seismic coefficient, and it is sensitive to the internal friction angle of soil and the height ratio.

中文翻译：

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分层结构土工合成材料加筋土墙的地震分析


分层结构的土工合成材料加筋土（GRS）墙的研究越来越受到关注，过去主要使用数值方法。近年来，通过振动台试验来进一步探索这一领域的趋势日益明显。然而，出于设计目的，传统的极限平衡 (LE) 方法更受青睐。本研究采用了一种改进的自上而下方法，该方法基于 LE 和伪静力方法来研究水平地震力对沿每个加固层所需张力分布的影响。该方法最初从多层 GRS 墙的静态分析扩展到地震分析。通过参数分析研究了水平抗震系数、钢筋长度和间距、土体内摩擦角、上下层高比、偏置距离对两层GRS墙内部稳定性的影响。同时，评估了不同地震系数下墙体和层数对临界偏移距离的影响。结果表明，在地震条件下，上层和下层的内部稳定性存在差异，特别是在地震力较高的情况下，下层需要更大的钢筋拉力来增强其稳定性。另外，临界偏置距随地震系数的增大而增大，且对土体内摩擦角和高度比敏感。