Seismic analysis of geosynthetic-reinforced soil walls in tiered configuration

IF 4.7 1区 工程技术 Q1 ENGINEERING, GEOLOGICAL
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Abstract

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.

分层配置的土工合成材料加固土墙的抗震分析
有关分层配置的土工合成材料加固土墙(GRS)的研究日益受到重视,过去主要采用数值方法。近年来,进行振动台试验以进一步探索这一领域的趋势日益明显。然而,传统的极限平衡(LE)方法在设计中更受青睐。本研究采用了一种改进的自顶向下方法,该方法基于极限平衡法和伪静力法,用于研究水平地震力对各加固层所需拉力分布的影响。该方法最初从静力分析扩展到多层 GRS 墙体的地震分析。通过参数分析,研究了水平地震系数、钢筋长度和间距、土壤内摩擦角、上下层高度比、偏移距离对两层 GRS 墙内部稳定性的影响。同时,还评估了不同地震系数下墙体抗压强度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不同,特别是在地震力较大时,下层需要更大的加固拉力来增强其稳定性。此外,临界偏移距离随着地震系数的增大而增大,并且对土壤的内摩擦角和高度比很敏感。
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来源期刊
Geotextiles and Geomembranes
Geotextiles and Geomembranes 地学-地球科学综合
CiteScore
9.50
自引率
21.20%
发文量
111
审稿时长
59 days
期刊介绍: The range of products and their applications has expanded rapidly over the last decade with geotextiles and geomembranes being specified world wide. This rapid growth is paralleled by a virtual explosion of technology. Current reference books and even manufacturers' sponsored publications tend to date very quickly and the need for a vehicle to bring together and discuss the growing body of technology now available has become evident. Geotextiles and Geomembranes fills this need and provides a forum for the dissemination of information amongst research workers, designers, users and manufacturers. By providing a growing fund of information the journal increases general awareness, prompts further research and assists in the establishment of international codes and regulations.
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