Centrifuge shaking table tests on tiered reinforced soil retaining walls subjected to the excitations of near-field ground motions

IF 4.7 1区 工程技术 Q1 ENGINEERING, GEOLOGICAL Geotextiles and Geomembranes Pub Date : 2023-12-17 DOI:10.1016/j.geotexmem.2023.12.001
Cheng Fan , Xuejun Liu , Yuting Zhang , Xiaoyu An , Huabei Liu
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Abstract

Tiered geosynthetic-reinforced soil (GRS) retaining walls are becoming increasingly popular in earthquake-prone areas due to their excellent earthquake resistance. Typically, near-field strong ground motion is characterized by a significant vertical component and/or a long-period velocity pulse. However, this is seldom considered in the current design of tiered GRS walls. In this study, two centrifuge shaking table tests were conducted to investigate the earthquake performance of tiered GRS walls under bidirectional and pulse-like excitations. The results revealed that under bidirectional excitation, the wall model underwent significant deformation. The confining pressures in the soil increased due to vertical motion, resulting in notable changes in the shear modulus of the backfill. Due to large differential settlement and vertical excitation, the earth pressures were significantly impacted. In the second case, pulse-like motions induced considerable shear strains in the backfill, leading to significant alterations of the shear modulus and dynamic damping of the structure. The facing exhibited distinct deformation modes, with some sliding at the toe. The peak wall displacement and reinforcement strain were both notably higher than the residual values. However, in both cases, the connections between the reinforcements and the facing endured relatively large strains, and need to be considered in seismic design.

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分层加筋土挡土墙在近场地震动激励下的离心振动台试验
分层土工合成材料加筋土(GRS)挡土墙因其出色的抗震性能,在地震多发地区越来越受欢迎。通常情况下,近场强地震动的特点是具有显著的垂直分量和/或长周期速度脉冲。然而,在目前的分层 GRS 墙体设计中很少考虑到这一点。在本研究中,进行了两次离心振动台试验,以研究分层 GRS 墙在双向和脉冲激励下的抗震性能。结果表明,在双向激励下,墙体模型发生了显著变形。土壤中的约束压力因垂直运动而增加,导致回填土的剪切模量发生显著变化。由于巨大的差异沉降和垂直激励,土压力受到了显著影响。在第二种情况下,脉冲式运动在回填土中引起了相当大的剪切应变,导致结构的剪切模量和动态阻尼发生显著变化。面层表现出明显的变形模式,在趾部出现了一些滑动。墙体位移峰值和钢筋应变均明显高于残余值。然而,在这两种情况下,钢筋与墙面之间的连接都承受了相对较大的应变,因此在抗震设计中需要加以考虑。
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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.
期刊最新文献
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