基于振动台试验的加筋土挡墙台阶效应分析

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摘要台阶设置及台阶数量是加筋土挡墙结构设计的重要问题。通过振动台缩尺模型试验，对比分析总高度相同的单级、双级和三级模块式土工格栅加筋土挡墙的地震响应差异，旨在探究加筋土挡墙的台阶效应。试验结果表明：台阶设置对提高挡墙的整体稳定性具有积极作用。然而，台阶数量的增加对这一效果的贡献相对有限。挡墙的自振频率和振前阻尼比并未因台阶设置及其数量而发生显著变化，但台阶的存在显著降低了墙体加速度放大系数、墙面水平位移、填土顶部沉降、地震主动土压力以及筋材应变等关键参数。此外，三组模型的加速度放大系数沿墙高呈现非线性增长，并在墙顶部达到峰值。地震作用下的主动土压力沿墙体高度同样表现为非线性分布，其峰值多出现在各阶墙底。随着加载加速度的增加，3组模型的筋材应变增量也随之增加，并沿墙高展现出非线性趋势。台阶式加筋土挡墙的下阶墙体筋材应变普遍高于上阶。研究结果可为加筋土挡墙的设计选型提供参考。

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	蔡博渊1
	蔡晓光2
	3
	4
	李思汉1
	2
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	景立平5
	徐洪路5
	张艳6

关键词 ：土力学, 加筋土挡墙, 振动台试验, 台阶设计, 台阶数量, 动力特性

Abstract：The configuration and number of tiers are critical issues in the structural design of reinforced soil retaining walls. Through shaking table scaled model tests，comparative analyses were conducted on the seismic responses of single-tiered，two-tiered，and three-tiered modular geogrid-reinforced soil retaining walls with the same total height，aiming to investigate the tier effect in reinforced soil retaining walls. The test results show that the setting of tiers has a positive role in enhancing the overall stability of the retaining wall. However，the increase in the number of tiers contributes relatively little to this effect. The natural frequency and pre-vibration damping ratio of the retaining wall did not change significantly due to the setting of tiers and their quantity，but the presence of tiers significantly reduced key parameters such as the wall's acceleration amplification factor，horizontal displacement of the wall face，settlement at the top of the backfilled soil，earthquake-induced active soil pressure，and reinforcement strain. Additionally，the acceleration amplification factor of the three models increased nonlinearly along the wall height and reached a peak at the top of the wall. The active soil pressure under seismic action also exhibited a nonlinear distribution along the wall height，with peaks mostly occurring at the bottom of each tiered wall. As the loading acceleration increased，the incremental strain of the reinforcements in the three models also increased，showing a nonlinear trend along the wall height. The strain of the reinforcements in the lower tiers of the tiered reinforced soil retaining walls was generally higher than that in the upper tiers. The research results can provide a reference for the design and selection of reinforced soil retaining walls.

Key words： soil mechanics reinforced soil retaining wall shaking table test tier design number of tiers dynamic characteristics

引用本文:

蔡博渊1，蔡晓光2，3，4，李思汉1，2，3，景立平5，徐洪路5，张艳6. 基于振动台试验的加筋土挡墙台阶效应分析[J]. 岩石力学与工程学报, 2024, 43(12): 3108-3120.
CAI Boyuan1，CAI Xiaoguang2，3，4，LI Sihan1，2，3，JING Liping5，XU Honglu5，ZHANG Yan6. Analysis of tiers effect of geosynthetic-reinforced soil retaining walls based on shaking table tests. , 2024, 43(12): 3108-3120.

链接本文:

https://rockmech.whrsm.ac.cn/CN/Y2024/V43/I12/3108

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