筋材布置方式对加筋土挡墙地震稳定性的影响

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摘要大量震后调查发现土工合成材料加筋土挡墙具有良好的抗震性能，被广泛应用于地震高烈度区的支挡结构工程中。现有基于土压力理论的抗震设计方法主要采用增加筋材长度的方式保证挡墙地震安全性，本文将考虑不同筋材布置方式开展水平地震作用下加筋土挡墙稳定性分析，通过计算极限状态加筋土挡墙稳定所需加筋力评价其稳定性，为其抗震设计提供新思路。结果分析表明：合理的筋材布置方式可以有效提高挡墙地震稳定性，局部筋材加长应选在挡墙中间区域，可以减小最大加筋力约30%；短筋布置长度宜在1.5m~2.0m，最大加筋力减少约25%，同时显著减少面板连接力，地震条件可降低一半；变间距布置方式减少最大加筋力约30%，但是大间距区域面板连接力会变大。强震条件下，局部加长和变间距布置效果最好，此时挡墙最危险破坏面接近复合破坏模式，建议加筋土挡墙抗震设计需要选择最合适的筋材布置方式。
关键词：土工合成材料；加筋土挡墙；地震；稳定性分析；抗震设计

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	朱玉明1
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	张飞1
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	戴光宇1
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关键词 ：土工合成材料, 加筋土挡墙, 地震, 稳定性分析, 抗震设计

Abstract：Numerous post-earthquake investigations have found Geosynthetic-Reinforced Soil (GRS) walls have excellent seismic performance and are widely applied to retaining structure projects in high seismic intensity areas. Seismic design methods based on active earth pressure theory are still primarily used to increase the length of reinforcement to secure the seismic safety of GRS walls. The stability analysis of GRS walls subjected to horizontal seismic excitations is developed in this paper by considering different ways of reinforcement layout, evaluating the stability of GRS walls by determining the required reinforcement strength for their stability in the limit state, and providing new ideas for seismic design. The results indicate that a reasonable layout of reinforcement is able to effectively improve the seismic stability of the GRS wall, and the partial lengthening layout of reinforcement should be chosen in the middle zone of the GRS wall, which can decrease the maximum reinforcement strength by about 30%; the length of secondary reinforcement layout should be 1.5m ~ 2.0m, reducing the maximum reinforcement strength by about 25%, and significantly reducing the connection strength, which can reduce the seismic condition by half; the variable spacing layout reduces the maximum reinforcement strength by about 30%, however, the connection strength will become larger in the large spacing zone. Strong seismic condition, partial lengthening and variable spacing layout have the best performance, when the most critical failure surface of the GRS wall is close to the compound failure pattern, it is necessary to select the most suitable reinforcement layout for the seismic design of GRS wall is recommended
Key words: geosynthetics; reinforced wall; earthquake; stability analysis; seismic design

Key words： geosynthetics reinforced wall earthquake stability analysis seismic design

收稿日期: 2021-11-08 出版日期: 2022-12-28

引用本文:

朱玉明1,2，张飞1,2，贾世林1,2，戴光宇1,2. 筋材布置方式对加筋土挡墙地震稳定性的影响[J]. 振动与冲击, 2022, 41(24): 88-96.
ZHU Yuming1,2，ZHANG Fei1,2，JIA Shilin1,2，DAI Guangyu1,2. Effect of reinforcement layout on the seismic stability of GRS walls. JOURNAL OF VIBRATION AND SHOCK, 2022, 41(24): 88-96.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2022/V41/I24/88

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