填土加筋对悬臂式挡墙地震响应影响的模型试验研究

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摘要为探讨墙后填土加筋对悬臂式挡墙抗震性能的改善效果，开展了缩尺比1:4的悬臂式挡墙及墙后填土加筋的振动台模型试验。采用小震0.11g、中震0.24g、大震0.39g的简谐波激励模型结构，获得加速度、位移、土压力等响应量，分析了填土加筋对模型自振频率和阻尼比的影响，对比了加速度放大系数、振动位移、墙-土相互作用等地震响应差异，讨论了填土加筋的减震效应随加载幅值变化特征。试验表明：填土加筋可提高墙-土体系的整体性、减小振动伤损，自振频率和阻尼比在历经振动后的变化幅度相对未加筋模型更小；加筋措施可使小震和中震下墙体惯性力与地震土压力产生明显相位错峰，大幅降低不利位移状态时墙体承受的地震土压力，但大震下墙体水平位移小于填土，墙-土挤压作用显著，减震效应发挥欠充分。
关键词：悬臂式挡墙；振动台试验；填土加筋；地震响应；减震效应

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	魏明1
	2
	罗强1
	2
	蒋良潍1
	2
	王腾飞1
	2
	张良1
	2
	连继峰3

关键词 ：悬臂式挡墙, 振动台试验, 填土加筋, 地震响应, 减震效应

Abstract：In order to investigate the effect of backfill reinforcement on the seismic performance of cantilever retaining wall, shaking table tests on a 1/4 scale model of backfill reinforced and unreinforced behind cantilever retaining wall were conducted. The model structures were excited by simple harmonics of 0.11g for minor earthquake, 0.24g for moderate earthquake and 0.39g for major earthquake, and the responses such as acceleration, displacement and earth pressure were obtained. The influence of soil reinforcement on the natural frequency and damping ratio of the model is analyzed. The differences of seismic responses such as acceleration amplification factor, vibration displacement and wall-soil interaction are compared, and the characteristics of seismic mitigation effect of backfill reinforcement with loading amplitude are discussed. The results show that the backfill reinforcement can enhance the integrity of the wall-soil system and reduce the vibration damage, and the variation range of natural frequency and damping ratio after vibration are smaller than that of the unreinforced model; Backfill reinforcement measures can cause obvious phase misalignment between inertia force and seismic earth pressure on the wall under minor and moderate earthquakes, and greatly reduce the seismic earth pressure on the wall in the state of unfavorable displacement. However, the horizontal displacement of the wall is less than that of backfill under major earthquake, and the backfill chases and squeezes the wall significantly, and the seismic mitigation effect is not fully exerted.
Key words: cantilever retaining wall; shaking table test; backfill reinforcement; seismic response; seismic mitigation effect

Key words： cantilever retaining wall shaking table test backfill reinforcement seismic response seismic mitigation effect

收稿日期: 2021-06-07 出版日期: 2022-10-15

引用本文:

魏明1,2，罗强1,2，蒋良潍1,2，王腾飞1,2，张良1,2，连继峰3. 填土加筋对悬臂式挡墙地震响应影响的模型试验研究[J]. 振动与冲击, 2022, 41(19): 237-247.
WEI Ming1,2, LUO Qiang1,2, JIANG Liangwei1,2, WANG Tengfei1,2, ZHANG Liang1,2, LIAN Jifeng3. Model tests for effect of fill reinforcement on seismic response of cantilever retaining wall. JOURNAL OF VIBRATION AND SHOCK, 2022, 41(19): 237-247.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2022/V41/I19/237

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