悬臂式加筋土复合支挡结构振动台模型试验研究

doi:10.13722/j.cnki.jrme.2020.0514

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摘要在墙后填土中布设拉筋可有效改善支挡结构的抗震性能。为此开展悬臂式加筋土组合支挡结构在频率5 Hz正弦波加载条件下的振动台模型试验，测试了小震0.11 g、中震0.24 g、大震0.39 g作用下，模型挡墙及墙后填土的振动加速度、墙背动土压力、墙体振动位移、筋带动拉力等时空响应特征，分析模型结构动力特性、墙–土相互作用及加筋体承载等随加载加速度的变化规律。试验表明：加速度在墙后填土中向上传播存在相位延迟和非线性放大效应，并随加载幅值呈加大趋势；以墙体承受指向临空面的最大惯性力时刻作为挡墙稳定最不利的主动位移状态，墙背动土压力与墙体惯性力峰值间的同步性随加载幅值逐渐提高，大震下填土追挤墙体作用较强，动土压力沿墙高呈“上大下小”分布，合力作用点高于2/3倍墙高；筋带动拉力随加载幅值呈加速增大，在空间上呈非均匀分布，反映潜在破裂面位置的筋带最大拉力点连线近似呈过底板墙踵的折线型分布。

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	魏明1
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	罗强1
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	蒋良潍1
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	王腾飞1
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	左得奇1
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关键词 ：土力学, 悬臂式挡土墙, 填土加筋, 振动台模型试验, 加速度, 动土压力

Abstract：The application of reinforcement elements in compacted backfill can significantly improve the seismic resistance of a retaining structure. In this paper，shaking table tests were performed on cantilevered reinforced earth retaining walls under sine wave loading at a frequency of 5 Hz，and the response acceleration of the model wall and the backfill，the dynamic earth pressure and displacement of the wall，and the dynamic tensile force of the reinforcement were monitored under 0.11 g(minor)，0.24 g(moderate) and 0.39 g(major) accelerations. The variations of dynamic characteristics of the model structure，the interaction between the wall and the backfill，and the stress level of the reinforcement with different imposed accelerations were illuminated. The results show that the propagation of the acceleration in the backfill shows hysteresis and nonlinear amplification effects and the acceleration tends to increase with rising the vibration amplitude. The most unfavorable condition(critical state) of the system stability means that the wall moves away from the backfill under the maximum inertia force. The synchronization between the peak dynamic earth pressure on the wall back and the peak inertia force of the wall becomes more pronounced with larger acceleration amplitude. The earth pressure acting on the wall is more significant with an acceleration of 0.39 g. The dynamic earth pressure acting on the upper portion of the wall is generally higher than that on the lower portion，and the resultant force acts at approximately 2/3 of the height of the wall，much larger than that obtained from the current code. The dynamic tensile force of the reinforcement increasing with the acceleration amplitude presents an inhomogeneous spatial distribution，and the connecting line of the points of the maximal tensile force reflecting the potential failure surface shows piecewise linear through the end of the slab base.

Key words： soil mechanics cantilever retaining wall reinforced backfill shaking table test acceleration dynamic earth pressure

引用本文:

魏明1，2，罗强1，2，蒋良潍1，2，王腾飞1，2，左得奇1，2. 悬臂式加筋土复合支挡结构振动台模型试验研究[J]. 岩石力学与工程学报, 2021, 40(3): 607-618.
WEI Ming1，2，LUO Qiang1，2，JIANG Liangwei1，2，WANG Tengfei1，2，ZUO Deqi1，2. Shaking table tests of cantilevered reinforced soil retaining walls. , 2021, 40(3): 607-618.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2020.0514 或 http://rockmech.whrsm.ac.cn/CN/Y2021/V40/I3/607

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