基于时域识别方法的加筋土挡墙动力特性研究

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振动与冲击 ›› 2022, Vol. 41 ›› Issue (22) : 113-120.

论文

李思汉1,2,3，蔡晓光1,2,3，黄鑫1,2,3,4，景立平1,4，张少秋1，徐洪路4

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Dynamic characteristics of a reinforced soil retaining wall based on the time domain identification method

LI Sihan1,2,3，CAI Xiaoguang1,2,3，HUANG Xin1,2,3,4，JING Liping1,4，ZHANG Shaoqiu1，XU Honglu4

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文章历史 +

摘要

为探究加筋土挡墙(reinforced soil retaining wall ，RSRW)在地震荷载作用下的动力响应变化规律，结合振动台试验分析挡墙与刚性箱连接处的墙面变形和回填土沉降分布规律，利用时域识别方法分析挡墙的固有频率和阻尼比的变化规律，利用数理拟合方法探究加速度放大分布规律。结果表明：随着荷载条件的增加，面板呈现出中心鼓胀、整体外倾等多种变形模式；顶部回填土沉降呈现出均匀沉降和凸起差异沉降的分布规律。在1.0g以下时，固有频率的实测结果在Richardson 和Lee方法的预测范围内，与伍永胜方法的计算值接近。阻尼比随墙高的增加而减小。部分规范中加速度放大系数分布规律与实测结果不一致，结合规范和试验结果，提出了适用于模块式加筋土挡墙的加速度放大系数分布公式。
关键词：模块式加筋土挡墙；振动台试验；时域识别方法；固有频率；阻尼比；加速度响应

Abstract

To explore the variation law of dynamic response of reinforced soil retaining wall (RSRW) under seismic load, the distribution law of wall deformation and backfill settlement at the junction of RSRW and rigid box was analyzed by shaking table test. The variation law of natural frequency and damping ratio was analyzed by time domain identification method. The law of acceleration amplification was explored by mathematical fitting method. The results show that with the increase of load conditions, the facing presents a variety of deformation modes such as central bulging and overall outward inclination, and the settlement of the top backfill presents the distribution law of uniform settlement and convex differential settlement. When the acceleration input is less than 1.0g, the measured results of natural frequency are within the prediction range of Richardson and Lee methods, and are close to the calculated values of Wu Yongsheng method. The damping ratio decreases with the increase of the wall height. The laws of acceleration amplification factor distribution in some specifications are inconsistent with the measured results. Combined with the specifications and test results, the acceleration amplification factor distribution formula suitable for modular-block RSRW is proposed.
Key words: Modular-block reinforced soil retaining wall; Shaking table test; Time domain identification method; Natural frequency; Damping ratio; Acceleration response

导出引用

李思汉1,2,3，蔡晓光1,2,3，黄鑫1,2,3,4，景立平1,4，张少秋1，徐洪路4. 基于时域识别方法的加筋土挡墙动力特性研究[J]. 振动与冲击, 2022, 41(22): 113-120

LI Sihan1,2,3，CAI Xiaoguang1,2,3，HUANG Xin1,2,3,4，JING Liping1,4，ZHANG Shaoqiu1，XU Honglu4. Dynamic characteristics of a reinforced soil retaining wall based on the time domain identification method[J]. Journal of Vibration and Shock, 2022, 41(22): 113-120

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