基于时域识别方法的加筋土挡墙动力特性研究  

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

作　　者：李思汉 蔡晓光 黄鑫[1,2,3,4] 景立平 张少秋 徐洪路[4] LI Sihan;CAI Xiaoguang;HUANG Xin;JING Liping;ZHANG Shaoqiu;XU Honglu(College of Geological Engineering,Institute of Disaster Prevention,Sanhe 065201,China;Hebei Key Laboratory of Earthquake Disaster Prevention and Risk Assessment,Sanhe 065201,China;Key Laboratory of Building Collapse Mechanism and Disaster Prevention,China Earthquake Administration,Sanhe 065201,China;Key Laboratory of Earthquake Engineering and Engineering Vibration,Institute of Engineering Mechanics,China Earthquake Administration,Harbin 150080,China)

机构地区：[1]防灾科技学院地质工程学院,河北三河065201 [2]河北省地震灾害防御与风险评价重点实验室,河北三河065201 [3]中国地震局建筑物破坏机理与防御重点实验室,河北三河065201 [4]中国地震局工程力学研究所地震工程与工程振动重点实验室,哈尔滨150080

出　　处：《振动与冲击》2022年第22期113-120,共8页Journal of Vibration and Shock

基　　金：地震科技星火计划(XH204402);中央高校基本科研业务费(ZY20215107);国家自然科学基金(51778144)。

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。当加速度为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。To explore the dynamic responses of a reinforced soil retaining wall(RSRW) under seismic load, the distribution of wall deformation and backfill settlement at the junction of the RSRW and the rigid box was analyzed by shaking table tests. The variation of natural frequency and damping ratio was analyzed by the time domain identification method. The acceleration amplification was explored by the mathematical fitting method. The results show that with the increase of load conditions, the facing plate presents a variety of deformation modes such as central bulging and overall outward inclination, and the settlement of the top backfill presents the distribution 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 by the Richardson and Lee method, and are close to the calculated values by the Wu Yongsheng method. The damping ratio decreases with the increase of the wall height. The acceleration amplification factor distribution in some specifications are inconsistent with the measured results. Combinedly considering the specifications and test results, the acceleration amplification factor distribution formula suitable for the modular-block RSRW was proposed.

关 键 词：模块式加筋土挡墙(RSRW) 振动台试验 时域识别方法 固有频率 阻尼比 加速度响应 

分 类 号：TH212[机械工程—机械制造及自动化] TH213.3