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| Dynamic characteristics of a reinforced soil retaining wall based on the time domain identification method |
| LI Sihan1,2,3，CAI Xiaoguang1,2,3，HUANG Xin1,2,3,4，JING Liping1,4，ZHANG Shaoqiu1，XU Honglu4 |
1.College of Geological Engineering, Institute of Disaster Prevention, Sanhe 065201, China;
2.Hebei Key Laboratory of Earthquake Disaster Prevention and Risk Assessment, Sanhe 065201, China;
3.Key Laboratory of Building Collapse Mechanism and Disaster Prevention, China Earthquake Administration, Sanhe 065201, China;
4.Key Laboratory of Earthquake Engineering and Engineering Vibration, Institute of Engineering Mechanics, China Earthquake Administration, Harbin 150080, China |
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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
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Received: 15 September 2021
Published: 28 November 2022
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