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

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Journal of Vibration and Shock ›› 2022, Vol. 41 ›› Issue (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

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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

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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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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