Damage recognition and safety evaluation of retaining wall structure under environmental excitation

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (13) : 155-162.

XU Qian

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Abstract

The damages will appear within retaining wall structures in service under many factors, the damage may decrease the safety of retaining wall structures. To evaluate the safety of retaining wall structures in service, the Hilbert marginal energy ratio spectrum analysis was performed via the Hilbert-Huang Transformation of a virtual impulse response function of responses to the retaining wall structure under ambient excitation. Based on the damage sensitivity analysis of bands obtained via the Hilbert-Huang Transform, the Hilbert damage feature vector and damage index, which were used to reflected damage information of the retaining wall, were created. Tests on a pile plate retaining wall structure in service were performed. The vibration caused by vehicles was regarded as excitations. Multiple field tests on the retaining wall were performed under ambient excitations with considering the influences of environmental temperature and humidity. The damage index was used to identify the damage within the retaining wall and evaluate the safety of the wall. The tests results indicate that the value of the damage index increases continuously and the safety of the wall decreases under the persistent effects of ambient excitations. It is shown that damages appear within the wall continuously, the damage intensity of the wall increases continuously, and the stability of the wall decreases gradually. The safety of the can be evaluated via establishing quantitative relationship between the stability coefficient and damage index. In addition, the temperature and humidity have larger influences on damage accumulation. Especially, high temperature and heavy rainfall will accelerate appearance of the damage within the retaining wall. Thus, the damage index can be used to identify damages within the wall and evaluate the safety of the wall.

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damage identification / safety evaluation / field tests / retaining wall structures / ambient excitation / Hilbert damage feature vector

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XU Qian. Damage recognition and safety evaluation of retaining wall structure under environmental excitation[J]. Journal of Vibration and Shock, 2023, 42(13): 155-162

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