Model tests for effect of fill reinforcement on seismic response of cantilever retaining wall

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Journal of Vibration and Shock ›› 2022, Vol. 41 ›› Issue (19) : 237-247.

WEI Ming1,2, LUO Qiang1,2, JIANG Liangwei1,2, WANG Tengfei1,2, ZHANG Liang1,2, LIAN Jifeng3

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Abstract

In order to investigate the effect of backfill reinforcement on the seismic performance of cantilever retaining wall, shaking table tests on a 1/4 scale model of backfill reinforced and unreinforced behind cantilever retaining wall were conducted. The model structures were excited by simple harmonics of 0.11g for minor earthquake, 0.24g for moderate earthquake and 0.39g for major earthquake, and the responses such as acceleration, displacement and earth pressure were obtained. The influence of soil reinforcement on the natural frequency and damping ratio of the model is analyzed. The differences of seismic responses such as acceleration amplification factor, vibration displacement and wall-soil interaction are compared, and the characteristics of seismic mitigation effect of backfill reinforcement with loading amplitude are discussed. The results show that the backfill reinforcement can enhance the integrity of the wall-soil system and reduce the vibration damage, and the variation range of natural frequency and damping ratio after vibration are smaller than that of the unreinforced model; Backfill reinforcement measures can cause obvious phase misalignment between inertia force and seismic earth pressure on the wall under minor and moderate earthquakes, and greatly reduce the seismic earth pressure on the wall in the state of unfavorable displacement. However, the horizontal displacement of the wall is less than that of backfill under major earthquake, and the backfill chases and squeezes the wall significantly, and the seismic mitigation effect is not fully exerted.
Key words: cantilever retaining wall; shaking table test; backfill reinforcement; seismic response; seismic mitigation effect

Key words

cantilever retaining wall / shaking table test / backfill reinforcement / seismic response / seismic mitigation effect

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WEI Ming1,2, LUO Qiang1,2, JIANG Liangwei1,2, WANG Tengfei1,2, ZHANG Liang1,2, LIAN Jifeng3. Model tests for effect of fill reinforcement on seismic response of cantilever retaining wall[J]. Journal of Vibration and Shock, 2022, 41(19): 237-247

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