Experimental study on the vertical deformation performance of soilbags under horizontal cyclic shear loading

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (22) : 130-137.

FANG Binxin1，LIU Sihong1，LU Yang1，CHEN Shuang2，ZHANG Chengbin3

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Abstract

Soilbags have been gradually widely used in projects as a kind of foundation reinforcement material. Some studies show that soilbags, with a relatively higher damping ratio, could effectively dissipate the energy and reduce the transmission of seismic wavs from foundation to the superstructure. In order to investigate the deformation performance of soilbags under horizontal cyclic loads, a series of horizontal cyclic shearing tests were conducted considering the influences of the loading characteristic parameters including the number of load cycles, vertical stress and shear amplitude on the vertical deformation of soilbags, and the deformation mechanism of stacked soilbags under horizontal cyclic loads was discussed. The test results show that: (1) The accumulated vertical strain increased gradually at the initial stage and subsequently stabilized with the increasing number of load cycles; (2) The vertical strain of stacked soilbags was greatly influenced by the vertical stress and shear amplitude. The vertical strain increased with the increasing vertical stress and shear amplitude; (3) The interface slippage of stacked soilbags occurred under higher shear amplitude. The vertical strain of stacked soilbags under slipping condition kept stable at the initial stage of tests. However, the incremental vertical strain gradually amplified with the increasing number of load cycles owing to the rearrangement of infilled soil particles close to the interface between soilbags due to the weakening of shear strength at the interface induced by the repeated slippage and friction.

Key words

soilbags / cyclic shear test / strain accumulation / number of load cycles / vertical stress / shear amplitude

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FANG Binxin1，LIU Sihong1，LU Yang1，CHEN Shuang2，ZHANG Chengbin3. Experimental study on the vertical deformation performance of soilbags under horizontal cyclic shear loading[J]. Journal of Vibration and Shock, 2023, 42(22): 130-137

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