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Geomechanics and Engineering
  Volume 37, Number 4, May25 2024 , pages 341-358

Effects of reinforcement on two-dimensional soil arching development under localized surface loading
Geye Li, Chao Xu, Panpan Shen, Jie Han and Xingya Zhang

    This paper reports several plane-strain trapdoor tests conducted to investigate the effects of reinforcement on soil arching development under localized surface loading with a loading plate width three times the trapdoor width. An analogical soil composed of aluminum rods with three different diameters was used as the backfill and Kraft paper with two different stiffness values was used as the reinforcement material. Four reinforcement arrangements were investigated: (1) no reinforcement, (2) one low stiffness reinforcement R1, (3) one high stiffness reinforcement R2, and (4) two low stiffness reinforcements R1 with a backfill layer in between. The stiffness of R2 was approximately twice that of R1; therefore, two R1 had approximately the same total stiffness as one R2. Test results indicate that the use of reinforcement minimized soil arching degradation under localized surface loading. Soil arching with reinforcement degraded more at unloading stages as compared to that at loading stages. The use of stiffer reinforcement had the advantages of more effectively minimizing soil arching degradation. As compared to one high stiffness reinforcement layer, two low stiffness reinforcement layers with a backfill layer of certain thickness in between promoted soil arching under localized surface loading. Due to different states of soil arching development with and without reinforcement, an analytical multi-stage soil arching model available in the literature was selected in this study to calculate the average vertical pressures acting on the trapdoor or on the deflected reinforcement section under both the backfill self-weight and localized surface loading.
Key Words
    arching effect; cyclic loading; reinforcement; static repetitive loading; trapdoor
Geye Li: Department of Civil Engineering, School of Environment and Safety Engineering,
North University of China, Taiyuan, Shanxi Province, China
Chao Xu: Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Department of Geotechnical Engineering,
College of Civil Engineering, Tongji University, Shanghai, China
Panpan Shen: Shanghai Investigation, Design & Research Institute Co., Ltd., Shanghai, China
Jie Han: Department of Civil, Environmental, and Architectural Engineering, the University of Kansas, Lawrence, KS, USA
Xingya Zhang: Seazen Holdings Co., Ltd., Shanghai, China

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