Geomechanics and Engineering

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Effects of reinforcement on two-dimensional soil arching development under localized surface loading

  • Geye Li (Department of Civil Engineering, School of Environment and Safety Engineering, North University of China) ;
  • Chao Xu (Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Department of Geotechnical Engineering, College of Civil Engineering, Tongji University) ;
  • Panpan Shen (Shanghai Investigation, Design & Research Institute Co., Ltd.) ;
  • Jie Han (Department of Civil, Environmental, and Architectural Engineering, the University of Kansas) ;
  • Xingya Zhang (Seazen Holdings Co., Ltd.)
  • Received : 2022.06.24
  • Accepted : 2024.04.25
  • Published : 2024.05.25
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Abstract

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.

Keywords

Acknowledgement

The results presented in this paper are part of the research projects (No. 51478349 & No. 41272293) sponsored by the National Natural Science Foundation of China. This financial support is greatly appreciated.

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