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The earthquakes experienced in the world, and India emphasizes the importance of studying the response of various infrastructures to seismic activity. Study of seismic behavior of retaining structures is pivotal as it enables the development to find engineering solutions to mitigate risks, protect the infrastructure against earthquake-induced hazards. Numerous experimental and analytical research has demonstrated that geofoam is an effective deformable inclusion when subjected to seismic forces during earthquakes, highlighting its capacity to absorb and redistribute seismic energy. In this study, experimental investigations were conducted on retaining walls using both rigid and laminar shear boxes, which take into account different aspects like boundary conditions, the effect of seismic vibration, backfill material, and the extent of geofoam to act as a seismic isolator. Expanded polystyrene (EPS 18) geofoam of 18 kg/m3 density was placed vertically behind the retaining wall in addition to the traditional backfill of sand material. Retaining wall models of two different heights were prepared using cement concrete mortar, and the behavior of retaining walls in accordance with dynamic earth pressure and horizontal displacement during seismic loading was observed. Experimental analysis reveals a substantial reduction in dynamic earth pressure exerted on retaining walls by 35 and 31% through the incorporation of geofoam during model tests conducted with rigid and laminar shear boxes, respectively.

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Experimental Investigation on Dynamic Response of Cantilever Retaining Walls with Deformable Inclusions: A Comparative Study of Rigid and Laminar Shake Table Testing with and without Inclusion

  • 会议论文

  • 发表日期：

    2026年

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  • R. J. Vyawahare,
  • A. I. Dhatrak,
  • S. W. Thakare

摘要

The earthquakes experienced in the world, and India emphasizes the importance of studying the response of various infrastructures to seismic activity. Study of seismic behavior of retaining structures is pivotal as it enables the development to find engineering solutions to mitigate risks, protect the infrastructure against earthquake-induced hazards. Numerous experimental and analytical research has demonstrated that geofoam is an effective deformable inclusion when subjected to seismic forces during earthquakes, highlighting its capacity to absorb and redistribute seismic energy. In this study, experimental investigations were conducted on retaining walls using both rigid and laminar shear boxes, which take into account different aspects like boundary conditions, the effect of seismic vibration, backfill material, and the extent of geofoam to act as a seismic isolator. Expanded polystyrene (EPS 18) geofoam of 18 kg/m3 density was placed vertically behind the retaining wall in addition to the traditional backfill of sand material. Retaining wall models of two different heights were prepared using cement concrete mortar, and the behavior of retaining walls in accordance with dynamic earth pressure and horizontal displacement during seismic loading was observed. Experimental analysis reveals a substantial reduction in dynamic earth pressure exerted on retaining walls by 35 and 31% through the incorporation of geofoam during model tests conducted with rigid and laminar shear boxes, respectively.