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Rubber Sand Mixtures (RSM) have shown remarkable potential as a Geotechnical Seismic Base Isolation (GSI) system. To evaluate the performance of the RSM as a GSI System, a two-dimensional numerical model was created using PLAXIS 2D and validated with the previous research. The study compared Peak Roof Acceleration (PRA), Peak Footing Acceleration (PFA), Peak Spectral Acceleration (PSA), time period and settlement of medium-rise buildings resting on RSM with that on pure sand. The introduction of the RSM layer as the GSI system resulted in a 21 and 35% reduction in PFA and PRA, respectively. However, the footing settlement was significantly greater than that of a building resting on sand without any RSM bed. The introduction of geogrid resulted in 71% reduction in settlement. Further due to the insertion of geogrid at a depth of 0.03 Bf(width of Raft), maximum PSA for roof reduced by 14% and maximum PSA of footing reduced by 36% as compared to building resting on pure sand.

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Numerical Study on Rubber Sand Mixture as Geotechnical Seismic Base Isolation System

  • 会议论文

  • 发表日期：

    2026年

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  • S. L. Divyasree,
  • K. M. Jithin,
  • Renjitha Varghese

摘要

Rubber Sand Mixtures (RSM) have shown remarkable potential as a Geotechnical Seismic Base Isolation (GSI) system. To evaluate the performance of the RSM as a GSI System, a two-dimensional numerical model was created using PLAXIS 2D and validated with the previous research. The study compared Peak Roof Acceleration (PRA), Peak Footing Acceleration (PFA), Peak Spectral Acceleration (PSA), time period and settlement of medium-rise buildings resting on RSM with that on pure sand. The introduction of the RSM layer as the GSI system resulted in a 21 and 35% reduction in PFA and PRA, respectively. However, the footing settlement was significantly greater than that of a building resting on sand without any RSM bed. The introduction of geogrid resulted in 71% reduction in settlement. Further due to the insertion of geogrid at a depth of 0.03 Bf(width of Raft), maximum PSA for roof reduced by 14% and maximum PSA of footing reduced by 36% as compared to building resting on pure sand.