<p>To understand the pore pressure dissipation in granular columns installed in liquefiable ground comprising of sand/silt, it is essential to determine their consolidation characteristics. This study investigates the influence of granular columns on the consolidation and compressibility characteristics in different soils (sand, silt, and clay) using a modified one-dimensional consolidation apparatus. Three geometric ratios (influence diameter/column diameter), <i>N</i> = 6, <i>N</i> = 4, and <i>N</i> = 3 have been adopted. The results show a substantial reduction in the vertical deformation, with an improvement of 35% in clay, and 25% in silt and sand with the introduction of granular column. The influence of <i>N</i> on deformation is minimal, ranging from 2 to 8% in sand and silt, however in clay a significant improvement of about 16% was observed. The ratio of coefficient of horizontal to vertical consolidation (<i>c</i><sub><i>h</i></sub><i>/c</i><sub><i>v</i></sub>) ranges from 4 to 9 in clay and 2 to 4 in silt and sand. The impact of <i>N</i> has a negligible effect on <i>c</i><sub><i>h</i></sub> value in sand with an increase of 2 to 6%, while in silt the increase of 16 to 24%, and in clay a substantial 30 to 75% increase was observed. The findings highlight the influence of surrounding soil type and <i>N</i> on the effectiveness of granular columns in improving the consolidation and deformation characteristics.</p>

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Simplistic Estimation of Consolidation and Compressibility Characteristics of Different Soils Improved with Granular Columns

  • P. Kiruthika,
  • P. Vijayasree,
  • A. Murali Krishna,
  • Subhadeep Banerjee

摘要

To understand the pore pressure dissipation in granular columns installed in liquefiable ground comprising of sand/silt, it is essential to determine their consolidation characteristics. This study investigates the influence of granular columns on the consolidation and compressibility characteristics in different soils (sand, silt, and clay) using a modified one-dimensional consolidation apparatus. Three geometric ratios (influence diameter/column diameter), N = 6, N = 4, and N = 3 have been adopted. The results show a substantial reduction in the vertical deformation, with an improvement of 35% in clay, and 25% in silt and sand with the introduction of granular column. The influence of N on deformation is minimal, ranging from 2 to 8% in sand and silt, however in clay a significant improvement of about 16% was observed. The ratio of coefficient of horizontal to vertical consolidation (ch/cv) ranges from 4 to 9 in clay and 2 to 4 in silt and sand. The impact of N has a negligible effect on ch value in sand with an increase of 2 to 6%, while in silt the increase of 16 to 24%, and in clay a substantial 30 to 75% increase was observed. The findings highlight the influence of surrounding soil type and N on the effectiveness of granular columns in improving the consolidation and deformation characteristics.