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