This particular study has been dedicated to investigate the pull-out capacity of batter pile by means of finite element software PLAXIS-3D. A pile of length 10 m and diameter of 0.4 m is simulated. The elastic model is chosen for the pile and Mohr–Coulomb failure criterion is utilized for the soil. Following a successful validation, the parametric study has been performed by considering various factors such as batter angle (10°, 20°, 30° and 40°), embedment ratio L/D (15, 25 and 35) and soils (sand and clay). From the analysis it has been found out that the most efficient batter angle to achieve the highest pull-out capacity for an embedment ratio (L/D) of 15 is 10° and for 25 and 35, it is 20° embedded in sand. For clayey soils, the optimum batter angle is 30° for an L/D ratio of 15 and 25, and it is 10° for an L/D ratio of 35. Subsequently the top soil is replaced layer-wise to improve the pull-out capacity of pile by placing geogrid from surface to a depth of 2.5 times the diameter of pile. The analysis has been done by considering optimum angles for different L/D ratios in sand and clay. Optimum batter angles and depth of placement of geogrid from the surface have been found out. The optimum depth of geogrid placement is 0.5D for L/D ratios of 15 and 25, and 1.5D for an L/D ratio of 35 for sands. For clays geogrid is placed at 1.5D for all embedded ratios.

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Pull-Out Capacity of Batter Piles in Geogrid Reinforced Soil by Using FEM Analysis

  • Satheeshkumar Tankara,
  • Sangbanabi Devi,
  • Sanjit Biswas,
  • Sourabh Roy

摘要

This particular study has been dedicated to investigate the pull-out capacity of batter pile by means of finite element software PLAXIS-3D. A pile of length 10 m and diameter of 0.4 m is simulated. The elastic model is chosen for the pile and Mohr–Coulomb failure criterion is utilized for the soil. Following a successful validation, the parametric study has been performed by considering various factors such as batter angle (10°, 20°, 30° and 40°), embedment ratio L/D (15, 25 and 35) and soils (sand and clay). From the analysis it has been found out that the most efficient batter angle to achieve the highest pull-out capacity for an embedment ratio (L/D) of 15 is 10° and for 25 and 35, it is 20° embedded in sand. For clayey soils, the optimum batter angle is 30° for an L/D ratio of 15 and 25, and it is 10° for an L/D ratio of 35. Subsequently the top soil is replaced layer-wise to improve the pull-out capacity of pile by placing geogrid from surface to a depth of 2.5 times the diameter of pile. The analysis has been done by considering optimum angles for different L/D ratios in sand and clay. Optimum batter angles and depth of placement of geogrid from the surface have been found out. The optimum depth of geogrid placement is 0.5D for L/D ratios of 15 and 25, and 1.5D for an L/D ratio of 35 for sands. For clays geogrid is placed at 1.5D for all embedded ratios.