Bearing Capacity Analysis of Bored Pile Foundation and Settlement on Clay Soil

Abstract

The foundation is one of the most important elements in a building. The foundation serves to

forward the load of the structure above it to the soil layer below. In the construction of the Tawang- Ngalang Bridge segment IV built on clay soil, a type of bored pile foundation with a diameter of 1

meter with a depth of 12 meters will be used. Researchers want to re-analyze the bored pile foundation in the field with dimension variations of 0,85 meters, 0,9 meters and 0,95 meters using several research methods. This aims to determine the bearing capacity and settlement of bored piles based on SNI 1725: 2016 Bridge Loading. For this study, SNI 1725:2016 about bridge loading was used to determine loading on the bridge. While for calculation analysis, methods by Meyerhof (1956) and Reese and Wright (1977) would be used for determining the bearing capacity of single and group piles. Lastly, the settlement value would be determined using equation by Vesic (1977) and also verified by Finite Element Method of Plaxis 3D Software The results of the structural loading analysis based on SNI 1725:2016 Bridge Loading obtained the value of P = 35126,994 kN, Tx = 11387,697 kN, Ty = 2878,640 kN, Mx = 31669,403 kN/m, My = 16272,106 kN/m. Bearing capacity of single bored pile for existing dimension of Meyerhof (1956) method is 488,88 T and Reese and Wright (1977) method is 327,207 T. Elastic settlement on single pile for Meyerhoff (1956) method equation is 6,1 mm and Reese and Wright (1977) method is 4,02 mm. for plaxis 3D v20 results from Meyerhof (1956) method is 11,03 mm and from Reese and Wright (1977) method is 11,27 mm. for the capacity of a single pile at various dimensions (0,85 m, 0,9 m, and 0,95 m), the meyerhof method (1956) amounted to 379,136 T, 418,403 T, and 447,182 T and the Reese and Wright method (1977) amounted to 269,268 T, 290,350 T, and 306,198 T, respectively. Single pile settlement using Vesic (1977) method for Meyerhof (1956) method is 4,1 mm, 4,7 mm, and 5,3 mm and from Reese and Wright method is 3 mm, 3,3 mm, and 3,6 mm. for the results from plaxis 3D v20 for Meyerhof Equation is 5.54 mm, 13.63 mm, and 15.17 mm and for Reese and Wright equation is 10.5 mm, 10.46 mm, and 10.27 mm.