Axial Bearing Capacity Analysis of Pile Foundation using Nakazawa Method

Laras Laila Lestari, Jaka Propika, Aisyah Dwi Puspasari

Abstract


Pile foundation serves to distribute all the loads in the building to the ground. There are several calculation methods for bearing capacity of pile foundation, one of them is Nakazawa method. Nakazawa method adapted from calculation used in Japan where it is relevant for soft soils. The aim of this research is to obtain axial bearing capacity of pile foundation that can withstand axial forces using Nakazawa method. The parameter that used for the calculation is modified or average N-value (). The analysis result shows the  value is smaller than N existing, indicate that Nakazawa tend to use weaker value of N blows. It means the calculation is considered softer type of soils than the existing ones.The value of point bearing capacity, Rp, assimilate to the pattern of N-SPT. The result value of friction bearing, Rf, in respect of depth shows the linear trending. Rf along the pile depends on the friction interaction between soil and structure. This phenomena influenced by the soil type. The value of cohession along the pile augment, means the ability of soils to stick to the pile/structure is also high. It explains why the value of friction bearing is bigger in respect of depth.

Keywords


Nakazawa method; Axial bearing capacity; N-SPT modified; Pile foundation

Full Text:

PDF

References


D. K. Fitriyah, J. Propika, L. L. Lestari, H. Istiono, D. Pertiwi, and R. Sekartadji, “Pile Foundation Analysis on High - Rise Building using Finite Element-Spring Method on Sandy Clay Soil,” IOP Conf. Ser. Mater. Sci. Eng., vol. 462, no. 1, 2019.

J. E. Bowles, “Foundation Analysis and Design International Fifth Edition,” 1997.

B. M. Das, Princliples of Foundation Engineering, vol. ?3. 2011.

T. Kanda et al., “New soil maps of Japan based on the comprehensive soil classification system of Japan - First approximation and its application to the world reference base for soil resources 2006,” Japan Agric. Res. Q., vol. 52, no. 4, pp. 285–292, 2018.

Y. Liang, L. Cao, and J. Liu, “Statistical Correlations between SPT N-Values and Soil Parameters: Part I: SPT N vs EPMT in Victoria Street Station Statistical Correlations between SPT N-Values and Soil Parameters,” Dep. Civ. Eng. Ryerson Univ., no. June, 2015.

T. R. Satrya et al., “Engineering Geological Mapping at Center of Surabaya Region by Developing Geo-Tomography Image Analysis,” Celeb. Int. Conf. Earth Sci., no. October 2015, 2014.

S. Sosrodarsono and K. Nakazawa, MEKANIKA TANAH & TEKNIK PONDASI. JAKARTA: PT. PRADNYA PRAMITA, 2000.




DOI: https://doi.org/10.31284/j.iptek.2020.v24i1.900

Refbacks

  • There are currently no refbacks.