Authors :
Md. Saddam Hossain; Rima Parvin
Volume/Issue :
Volume 7 - 2022, Issue 10 - October
Google Scholar :
https://bit.ly/3IIfn9N
Scribd :
https://bit.ly/3rKGcUw
DOI :
https://doi.org/10.5281/zenodo.7179661
Abstract :
Estimation of Pile capacity has been one of the
major challenging issues for geotechnical engineers in
Bangladesh. Although various analytical and empirical
methods and codes of practices are available to estimate
the axial capacity of piles, the estimation has to be
supported by pile load test results. However, in practice,
being a costly, time-consuming, and risky approach, the
number of pile load tests specified by code of practices is
often truncated in many projects. Besides, a rigorous
understanding of soil mechanics, local geology, and
experiences are needed for the efficacious design of piles.
This study focuses on estimation of load capacity and soil
settlement for piles using the numerical modeling. A
finite element based software, PLAXIS-3D, has been
used for modelling of piles, to simulate pile load test for
piles in this study. Four piles, having various dimensions
and located at different parts of the country, are
modelled to estimate load capacities. Those piles
capacities are also estimated using different static and
dynamic methods to validate the estimated pile capacities
using PLAXIS model. For simplicity, for the shake of
general practitioners, soils and concrete piles are
modeled using Mohr-Coulomb, and Linear-elastic
material models. The axial load capacity of the piles are
estimated by different commonly practiced methods to
determine pile capacity in Bangladesh (α or total stress
method, β or effective stress method, λ or semi-empirical
method, and BNBC 2020, based on SPT N value). Shear
strength parameters of soils beneath and surrounding
the pile are estimated based on empirical correlations
based on SPT N value. Then, pile load tests are carried
out for those Four piles to corroborate the load capacity
and settlement values estimated by numerical modeling
and other methods. The study shows that results from
numerical modeling are agreeable with pile load test
results and other commonly used methods. Therefore,
numerical modeling of piles, which is easy to
accommodate, could help the practicing engineers to
design piles confidently and cost-effectively because the
load-settlement behavior of all piles of the projects can
be simulated using the numerical model. It could also
decrease the number of pile load tests required for large
projects and thus reduce the cost of the foundation.
Keywords :
Pile capacity, Pile load test, Numerical modelling, Mohr-Coulomb, Linear-elastic.
Estimation of Pile capacity has been one of the
major challenging issues for geotechnical engineers in
Bangladesh. Although various analytical and empirical
methods and codes of practices are available to estimate
the axial capacity of piles, the estimation has to be
supported by pile load test results. However, in practice,
being a costly, time-consuming, and risky approach, the
number of pile load tests specified by code of practices is
often truncated in many projects. Besides, a rigorous
understanding of soil mechanics, local geology, and
experiences are needed for the efficacious design of piles.
This study focuses on estimation of load capacity and soil
settlement for piles using the numerical modeling. A
finite element based software, PLAXIS-3D, has been
used for modelling of piles, to simulate pile load test for
piles in this study. Four piles, having various dimensions
and located at different parts of the country, are
modelled to estimate load capacities. Those piles
capacities are also estimated using different static and
dynamic methods to validate the estimated pile capacities
using PLAXIS model. For simplicity, for the shake of
general practitioners, soils and concrete piles are
modeled using Mohr-Coulomb, and Linear-elastic
material models. The axial load capacity of the piles are
estimated by different commonly practiced methods to
determine pile capacity in Bangladesh (α or total stress
method, β or effective stress method, λ or semi-empirical
method, and BNBC 2020, based on SPT N value). Shear
strength parameters of soils beneath and surrounding
the pile are estimated based on empirical correlations
based on SPT N value. Then, pile load tests are carried
out for those Four piles to corroborate the load capacity
and settlement values estimated by numerical modeling
and other methods. The study shows that results from
numerical modeling are agreeable with pile load test
results and other commonly used methods. Therefore,
numerical modeling of piles, which is easy to
accommodate, could help the practicing engineers to
design piles confidently and cost-effectively because the
load-settlement behavior of all piles of the projects can
be simulated using the numerical model. It could also
decrease the number of pile load tests required for large
projects and thus reduce the cost of the foundation.
Keywords :
Pile capacity, Pile load test, Numerical modelling, Mohr-Coulomb, Linear-elastic.
