STUDY OF COMBINED PILE RAFT FOUNDATION ON THE SOIL OF CHAKUPAT AREA
Date
2023-04
Journal Title
Journal ISSN
Volume Title
Publisher
IOE Pulchowk Campus
Abstract
Traditional foundations cannot support a structure on weak soil or heavily settling soil. For
the purpose of controlling settlement, pile raft foundations are used, with the raft part
providing additional capacity at ultimate loading while the piles provide the majority of
stiffness under serviceability loads. The utilisation of pile raft foundations in the Chakupat
area which lies in the Kathmandu Valley is the subject of this research. The Kathmandu
Valley is located in an earthquake-prone area. After the 2015 earthquake, it is suggested to
implement a more solid and appropriate building strategy. The ideal alternative for the
construction is a piling raft foundation. As more and more tall structures are constructed in
Kathmandu, the pile raft foundation has a good chance of success in the valley of
Kathmandu.
This research explains the idea behind using piles to reduce settlement for raft foundations as
well as how pile rafts behave in the soil of Chakupath area. Model tests using the ideas of an
embedded pile and a volumetric pile are carried out and compared.This study shows the
percentage of weight carried by piles in the CPRF (Combined pile raft foundation) falls as the
number of piles is reduced, and increases as pile length is raised. The findings of the model
were compared with other papers as well as with analytical calculations for confirmations. A
foundation with raft thickness of 0.6 m, pile length of 15 m, diameter of 1 m, and spacing of
4 m is the most suited in Chakupat Area when taking into consideration the examination of
the soil structure, settlement, economy, and load sharing. The results show that the CPRF
model has a bearing capacity of 573969.62kN, a factor of safety of 4.42, and a stiffness of
433886.01 kN/m.
The estimated cost for the selected model was NRs. 76109910.25. The study concluded that
CPRF was a feasible foundation for the soil of the Chakupat area, and the proposed model
was safe for construction. The findings can provide valuable information for future
construction projects in the area, and the cost estimation can aid in budget planning.
Description
Kathmandu Valley, located in the central part of Nepal, is a unique geological feature
formed by the convergence of two major tectonic plates: the Indian Plate and the
Eurasian Plate. The valley is a graben, which means that it is a depressed block of
land that is surrounded by parallel faults
Keywords
Kathmandu Valley, Pile raft foundation