A 3D FEM analysis on the performance of disconnected piled raft foundation

Hor, Boramy; Song, MyungJun; Jung, Min-Hyung; Song, Young-Hun; Park, Yung-Ho

doi:10.3208/jgssp.kor-21

Cited by 10 publications

(3 citation statements)

References 4 publications

(2 reference statements)

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“…Numerical investigations conducted by various scholars [30,31] using 3D element analysis have explored Disconnected Piled Raft (DPR) interactions and Load Transfer Loads (LTP) compared to piles connected to rafts. These studies found that the DPR system can effectively minimize settlement and transfer loads to deeper soil layers, thereby influencing the soil-bearing capacity.…”

Section: Resultsmentioning

confidence: 99%

Effectiveness of Micro-Pile Installation Configuration for Increasing the Ultimate Shallow Foundation Bearing Capacity on Soft Clay Soil

2024

GEOMATE

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Soft clay soil is known for low bearing capacity and is prone to soil collapse under shallow foundations through Local Shear Failure. An approach to enhance the load-bearing capacity of such soil is by adopting micro-piles as reinforcement. This study aims to determine the effectiveness of micro piles in strengthening shallow foundations on soft clay soil through laboratory-scale testing. The soft soil used comes from kaolin clay characterized by a cohesion (cu) of 20.692 kN/m 2 and water content (wc) of 58.631%. These properties guided the crafting of test specimens, formed with a diameter (ds) of 0.33m and a height (Hs) of 0.185m. Micropiles were constructed from bamboo with varying numbers (n = 4, 9, 16, 25), lengths (L1= 1.33B, L2= 1.73B, L3= 2.13B), and diameters (d1= 0.03B, d2 = 0.04B, d3= 0.07B). The shallow foundation model with a square shape of BxB (where B=0.075 m), incorporated diverse configurations for the installation of micro-piles (K1, K2, K3). The results showed that more micro-piles (n) led to a higher bearing capacity ratio at a 0.1B reduction (Rqult-mp). The most significant enhancements occurred with the longest micro-piles (L3 = 2.13B), the highest number (n4 = 25), and a diameter of 0.04 B. Additionally, configurations including micro-piles installed beneath and extending up to the foundation's edge (K1 and K2) exhibited significant enhancement in Rq0.1B for identical micro-piles numbers (n). The installation of micro-piles beyond the foundation perimeter did not yield substantial increases in Rq0.1B and, therefore, is not recommended.

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Section: Resultsmentioning

confidence: 99%

Effectiveness of Micro-Pile Installation Configuration for Increasing the Ultimate Shallow Foundation Bearing Capacity on Soft Clay Soil

2024

GEOMATE

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“…Soil is a complicated material that acts differently when it is first loaded, unloaded, and reloaded (Banerjee et al, 2020;Hor al., 2016). It acts in a nonlinear way well before it breaks, and its stiffness changes with stress.…”

Section: Soil Model and Materials Propertiesmentioning

confidence: 99%

Numerical Study of Piled Raft Foundation in Non-Homogeneous Soil Using Finite Element Method

Sami,

Al-Ameri

2023

jcoeng

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This paper analyzes a piled-raft foundation on non-homogeneous soils with variable layer depth percentages. The present work aims to perform a three-dimensional finite element analysis of a piled-raft foundation subjected to vertical load using the PLAXIS 3D software. Parametric analysis was carried out to determine the effect of soil type and initial layer thickness. The parametric study showed that increasing the relative density from 30 % to 80 % of the upper sand layer and the thickness of the first layer has led to an increase in the ultimate load and a decrease in the settlement of piled raft foundations for the cases of sand over weak soil. In clay over weak soil, the ultimate load of the piled raft foundation was increased, and the settlement decreased by increasing the clay cohesion of the upper layer from 20 kPa to 70 kPa. It was observed that the load shared by the raft was very effective when using dense sand in the upper layer. In the case of dense sand over stiff clay, the percent of load carried by the raft is (30-40) %. Although, for the case of stiff clay over soft clay, the load percentage was almost constant (16-20) %. While for other issues, the sharing load of raft foundation was close and had the same behavior, the load carried by raft is between (8-12) %.

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“…A parametric study conducted by using 'Plaxis' reveals that the disconnected piled raft (DPR) foundation is more efficient for soft soils. The system performed better for heavy structures [14].…”

Section: Introductionmentioning

confidence: 97%

The Appraisal of Hybrid Foundations on Loose Granular Soil of Western Saudi Arabia

Farooq

Shaath

2020

Proc. eng. technol. innov.

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Western Saudi Arabia is the most important geographic location for the Islamic world. Millions of pilgrims annually visit the region. To accommodate this huge number of pilgrims, various tall buildings are constructed, yet there is a need for many more. The demolition of old buildings is also in progress. The soil supporting of the foundations mostly comprises sand with varying relative density. Most of the buildings are supported by conventional foundations, which require deep excavation for low relative densities. The combinations of pile and raft or hybrid foundations have been effectively used in tall buildings around the globe. In this research, COMSOL Multiphysics FEM analysis has been adopted to investigate the performance of a hybrid foundations with different pile combinations supported on loose granular soil. The results reflect the effective utilization of the hybrid foundation on loose sand. The arrangement of piles in the foundation system can affect the economy and safety of the structure.

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A 3D FEM analysis on the performance of disconnected piled raft foundation

Cited by 10 publications

References 4 publications

Effectiveness of Micro-Pile Installation Configuration for Increasing the Ultimate Shallow Foundation Bearing Capacity on Soft Clay Soil

Effectiveness of Micro-Pile Installation Configuration for Increasing the Ultimate Shallow Foundation Bearing Capacity on Soft Clay Soil

Numerical Study of Piled Raft Foundation in Non-Homogeneous Soil Using Finite Element Method

The Appraisal of Hybrid Foundations on Loose Granular Soil of Western Saudi Arabia

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