3-D Numerical Analysis of Consolidation Effect on Piled Raft Foundation in Bangkok Subsoil Condition

Watcharasawe, Kongpop; Kitiyodom, Pastsakorn; Jongpradist, Pornkasem

doi:10.21660/2017.31.6529

Cited by 8 publications

(5 citation statements)

References 13 publications

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“…Also, the load-sharing ratio increases with increases the pile spacing. The maximum bending moment and shear force are noted to be less in piled-raft foundation than that of raft foundation or pile group analysis [5][6][7][8][9]. The present study is a case study focused on reanalyzed a constructed raft and piles to calculate the allowable carrying capacity of piles and apply SAFE 12 software to analyze the system as piled-raft instead of analysis the system as pile group.…”

Section: Introductionmentioning

confidence: 93%

Numerical Evaluation of Foundation of Digester Tank of Sewage Treatment Plant

Karkush

Aljorany

2019

Civ Eng J

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In the present study the foundation of digester tank, main part of sewage treatment plant, is reanalyzed analytically and numerically to check the adequacy of such foundation to support superstructure loading. The foundation of digester tank consists of raft foundation and bored piles. The diameter of raft is 33 m and thickness of 1 m, while the piles are bored type of diameter 0.6 m and length 15 m. After testing eleven working piles, it is found that three piles cannot support a load of 1.5 times the working load (1305 kN) safely or in other words the factor of safety of these failed piles is less than 1.5. The results of filed pile tests are reanalyzed using two well-known methods, Davisson’s method and Brinch-Hansen method to check the ultimate carrying capacity of tested piles. Also, this paper includes analysis of previous soil investigation report and conducting additional soil investigation by drilling three boreholes to secure the soil parameters used in the analytical and numerical analysis of digester tank foundation. SAFE 12 software is used to analysis the foundation of structure as piled-raft instead of pile group to interest from the interaction between soil and raft foundation. The results of analysis showed that the piles failed in the tests can support its share of the superstructure load by a factor of safety 1.8 and the piles success in the field tests can support its share of the superstructure load by a factor of safety not less than 2.86. Also, the settlement under structure will be less than 100 mm, where using piled-raft analysis reduces the settlement to be within allowable limits.

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Section: Introductionmentioning

confidence: 93%

Numerical Evaluation of Foundation of Digester Tank of Sewage Treatment Plant

Karkush

Aljorany

2019

Civ Eng J

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“…In order to reach the competent argillite layer, depth of the piles varies from 18.0 m to 21.0 m depending on the location on the foundation plan. This system is similar to piled raft foundations used in other countries, for reaching competent subsoil layers [7], [8]. Numbering of the foundation piles, as well as floor plan axes used in this study are included in Fig.…”

Section: Structure and Foundationmentioning

confidence: 99%

Jack-Assisted Leveling Process of an Actual 17-Story Building

Correal¹,

Reyes²,

Echeverry³

et al. 2018

GEOMATE

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Foundation problems during building construction may cause important structural and nonstructural damage, and compromise the building serviceability. This paper presents a case study of a jackassisted leveling process implemented on a 17-story reinforced concrete building that suffered important differential settlements during its construction. It is the first time a leveling solution for just a group of piles is implemented, since previous studies considered intervening all foundation piles. The procedure consists on cutting a small slice of the piles in the unsettled side of the building, equivalent to the necessary descent for leveling the settlements in the opposite end, and lowering the unsettled part by a controlled maneuver with hydraulic jacks. Prior to its execution, a numerical model was developed for predicting the effectiveness of the descent maneuver indicating that the leveling process would correct the tilt of the building. The solution was successfully implemented and the building is now in service.

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“…Therefore, piles must be used as a foundation to support the weight of the high-rise building and to transfer that weight to firmer soil layers at a deeper level. A raft is usually used as a medium for conveying forces from the high-rise building to the piles [1][2][3][4][5][6][7]. Parameters describing the behavior of the raft, expressed as its moment and shear, are required to specify the reinforcing steel design, and they are commonly calculated using the plate on springs method, by simulating the raft as a thin plate element and the piles as springs, with the analysis undertaken using a general structural analysis computer program [8].…”

Section: Introductionmentioning

confidence: 99%

“…proper design is essential, with safe and costeffective application. Pile simulation research is ongoing, with current studies including physical test experiments [15,16] or finite element methods [7,17]. The objective of this study was to investigate the loading behavior of piles in sand based on physical modeling and the effects of various factors influencing the loading behavior of piles using the finite element method (FEM).…”

Section: Introductionmentioning

confidence: 99%

Load-Displacement Behavior of Single Pile in Sand Using Physical Model Test and Finite Element Method

Amornfa¹

2023

GEOMATE

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Load-displacement behavior of a pile is one of the key parameters in the foundation design of a high-rise building. This research studied the relationship between the load and displacement of a pile in sand using a physical model test and the finite element method (FEM). Five types of sandy soil, including Bangkok sandy soil, were tested using the physical model test with a pile 1 cm in diameter and 30 cm in penetrated length. The results showed that the relationship between the load and actual pile displacements in all soil types was nonlinear with an elastoplastic-strain hardening pattern. This relationship was expressed using a polynomial function for a displacement in the range 0-20 percent of the pile diameter. For easy use, the relationship can be considered a linear function only in the first stage of displacement (0-10 percent of pile diameter), confirming that linear pile spring stiffness can be reasonably used for the design of the foundation. In addition, the finite element method was used to investigate the effect of various factors on pile spring stiffness. The results showed that pile spring stiffness depended on diameter, length, and modulus of the pile and on the soil modulus. In natural soil, the modulus of soil was related to the soil strength and the pile spring stiffness also depended on the soil strength.

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3-D Numerical Analysis of Consolidation Effect on Piled Raft Foundation in Bangkok Subsoil Condition

Cited by 8 publications

References 13 publications

Numerical Evaluation of Foundation of Digester Tank of Sewage Treatment Plant

Numerical Evaluation of Foundation of Digester Tank of Sewage Treatment Plant

Jack-Assisted Leveling Process of an Actual 17-Story Building

Load-Displacement Behavior of Single Pile in Sand Using Physical Model Test and Finite Element Method

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