FEM modelling of a large piled raft for settlement control in weak rock

Chaudhary, Muhammad Tariq A.

doi:10.1016/j.engstruct.2007.02.001

Cited by 22 publications

(11 citation statements)

References 12 publications

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“…The interface given between the pile and soil are considered as tie contact to ensure the proper load transfer from pile to soil [11]. The boundary provided at the bottom is pinned and the lateral boundary is supported by roller.…”

Section: Finite Element Analysis Of Model Pilementioning

confidence: 99%

An Experimental and Numerical Study on Behaviour of Single Pile and Group of Piles in Layered Soils under Vertical Load

Deb¹,

Pal²

2016

IJERT

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The behaviour of single and group pile in multiple layered soils is studied herein. This paper describes a prototype test on model pile groups of configuration 1×1, 2×2, and 3×3, for embedment length to diameter ratios (L/D) of 5, 6, 7 and 8, and spacing 3 times of diameter, subjected to vertical loads are conducted on three layers of different soil type maintaining equal depth for each of the layers. The model piles used for the test are 250 mm in length with 25mm diameter and a test tank of dimension 700mm × 700mm × 600mm was used. This work also uses 3D finite element modelling on ABAQUS to analyse the effect of soil properties, pile length-to-diameter ratio and timedependent load-settlement behaviour on the capacity of a pile. Experimental investigations are made to relate the loadsettlement characteristics of different pile configuration with their respective length-to-diameter ratio, ultimate load with respect to their length to diameter ratio, load improvement ratio with number of pile and efficiency of pile group in each pile configuration. The test results indicate that pile capacity increases with the increase of number of pile and length-todiameter ratios and load improvement ratio increases with increase of number of piles. It is perceived that 3×3 group piles have almost 5-8 times and 2×2 group piles have almost 2-3 times greater load carrying capacity than the single piles. The numerical analyses i.e. finite element analyses (FEA) describe the variation of stress, strain and stain energy with respect to time and demonstrate the variation of pile-soil stress ratio with different embedded length.

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Section: Finite Element Analysis Of Model Pilementioning

confidence: 99%

An Experimental and Numerical Study on Behaviour of Single Pile and Group of Piles in Layered Soils under Vertical Load

Deb¹,

Pal²

2016

IJERT

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“…It is observed that most of the recent literatures [9][10][11][12][13][14][15] concentrated on the study of piled raft foundations under vertical loads only. Chaudhary [16] investigated the effectiveness of pile foundation in reducing 2 ISRN Civil Engineering settlement by comparing the results of piled raft foundation and the raft foundation alone. The effect of the superstructure is not considered in these piled raft studies.…”

Section: Background Of the Problemmentioning

confidence: 99%

Effect of Dynamic Soil-Structure Interaction on Raft of Piled Raft Foundation of Chimneys

Jayalekshmi

Jisha

Shivashankar

et al. 2014

ISRN Civil Engineering

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This paper presents numerical analysis of soil-structure-interaction (SSI) of tall reinforced concrete chimneys with piled raft foundation subjected to El Centro ground motion (1940) using finite element method. Seismic analysis in time domain was performed on the basis of direct method of SSI on the three-dimensional SSI system. The chimney, foundation, and soil were assumed to be linearly elastic in the analysis. The stress resultants and settlement of raft of piled raft foundation were evaluated under different soil properties and different geometrical features of raft and chimney. Soil properties were selected based on the shear wave velocity corresponding to sand in the loose to dense range. Chimneys with different elevations of 100 m, 200 m, and 400 m were taken with a ratio of height to base diameter of chimney of 17. Raft of different thickness was considered to evaluate the effect of stiffness of foundation. Results were analysed to assess the significance of characteristic of the ground motion. It is found that the response in the raft depends on the different parameters of chimney, foundation, and soil. It is also found that the higher modes of SSI system are significant in determining the response in the raft.

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“…Since the proposal of the concept of pile-raft foundation by Davis and Poulos [4] (1972), scholars both at home and abroad have been performing increasingly more studies over the pileraft foundations, which are extensively used in foundation treatment of high-rise buildings [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Load Transfer Law of Rigid Pile-raft Composite Foundations

Chen¹,

Li²

2017

MMC_C

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The rigid pile-raft composite foundations are adopted for the test section of the subgrade of Changzhutan Intercity Railway according to the design concept of settlement control. The author performs long-time observation towards the bearing characteristics of rigid piles, stress distribution of soil-between-piles, stress of rafts, deformation, etc. during construction, so as to explore its settlement control mechanism and bearing characteristics; and obtains some objective data as well. The author also analyzes the bearing characteristics of composite foundations, lateral distribution of the stress of soil-between-piles along subgrade, deformation characteristics under the stress of rafts and the change rule of stress of soil-between-piles over time under the effect of embankment load, and discusses the load transfer law of rigid pile-raft composite foundations, providing the test basis for further theoretical study and design optimization for rigid pile-raft composite foundations.

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FEM modelling of a large piled raft for settlement control in weak rock

Cited by 22 publications

References 12 publications

An Experimental and Numerical Study on Behaviour of Single Pile and Group of Piles in Layered Soils under Vertical Load

An Experimental and Numerical Study on Behaviour of Single Pile and Group of Piles in Layered Soils under Vertical Load

Effect of Dynamic Soil-Structure Interaction on Raft of Piled Raft Foundation of Chimneys

Experimental Study on Load Transfer Law of Rigid Pile-raft Composite Foundations

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