Comparison of the Results of Load Test Done on Stone Columns and Rammed Aggregate Piers using Numerical Modelling

In this article jacked pile installation technology and its current processes, altering the base physical and mechanical characteristics are discussed. For the jacked pile static load test simulation Plax 3D software was selected, the opportunities and developments were described. Model building, materials, models, model geometry, finite elements, boundary conditions and assumptions adopted in addressing problems described in detail. Three different tasks formulated and load-settlement dependence a comparison of the results with the experiment given. Conclusions are formulated according to the modeling results. Šiame straipsnyje aptarta spaustinių polių įrengimo technologija ir ją taikant vykstantys procesai, keičiantys pagrindo fizines ir mechanines charakteristikas. Spaustinio polio bandymui statine apkrova modeliuoti pasirinktas PLAXIS 3D programinis paketas ir aprašytos jo galimybės bei raida. Detaliai nupasakotas modelio kūrimas, medžiagų modeliai, modelio geometrija, baigtiniai elementai, kraštinės sąlygos ir priimamos prielaidos sprendžiant problemą. Suformuluoti trys sprendžiami uždaviniai ir apkrovos bei nuosėdžio priklausomybe pateikiamas rezultatų palyginimas su eksperimentu. Atsižvelgiant į modeliavimo rezultatus suformuluotos išvados.

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RAPID LOAD TESTING OF STONE COLUMNS TO AID DESIGN OF FOUNDATIONS ON IMPROVED GROUND

Proceedings of International Structural Engineering and Construction ◽

10.14455/isec.res.2018.46 ◽

2018 ◽

Vol 5 (1) ◽

Author(s):

John Fahd Touma ◽

Salah Sadek ◽

Shadi Najjar

Keyword(s):

Static Load ◽

Ground Improvement ◽

Compressive Force ◽

Field Tests ◽

Site Investigation ◽

Shallow Foundations ◽

Load Test ◽

Stone Columns ◽

Load Testing ◽

Axial Compressive Force

Building Codes and best practice require load testing of embedded structural foundation elements to validate design and construction execution quality. This requirement is particularly challenging when associated with ground improvement schemes relying on granular reinforcing/stone columns. Stone columns present an economic solution for improving the bearing capacity of shallow foundations on soft soils. A novel impulse load test was developed and used to quantify the load-displacement response of shallow foundations supported on stone columns at a clay site. The device is referred to as the Rapid Plate Load Tester (RPLT) and is a modified version of the Axial Compressive Force Pulse test for deep foundations. In this paper, the comprehensive site investigation, stone columns construction, load testing procedure, and data analysis are described. Static and dynamic field tests were performed to target loads of 2000 kN and equivalent bearing pressures of 500kPa. The results obtained from the RPLT tests were used to derive equivalent static load settlement curves for footings on both the natural clay ground and improved ground and compared with the results obtained from the full-scale static load tests.

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The Experimental Design of Stone Columns' Modelling using Small-Scale Unit Cells: A Review

International Journal of Engineering & Technology ◽

10.14419/ijet.v7i3.32.18400 ◽

2018 ◽

Vol 7 (3.32) ◽

pp. 88

Author(s):

Bahaa A. Almaliki ◽

Mohamad R. Selamat

Keyword(s):

Experimental Design ◽

Load Test ◽

Stone Columns ◽

Stone Column ◽

Small Scale ◽

Clayey Soils ◽

Stone Size ◽

Scale Unit ◽

Unit Cells ◽

Cylindrical Tanks

This paper presents a review of the experimental design of the small-scale single stone column that adopts the unit cell concept. Materials and methods used in experiments along with their effects and implication have been appraised. The reviewed cases showed that clayey soils were often used to construct the host ground. Steel cylindrical tanks were used with diameters ranging from 15 to 60 cm and heights ranging from 20 to 120 cm. For such scale, the used stone size is 2 to 10 mm. Plates load test can be carried out on the entire tank or on the stone column. The load has been imposed at a constant settlement rate of 1 to 1.25 mm/min in order to simulate the stage immediately after construction. The review shows that remoulding and replacement have been often practised for the construction of the host ground and the stone column, respectively.

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Load Test Comparisons for Rammed Aggregate Piers and Pier Groups

Soil Improvement ◽

10.1061/40916(235)19 ◽

2007 ◽

Cited By ~ 6

Author(s):

Kord J. Wissmann ◽

David J. White ◽

Evert Lawton

Keyword(s):

Load Test ◽

Aggregate Piers

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Testing and Modelling of Concrete Pile Foundations

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.738.287 ◽

2017 ◽

Vol 738 ◽

pp. 287-297

Author(s):

Kamil Burkovič ◽

Martina Smirakova ◽

Pavlina Matečková

Keyword(s):

Reinforced Concrete ◽

Numerical Modelling ◽

Load Test ◽

Foundation Slab ◽

Concrete Piles ◽

Concrete Foundation ◽

Piled Raft ◽

Piled Raft Foundation ◽

Raft Foundation ◽

Concrete Pile

Foundation of building on concrete piles is often used when it is necessary to carry the load into larger depth as by common foundation. Bearing capacity of piles or piled raft foundation is wide area to research. This paper deals with experimental load test of concrete pile and with their numerical modelling. Several types of foundation construction were tested and two kinds will be presented and compared in this paper - reinforced concrete foundation slab and raft foundation (made of reinforced concrete foundation slab supported by drilled reinforced concrete pilot). These types of foundation constructions were constructed as models, in a reduced scale, approx. 1:10. The size had to be adjusted due to limited capacity of the testing equipment and financial reasons. Except measuring of the foundation behaviour, there was also carried out measurement of the adjacent terrain.The aim of this paper is to compare the behaviour of rigid slab and the piled raft. The measurement results will be then compared with the results of numerical modelling.

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