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Laboratory experimental analysis on encapsulated stone column

Tandel Y. K., Solanki C. H., Desai A. K.

Archives of Civil Engineering

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2013

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Vol. 59, nr 3

359--379

EN

The application of stone column technique for improvement of soft soils has attracted a considerable attention during the last decade. However, in a very soft soil, the stone columns undergo excessive bulging, because of very low lateral confinement pressure provided by the surrounding soil. The performance of stone column can be improved by the encapsulation of stone column by geosynthetic, which acts to provide additional confinement to columns, preventing excessive bulging and column failure. In the present study, a detailed experimental study on behavior of single column is carried out by varying parameters like diameter of the stone column, length of stone column, length of geosynthetic encapsulation and stiffness of encapsulation material. In addition, finite-element analyses have been performed to access the radial deformation of stone column. The results indicate a remarkable increase in load carrying capacity due to encapsulation. The load carrying capacity of column depends very much upon the diameter of the stone column and stiffness of encapsulation material. The results show that partial encapsulation over top half of the column and fully encapsulated floating column of half the length of clay bed thickness give lower load carrying capacity than fully encapsulated end bearing column. In addition, radial deformation of stone column decreases with increasing stiffness of encapsulation material.

2

Influence of Pressure and Load on Radial Deformation of the Tyre

Olszewski Z., Waluś K. J.

Machine Dynamics Research

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2012

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Vol. 36, No. 3

65-71

EN

Adhesive tire-road interaction significantly depends on the tyre operational parameters and directly affects safety of the vehicle. Phenomena occurring in the area of contact between the ground and tyre are crucial to maintain directional stability and the ability to transfer driving forces. Changes in pressure and tire load affects the geometry of the contact area and lead to changes in the coefficient of adhesion. This paper presents results of research and discusses effect of pressure and vehicle axle radial load on the geometric features of the contact zone.

3

Badania odkształceń dynamicznych rolniczych opon napędowych na glebie lekkiej

Błaszkiewicz Z.

Problemy Inżynierii Rolniczej

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2008

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R. 16, nr 4

37-44

PL

Przedstawiono wyniki polowych badań dynamicznych odkształceń promieniowych i bocznych opon napędowych 13,6-36, 16,9-34 i 23,1-26 w zależności od dodatniego poślizgu kół napędowych. Pomiary przeprowadzono w ruchu kół za pomocą specjalnego oprzyrządowania na spulchnionej glebie piaszczystej. Wykazano, że każdą z badanych opon napędowych charakteryzuje inna zależność tych odkształceń od poślizgu koła. Opracowane równania pozwalają na określenie odkształceń promieniowych na podstawie odkształceń bocznych opon.

EN

Paper presents the results of field investigations on radial and lateral deformations in the 13.6-36; 16.9-34 and 23.1-26 driving tyres, depending on the slip of driving wheels. The measurements were taken with the use of special instruments during wheel motion on loosened sandy soil. It was found that each of the tested driving tyres was characterized by different dependence of investigated deformations on the wheel slip. The equations were developed which enable to determine radial deformations of the tyres on the basis of their lateral deformations.

4

Porównanie wskaźników odkształcenia promieniowego przy wyciskaniu przeciwbieżnym obliczanych różnymi wzorami

Woźniak H.

Obróbka Plastyczna Metali

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1998

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T. 9, nr 1

33-38

PL

Przeprowadzono analizę uproszczonego wzoru Siebela i Fangmeiera oraz Kuehnego. Zbadano skutki stosowania ww. wzorów zamiast wzoru podstawowego wyprowadzonego również przez Siebla i Fangmeiera, na przykładzie obliczeń jednostkowych nacisków wyciskania przeciwbieżnego.

EN

The simplified Siebel and Fangmeier formula and simplified Kuehne formula have been analysed. The effects of the application of the above formulas instead of the basic one, also derived by Siebel and Fangmeier, have been investigated on the example of calculation of backward extrusion specific pressures.