By Ruud J. Schotting, Hans C.J. van Duijn, Arnold Verruijt
This publication comprises an outline of the main appropriate clinical contributions of Gerard de Josselin de Jong to the improvement of either Soil Mechanics and delivery in Porous Media. the amount includes a variety of papers via de Josselin de Jong as they have been released within the overseas medical literature. additionally, a few unpublished, yet hugely appropriate paintings has been integrated. many of the papers through de Josselin de Jong are all in favour of matters regarding soil mechanics. this isn't impressive, given that he labored at Delft Soil Mechanics Laboratory and given the character of his chair at Delft collage of expertise. yet sometimes he made an expedition to the realm of move and shipping in porous media. It characterizes his ingenuity that the majority of those tours resulted in papers which are now classics within the box. The editors have selected to divide his key guides right into a team dedicated to soil mechanics and a gaggle dedicated to movement and shipping in porous media. the chosen papers have been released within the interval 1950-1990. They essentially display the advance of principles and the profound contributions of de Josselin de Jong. every one paper is a jewel by itself. He has a very unique method of reasoning and he illustrated tricky ideas and mechanisms simply by his well-known hand-made drawings. specifically younger scientists will get pleasure from studying those papers simply because very important components of modern-day porous media learn locate their roots in them, and since many questions raised by means of de Josselin de Jong are nonetheless open and topic to present investigations.
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This publication comprises an summary of the main suitable medical contributions of Gerard de Josselin de Jong to the advance of either Soil Mechanics and delivery in Porous Media. the amount contains a range of papers via de Josselin de Jong as they have been released within the overseas clinical literature.
Extra info for Soil Mechanics and Transport in Porous Media: Selected Works of G. de Josselin de Jong (Theory and Applications of Transport in Porous Media)
X cos a. ~ sin a. x cos a. ~ sin a. , .. -a, _ ... p this reduces to V" . J<+V,,~ = O (IS) This is the relation for volume incompressibility, a property known to be exhibited by the double sliding, free rotating model. ,,) cos 2++( - Y,... ,,+ V•. 21). CONSTI T UTIVE INEQUALITIES In the previous sections flow rules have been derived that describe the behaviour of the double sliding, free rotating model. In order t o compute a velocity fie ld from boundary conditions, it is sufficient to know two relations concerning V" and V~ or their derivatives in every point.
2, remained virtually the same during the entire counter-clockwise rotation in every test, while a clockwise rotation produced chains positioned more or less ve rtically. The magnitude and direction of the contact forces could be evaluated by measuring the geometry of the isochromaties in the vicinity of the contact points. In order to perform this evaluation, preliminary calibration tests were required. Using these results the calculation of forces was executed for the entire inner region OABCD (see Fig.
De Josselin de Jong 31 o FIG. 2. Photoe last icity pi cture of the granu lar assembly. X, --X,'m' ,, , ,, '~ S ,, ,m, X , X, FIG. S. Component$ of surface traclion vector in discrete assembly. 32 Soil Mechanics and Transport in Porous Media Mechanical model of granular material 341 During each test, several photographs of the model for different stages of deformation were taken. Owing to the initial pre-s tressing of the discs by the loading plate the interaction of the particles produced sufficiently high stresses within the discs during deformation to procure a well-developed isochromatic pattern observable in circularly polarized light.
Soil Mechanics and Transport in Porous Media: Selected Works of G. de Josselin de Jong (Theory and Applications of Transport in Porous Media) by Ruud J. Schotting, Hans C.J. van Duijn, Arnold Verruijt
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