Three-dimensional analysis of a loamy-clay soil using pore and solid chord distributions

Les distributions de cordes dans des milieux poreux modeles sont presentees. Nous avons analyse la repartition des phases solide et poreuse d'un echantillon de sol par les distributions de cordes. Des coupes seriees espacees de 100 μm ont ete realisees dans un echantillon de sol impregne de resine. Les images 2D de 160 coupes ont ete utilisees pour fabriquer une reconstruction 3D du systeme. Les images 2D initiales, l'image 3D reconstruite et des images 2D calculees a partir du milieu 3D ont ete caracterisees. Nous avons montre que la phase solide du sol etudie est repartie de facon homogene et isotrope dans le systeme et qu'une image 2D est suffisante pour caracteriser correctement le milieu. Pour des tailles de pores comprises entre 500 μm et 2 mm, les distributions de cordes de pores calculees pour les images 2D dans les trois directions orthogonales, et pour le milieu 3D sont Semblables. Une image 2D est donc suffisante pour etudier le reseau poreux a cette echelle. En revanche, pour les pores de taille superieure a 2 mm, nous avons montre qu'une seule image n'est pas suffisante pour le decrire, mais que huit images 2D au plus, espacees de 2 mm, le sont.

[1]  P. Stengel,et al.  UNE METHODE DE MESURE DE LA DENSITE APPARENTE DE PETITS AGGLOMERATS TERREUX - APPLICATION A L'ANALYSE DES SYSTEMES DE POROSITE DU SOL. , 1973 .

[2]  T. Ligthart,et al.  A method for the three-dimensional mapping of earthworm burrow systems , 1993 .

[3]  A. Jongerius,et al.  Electro-optical soil porosity investigation by means of Quantimet-B equipment , 1972 .

[4]  Richard Webster,et al.  The topology of pore structure in cracking clay soil I. The estimation of numerical density , 1988 .

[5]  Anthony Ringrose-Voase,et al.  One-dimensional image analysis of soil structure. I. Principles , 1990 .

[6]  Petter Deinboll Jenssen,et al.  SOIL COLUMN DESCRIPTIONS FROM X‐RAY COMPUTED TOMOGRAPHY DENSITY IMAGES , 1988 .

[7]  P. Levitz,et al.  Knudsen diffusion and excitation transfer in random porous media , 1993 .

[8]  Keith W. Jones,et al.  Synchrotron computed microtomography of porous media: Topology and transports. , 1994, Physical review letters.

[9]  P. Renault.  Theoretical studies of mercury intrusion in some networks: Testing the applicability of mercury intrusion in the size characterisation of the lacunar pore space of soil samples , 1988 .

[10]  J. T. Fredrich,et al.  Imaging the Pore Structure of Geomaterials , 1995, Science.

[11]  J. Fiès.  Analysis of Soil Textural Porosity Relative to Skeleton Particle Size, Using Mercury Porosimetry , 1992 .

[12]  A. Bruand,et al.  Effect of water content on the fabric of a soil material: an experimental approach. , 1987 .

[13]  Alan Boyde,et al.  The application of confocal microscopy to the study of stone weathering , 1993 .

[14]  P. Bullock,et al.  THE MEASUREMENT AND CHARACTERISATION OF VOIDS IN SOIL THIN SECTIONS BY IMAGE ANALYSIS. PART I. PRINCIPLES AND TECHNIQUES , 1977 .

[15]  T. Pape,et al.  A method to impregnate wet soil samples, producing high quality thin sections , 1974 .

[16]  C. J. Moran,et al.  A rapid method of analysis for soil macropore structure: II. Stereological model, statistical analysis, and interpretation. , 1990 .

[17]  E. Bisdom,et al.  The development of soil porosity in experimental sandy soils with clay admixtures as examined by quantimet 720 from besi and by other techniques , 1983 .

[18]  J. Bouma,et al.  The Function of Different Types of Macropores During Saturated Flow through Four Swelling Soil Horizons1 , 1977 .

[19]  R. T. DeHoff,et al.  Experimental determination of the topological properties of three‐dimensional microstructures , 1972 .

[20]  P. Levitz,et al.  Disordered porous solids : from chord distributions to small angle scattering , 1992 .

[21]  E. Fitzpatrick,et al.  THE IMPREGNATION OF WET PEAT FOR THE PRODUCTION OF THIN SECTIONS , 1978 .

[22]  M. Pagliai,et al.  Micromorphometric and micromorphological investigations of a clay loam soil in viticulture under zero and conventional tillage , 1983 .

[23]  C. Glasbey,et al.  Image analysis and three‐dimensional modelling of pores in soil aggregates , 1991 .

[25]  Pierre M. Adler,et al.  Flow in simulated porous media , 1990 .

[26]  G. P. Lawrence.  MEASUREMENT OF PORE SIZES IN FINE-TEXTURED SOILS: A REVIEW OF EXISTING TECHNIQUES , 1977 .