Mercury intrusion and permeability of Louiseville clay

Several theories have been proposed to correlate the permeability (hydraulic conductivity) with the pore-size distribution of soils, and it seemed interesting to determine if these theories could be applied to natural clays. For this purpose permeability and mercury-intrusion porosimetry tests were performed on a Champlain Sea clay for both intact and remoulded conditions after compression of the specimens to strains varying from 0 to 42%. The results show that for either intact or remoulded soil conditions, there is a relationship between the pore-size parameters and the permeability of the clay. However, there is no unique relationship for both intact and remoulded clays and for the silt and clay considered in previous studies. Consequently, mercury-intrusion porosimetry alone cannot be usepto evaluate the permeability of soils in general. :. Plusieurs thkories ont CtC proposCes pour corrCler la permiabilite (conductivitk hydraulique) avec la distribution des grosseurs de pore des sols, et il a semblC intiressant de verifier si ces theories pourraient 2tre-appliquees aux argiles naturelles. A cette fin, des essais de permCabilitC et de porosimCtrie a intrusion de mercure okt CtC rCalisCs sur l'argile de la mer Champlain dans des conditions tant intactes que remanikes apris la compression des specimens a des dCformations variant de 0 a 42%. Les rCsultats demontrent que pour des conditions soit intactes ou remaniCes, il existe une relation entre les paramitres de grosseur de pore et la permCabilitC de l'argile. Cependant, il n'existe pas de relation unique pour les argiles tant intactes que remaniCes, et pour le limon et l'argile CtudiCs antkrieurement. En consCquence, la porosimCtrie a intrusion de mercure ne peut pas a elle seule &tre utilisCe pour Cvaluer la permCabilitC des sols en general. Mots clds : permCabilitC, argile, porosimCtrie a intrusion de mercure, structure. [Traduit par la rCdaction]

[1]  Gérard Ballivy,et al.  Mineralogy, chemistry, and physical properties interrelationships of some sensitive clays from Eastern Canada , 1984 .

[2]  R. C. Joshi,et al.  Change in pore size distribution due to consolidation of clays , 1989 .

[3]  Sidney Diamond,et al.  Pore Size Distributions in Clays , 1970 .

[4]  Pierre Delage,et al.  Use of the Cryoscan apparatus for observation of freeze-fractured planes of a sensitive Quebec clay in scanning electron microscopy , 1982 .

[5]  T. J. Marshall A RELATION BETWEEN PERMEABILITY AND SIZE DISTRIBUTION OF PORES , 1958 .

[6]  S. Leroueil,et al.  The permeability of natural soft clays. Part II: Permeability characteristics: Reply , 1983 .

[7]  S. Leroueil,et al.  Permeability anisotropy of natural clays as a function of strain , 1990 .

[8]  T. C. Kenney,et al.  Permeability of compacted granular materials , 1984 .

[9]  P. Carman,et al.  Flow of gases through porous media , 1956 .

[10]  Harold W. Olsen,et al.  HYDRAULIC FLOW THROUGH SATURATED CLAYS , 1960 .

[11]  Pierre Delage,et al.  Study of the structure of a sensitive Champlain clay and of its evolution during consolidation , 1984 .

[12]  R M Quigley,et al.  THE FABRIC OF ANISOTROPICALLY CONSOLIDATED SENSITIVE MARINE CLAY , 1966 .

[13]  A. G. Loudon,et al.  The Computation of Permeability from Simple Soil Tests , 1952 .

[14]  S. Leroueil,et al.  The permeability of natural soft clays. Part I: Methods of laboratory measurement , 1983 .

[15]  C. H. Juang,et al.  A probabilistic permeability model and the pore size density function , 1986 .

[16]  E. C. Childs,et al.  The permeability of porous materials , 1950, Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences.

[17]  A. G. Altschaeffl,et al.  Pore Distribution and Permeability of Silty Clays , 1979 .