Summary
This paper details mapping undertaken along a length of water-pipeline trench in Northamptonshire. A number of surface characteristics were mapped, geomorphological units derived and a classification made of the weathered state of the sampled materials. A brief comparison of the change of fundamental engineering properties with weathering grade was also undertaken. In this case study, geomorphological units predict between 65% and 79% of weathering profile variations but the relationships between weathering and geotechnical properties are indeterminate. It is suggested that whilst the geomorphological unit approach provides a best first estimation of the variation of the weathered state of materials, a larger proportion of the variability of geotechnical properties can be related to known variations in parent material.
Résumé
On décrit la cartographie entreprise le long de la tranchée d'un aqueduc dans le Northamptonshire. On a cartographié un certain nombre de caractéristiques de surface, les unités géomorphologiques en découlant, et classé les matériaux échantillonnés selon leur état d'altération. On a aussi entrepris une brève comparaison du changement des propriétés géotechniques en fonction de l'état d'altération. Dans l'exemple présenté, les unités géomorphologiques prédisent 65 à 79% des variations du profil d'altération mais les relations entre altération et propriétés géotechniques restent indeterminées. On suggère que l'approche par unité géomorphologique fournit une meilleure première approximation des variations de l'état d'altération des matériaux, tandis qu'on peut relier la plupart des variations de leurs propriétés géotechniques à celles connues dans les matériaux dont ils dérivent.
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Knott, P.A., Doornkamp, J.C. & Jones, R.H. The relationship between soils and geomorphologiacl mapping units—a case study from northamptonshire. Bulletin of the International Association of Engineering Geology 21, 186–193 (1980). https://doi.org/10.1007/BF02591560
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DOI: https://doi.org/10.1007/BF02591560