In Situ Strength of Rolled and Hydraulic Fill

TLDR: In this paper, it was shown that the in-situ strength of recently-compensated fill is anomalous due to in-place stress conditions, even though the soil is relatively stable.

Abstract: ROLLED AND HYDRAULIC FILL USUALLY HAVE ANISOTROPIC IN SITU STRENGTH CHARACTERISTICS. THE STRENGTHS ON HORIZONTAL AND VERTICAL PLANES IN AN ANISOTROPIC SOIL MAY BE EVALUATED BY VANE SHEAR TESTS WITH VANES OF DIFFERENT SHAPES. TESTS SHOW THAT THE IN SITU STRENGTH OF RECENTLY COMPACTED FILL IS ANISOTROPIC DUE TO IN-PLACE STRESS CONDITIONS, ALTHOUGH THE SOIL IS INTRINSICALLY ISOTROPIC. IN A 34-YEAR OLD EMBANKMENT, HOWEVER, THE IN SITU STRENGTH IS ISOTROPIC ALTHOUGH THE SOIL IS INTRINSICALLY ANISOTROPIC. THE IN SITU STRENGTH OF HYDRAULIC FILL IS ANISOTROPIC IN SUCH A WAY TO CORRESPND TO THE COEFFICIENT OF EARTH PRESSURE AT REST IN NORMALLY CONSOLIDATED SOIL. /AUTHOR/