Effect of Rate of Strain on the Strength of Compacted Soil

Abstract

THE RESULTS OF A LABORATORY INVESTIGATION ARE REPORTED OF THE EFFECTS OF RATE OF STRAIN ON THE STRENGTH OF REMOLDED SOIL. TWO SOILS WERE SELECTED FOR PURPOSES OF THIS STUDY: (1) A CLAY DERIVED FROM LIMESTONE AND PEDOLOGICALLY CLASSIFIED AS FREDERICK, AND (2) A GLACIAL SILTY CLAY, PEDOLOGICALLY CLASSIFIED AS CROSBY, B HORIZON. THESE SOILS WERE SELECTED PRIMARILY ON THE BASIS OF THEIR DIFFERENCE IN PLASTICITY. RATE OF STRAIN WAS CONSIDERED THE MOST IMPORTANT VARIABLE AND IT WAS STUDIED FROM 0.55 IN./MIN. TO 1,780 IN./MIN. THE FACTORS OF MOISTURE CONTENT AND DRY DENSITY WERE ALSO OF PRIME IMPORTANCE. CONSEQUENTLY, THREE COMPACTIVE EFFORTS WERE USED AND SPECIMENS WERE MOLDED AND TESTED ON BOTH SIDES OF THE OPTIMUM MOISTURE CONTENT OF EACH COMPACTIVE EFFORT. THE UNCONFINED COMPRESSIVE STRENGTH TEST WAS USED AS A STRENGTH CRITERION AND THE EFFECT OF THE AFOREMENTIONED VARIABLES UPON THE ULTIMATE STRENGTH AND MODULUS OF DEFORMATION OF THE SAMPLES, AS DETERMINED BY THIS TEST, ARE REPORTED. /AUTHOR/