SOME TEMPERATURE EFFECTS ON SOIL COMPRESSIBILITY AND PORE WATER PRESSURE

DATA ARE PRESENTED TO SHOW THAT HEATING A COHESIVE SOIL INCREASES ITS COMPRESSIBILITY AT LOW LEVELS OF APPLIED STRESS AND ALSO PRODUCES VOLUME DECREASES. THE VOLUME CHANGES ASSOCIATED WITH TEMPERATURE INCREASES ARE SHOWN TO BE RELATED TO THE DEGREE OF OVER-CONSOLIDATION OF THE SOIL, DECREASING AS THE OVERCONSOLIDATION RATIO INCREASES. COOLING THE SOIL ALTERS ITS STRESS-STRAIN CHARACTERISTICS AND CAUSES IT TO BEHAVE AS IF IT WERE OVER-CONSOLIDATED. SECONDARY COMPRESSION RATES ARE SHOWN TO BE AFFECTED ONLY SLIGHTLY BY HEATING AND SIGNIFICANTLY BY COOLING. TEMPERATURE-INDUCED PORE WATER PRESSURES IN UNDRAINED TRIAXIAL SPECIMENS ARE SHOWN TO BE RELATED TO THE STRESS HISTORY OF THE SPECIMEN AND, FOR SOME MATERIALS, PREDICTABLE FROM THE RESULTS OF TRIAXIAL CONSOLIDATION TESTS. /AUTHOR/