DYNAMIC PROPERTIES OF FOUNDATION SUB SOILS AS STUDIED FROM DYNAMIC TRIAXIAL CELL TESTS - PART 1

THE AUTHORS STRESS THE IMPORTANCE OF KNOWING THE CHARACTERISTICS OF THE GROUND-STRUCTURE INTERACTION DURING VIBRATION, ESPECIALLY WHEN CALCULATING RESPONSES TO EARTHQUAKES FOR A STRUCTURAL DYNAMIC DESIGN. DYNAMIC PROPERTIES OF THE SOIL ARE LESS KNOWN THAN THOSE OF A STRUCTURE. ALTHOUGH SOME RESEARCH ON SOIL DYNAMICS WAS DONE, NOT ENOUGH IS KNOWN TO ENABLE THE APPLICATION OF DYNAMIC DESIGNING TO 'GROUND-STRUCTURE' SYSTEMS. IN ORDER TO STUDY THE ABOVE INTERACTION PROBLEMS, IT IS NECESSARY TO KNOWN THE YOUNG'S MODULUS, POISSON'S RATIO, SHEAR MODULUS, AND DAMPING CAPACITY OF SOIL. THIS REPORT, PART OF A SERIES OF STUDIES OF SOIL DYNAMICS, GIVES PERFORMANCE RESULTS FOR THE DYNAMIC CELL TEST, AND SOME TYPICAL EXAMPLES OF MEASUREMENTS. DETAILS ARE GIVEN OF THE APPARATUS USED IN THE TESTS.