The effect of soil granülometry on preconsolidation pressure and soil memory

ABSTRACTPh. D. DissertationTHE EFFECT OF SOIL GRANULOMETRY ON PRECONSOLIDATIONPRESSURE AND SOIL MEMORYMustafa FENERDEPARTMENT OF GEOLOGICAL ENGINEERINGINSTITUTE OF NATURAL AND APPLIED SCIENCESÇUKUROVA UNIVERSITYSupervisor : Prof. Dr. Hasan ÇETİNYear: 2006, Pages 107Jury : Prof. Dr. Hasan ÇETİN (Head): Prof. Dr. Aziz ERTUNÇ (Member): Prof. Dr. Mustafa LAMAN (Member): Prof. Dr. Kamil KAYABALI (Member): Asst. Prof. Hakan GÜNEYLİ (Member)In this study, the effect of soil granulometry on preconsolidation pressure andsoil memory was investigated.For this purpose, we prepared 10 mixtures having different proportions ofsand and clay, placed the mixtures in molds, and to simulate overburden pressure,loads imposing 0,028 kgf/cm2 pressure on saturated mixtures were applied on themixtures for twelve months, thus forming artificial soil samples used in the study.In order to determine the preconsolidation pressure and soil memory of eachmixture, 15 undisturbed samples taken from each mold were placed in theconsolidation testing apparatus and 2,86 kgf/cm2 pressure were applied to eachsample for different time interval (e.g. 0, 1, 3, 6, 15 sec., etc.). These initial pressureswere recorded into the memory of soil through structure (fabric). Then, weconducted standard consolidation tests in order to determine the effective pressures(preconsolidation pressures) recorded in the samples. The same procedure wasapplied to the other mixtures and totally 126 tests were conducted. We alsodetermined the permeabilities of the mixtures to study the relationship between soilmemory and permeability.Using the Casagrande method, the preconsolidation pressure values weredetermined and the results were compared to examine the effect of soil granulometryon soil memory.Key Words: Soil Granulometry, Soil Memory, Preconsolidation PressureII