Effects of overconsolidation ratios and the shear rate on the shear strength of soils in the direct shear apparatus

摘要

In our thesis we investigated how the shear rate and the overconsolidation ratio (OCR)udinfluence the measured shear strength in the direct shear apparatus. Shear tests wereudperformed also by comparing the influence of low and higher vertical normal stress as well asudthe temporary breakage during shearing to the test results. The test samples were takenudfrom the temporary lagoons, where the dredged mud from the Port of Koper has been stored.udThe tests performed to identify the physical properties of the mud included determination of:udwater content, Atterberg limits, particle density, particle size distribution and water adsorptionudby Enslin Neff. We found that the the shear rate and the overconsolidation ratio have a largeudinfluence on the measured shear strenght in the direct shear apparatus.