Vpliv stopnje prekonsolidacije in hitrosti striženja v direktnem strižnem aparatu na strižne karakteristike zemljin : diplomska naloga

Šelekar, Nives (author), Petkovšek, Ana (mentor)

V diplomski nalogi smo raziskovali, kako različni pogoji striženja vplivajo na rezultate določitve strižne trdnosti v direktnem strižnem aparatu. Strižne preiskave smo izvajali pri različnih hitrostih striženja, brez prekinitve in s prekinitvijo. Preiskovali smo tudi vplive izbranega območja vertikalnih normalnih napetosti ter vplive prekonsolidacije na rezultat preiskave. Material, ki smo ga uporabili v raziskavah je morski sediment iz Luke Koper, ki se črpa iz morskega dna in skladišči na kopnem v začasnih bazenih. Zato se ta sediment imenuje reful. Za identifikacijo refula smo opravili raziskave, s katerimi smo določili vlažnost, gostoto zrn – metoda s piknometrom, zrnavostno sestavo, Attebergove meje plastičnosti in vpijanje vode po Enslin Neffu. Ugotovili smo, da hitrost striženja in stopnja prekonsolidacije zelo vplivata na rezultate raziskav.

• Language: Slovenian
• Keywords: gradbeništvo, diplomska naloga, UNI, direktna strižna preiskava, strižna trdnost, prekonsolidacija, hitrost striženja
• Work type: Bachelor thesis/paper
• Typology: 2.11 - Undergraduate Thesis
• Organization: FGG - Faculty of Civil and Geodetic Engineering
• Place of publishing: Ljubljana
• Publisher: [N. Šelekar ]
• Year: 2015
• Number of pages: IX, 32 str.
• PID: 20.500.12556/RUL-72816
• COBISS.SI-ID: 7279713
• Publication date in RUL: 02.10.2015

Secondary language

• Language: English
• Title: Effects of overconsolidation ratios and the shear rate on the shear strength of soils in the direct shear apparatus

Abstract

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

• Keywords: direct shear test, shear strenght, overconsolidation, shear rate