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Horizontal stress in Brno Clay determined by oedometer test
Krupička, Martin ; Boháč, Jan (advisor) ; Mašín, David (referee)
This Thesis deals with the determination of horizontal effective stress in-situ the clay massif in the city of Brno. To determine the value of the horizontal in-situ stress was at first established value of the coefficient of earth pressure at rest K0, which captures stress conditions in the massif and which is a main part of this Thesis. To determine the value of K0 was used the method of the ratio of the horizontal to vertical preconsolidation pressure. Pseudo-preconsolidation pressure used to calculate K0 was determined by using standard oedometer compression tests of oriented undisturbed samples. Research part of the Thesis deals with the issues of evolution of K0 during secondary compression and results of previous published data. The results obtained from own experiments are discussed and compared with the results of previous published data.
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Stiffness anisotropy of Brno Tegel determined by bender elements
Krupička, Martin ; Najser, Jan (advisor) ; Malát, Richard (referee)
This Thesis deals with the determination of shear moduli of Brno Neogene clay ("tegel") in various directions and the determination of its stiffness anisotropy. The basic measure of stiffness anisotropy in this thesis is considered to be the degree of anisotropy αG given by the ratio of shear moduli in the horizontal (Ghh) and vertical direction (Gvh). Measurements of shear wave velocity were performed on undisturbed vertically and horizontally oriented samples of the Brno tegel in triaxial cell using piezoceramic sensors, so-called bender elements. As an advanced method for determining the degree of anisotropy of the material, another pair of bender elements was used in the measurements, mounted horizontally on the side walls of the sample in the triaxial cell. Based on these measurements, the values of shear moduli Ghh and Gvh for different stress levels were determined. The ratio of shear moduli then determined the degree of anisotropy αG ≈ 1,43 for the given stresses, as the most reliable value based on performed experiments. Literature review part of the thesis briefly summarizes the existing findings from research of physical and mechanical properties of the Brno tegel.
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Horizontal stress in Brno Clay determined by oedometer test
Krupička, Martin ; Boháč, Jan (advisor) ; Mašín, David (referee)
This Thesis deals with the determination of horizontal effective stress in-situ the clay massif in the city of Brno. To determine the value of the horizontal in-situ stress was at first established value of the coefficient of earth pressure at rest K0, which captures stress conditions in the massif and which is a main part of this Thesis. To determine the value of K0 was used the method of the ratio of the horizontal to vertical preconsolidation pressure. Pseudo-preconsolidation pressure used to calculate K0 was determined by using standard oedometer compression tests of oriented undisturbed samples. Research part of the Thesis deals with the issues of evolution of K0 during secondary compression and results of previous published data. The results obtained from own experiments are discussed and compared with the results of previous published data.
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