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National Repository of Grey Literature 2 records found  Search took 0.01 seconds. 
The Character of structural bond of loess
 Fikar, Lukáš ; Rott, Josef (advisor) ; Herle, Vítězslav (referee)
5 Abstract This diploma thesis deals with nature of loess's structural bonds. Research part of the thesis aims to clarify types of bonding forces that interact between particles and what effect these forces have on overall strength of the loess. Next equally important objective was to resolve(clarify) what causes weakening of these bonding forces leading to reduction in soil volume, which may result in complete collapse of its entire structure. As part of the research, loess samples undergone significant amount of laboratory analyzes in order to expand knowledge about its grain size and mineral composition to achieve better understanding regarding behavioral mechanisms working inside the studied soil. Peak practical part experiment was performed as an analysis on loess samples during air pressure conditions and vacuum to determine which of the coupling forces have the most significant effect on the final strength of loess's structure. Keywords: loess, structural bonds, collapsible soils
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Mechanical behaviour of variably saturated clay fills
 Kostkanová, Vladislava ; Boháč, Jan (advisor) ; Kurka, Jan (referee) ; Vaníček, Ivan (referee)
Mechanical behaviour of variably saturated clay fills VLADISLAVA KOSTKANOVÁ Ph.D. Thesis - English Abstract The excavated overburden from open-cast coal mines is end-dumped in fills. Clay type soil prevails among the filled soils in North-western Bohemia. As a consequence of the character and state of the soil, together with the mining and dumping technology, a typical lumpy structure of the clay fill is formed. The filled lumps range in size and vary in mechanical properties, but stiff to solid lumps up to 0.5 m in size are prevalent. Large and open macrovoids between the single lumps are a characteristic feature of the clay fills. Clay fills exhibit a double porosity structure, consisting of intergranular porosity between the lumps and intragranular porosity inside them. The total porosity of the freshly filled soils can reach 70%. This type of clay fill structure is metastable. This thesis focuses on the problematic behaviour of clay fill soils due to their metastable structure and their partly saturated state. Long-term monitoring of matric suction at depths up to 2 metres in two reclaimed clay fills revealed two different trends. Seasonally-dependent suction oscillations were recorded in the moderate slope of the clay fill in the Bílina mine, while no suction pointing to fully saturated conditions was...
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