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Dilatancy of soils as a factor influencing the bearing capacity and load - displacement response of deep foundations
Dvořák, Tomáš ; Koudela, Pavel (referee) ; Chalmovský, Juraj (advisor)
In theory of soil mechanic the dilatancy has a significant influence, which may fundamentally affect bearing capacity and behavior of geotechnical constructions. In the past it was difficult to include influence of dilatancy directly in to calculation, but now with development of numerical analysis and growth of computer performance it is much easier. In this work there are introduced fundamental dilatancy models and phenomen called constraint dilatancy, which causes stress changes in soil or at soil – construction interface. This stress changes may lead to higher bearing capacity. In this work, the effect of constraint dilatancy is focused on bored pile’s shaft. Next target of this work is including dilatancy to calculation. By empirical methods, by direct application with theory of cylindrical cavity expansion and last by numerical calculation with finite element method in software Plaxis with using the Hardening Soil model.
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Evaluation of loading test of jet-grouted piles
Čechová, Simona ; Račanský, Václav (referee) ; Chalmovský, Juraj (advisor)
The master thesis consists of a theoretical part and a practical part. In the theoretical part jet-grouting technology is described briefly. Mechanical properties of jet-grouted piles were characterized. Various estimation methods of ultimate pile bearing capacity are described in this thesis – analytical calculation of ultimate bearing capacity for bored piles and estimation of ultimate pile bearing capacity by analysis of load-displacement curve defined by CHIN (1970; 1972). Load transfer method for piles and hyperbolic load-transfer curve are introduced. As a part of the load-trasfer method analysis, a method of estimating ultimate pile shaft friction called beta method is defined. In the practical part were evaluated several static load tests of jet-grouted piles and were constructed their load-displacemnt curves. Then reverse analysis of the results from static load tests was performed using load-transfer method. Then ultimate pile bearing capacity was estimated using analytical calculation of pile bearing capacity for bored piles and using analysis of load-displacement curve with method by CHIN (1970; 1972). By evaluation of load transfer method and beta method ultimate shaft resistence for each pile was estimated. Results and load-displacement curves were compared.
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Back-analysis of instrumented load test of large-diameter bored pile using load-transfer method
Bírošík, Matej ; Koudela, Pavel (referee) ; Chalmovský, Juraj (advisor)
The thesis is divided into four parts. The first part is theoretical and consists of description of load-transfer method and its principal defined by (Reddy a ďaľší, 1998), where is explained calculating algorithm for predicting behaviour of loaded large-diameter bored piles. In the second part are all information about analysed instrumented load tests including measured values, which are interpreted by tables and graphs of load-transfer curves, load transfers in individual sections and shear friction values along the pile. This part also includes analyses of the influence of the pile axial stiffness uncertainty. The third part consists of parametric study. This study displays effects of different parameters on pile behaviour prediction during loading through load-transfer curves and load transfers in individual sections along the pile obtained from the programme developing at the Institute of Geotechnics, Faculty of Civil Engineering BUT in Brno, for large-diameter bored piles behaviour prediction. In the fourth part is evaluation and description of back-analysis of two instrumented load tests by already mentioned programme. The goal in the back-analysis was to reach the same parameters of load-transfer curves and load transfers in individual sections along the pile by surrounding soil parameters adjusting.
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Foundation pit design
Valkó, Attila ; Boštík, Jiří (referee) ; Doněk, Michal (advisor)
Diploma thesis deals with securing of foundation pit of family house in given geological conditions situated in Brno-Kohoutovice. The aim of the thesis is to list possible solutions of securing foundation pits in general and solve this geotechnical problem with an appropriate solution. Static calculations were performed by geotechnical software GEO5.
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Foundation pit design
Valkó, Attila ; Boštík, Jiří (referee) ; Doněk, Michal (advisor)
Diploma thesis deals with securing of foundation pit of family house in given geological conditions situated in Brno-Kohoutovice. The aim of the thesis is to list possible solutions of securing foundation pits in general and solve this geotechnical problem with an appropriate solution. Static calculations were performed by geotechnical software GEO5.
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Determination of load-transfer functions for bored piles
Čechová, Simona ; Račanský, Václav (referee) ; Chalmovský, Juraj (advisor)
The thesis is consisted of theoretical and practical part. In theoretical part was described nowadays commonly used method for analysis of single axially loaded replacement piles defined by Masopust (1994). There was also explained principle of load transfer method and was done analysis of mobilization curves, which are applied abroad, and finally were defined essential entry parameters for construction of selected load transfer curves. In practical part method by Masopust (1994) was transformed, limit shear stresses and tip resistances were calculated and values of deformation parameters for constructing cubic root curve and hyperbolic load transfer curve were deterined. In the last step both types of load transfer curves were constructed for shaft and pile tip of a replacement pile in different depths in fine-grained soil and in coarse-grained soil.
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Securing the pit in over-consolidated clay
Svobodová, Nikola ; Chalmovský, Juraj (referee) ; Miča, Lumír (advisor)
Text of an abstract. The aim of the Bachelor’s thesis is design and assessment of the supporting "hypothetical" excavation pit in Neogene Brno clay. The pit is situated near the swimming stadium Za Lužánkami, where subsoil is formed this type of soil. This area is also marked as landslide area. In the first part of the thesis evaluation of the geological and geotechnical conditions is presented. Design and evaluation of the selected supporting system (two times anchored pile wall) cross-section to fulfill the Ultimate Limit State and Serviceability Limit State is described in the third part. The computational program GEO5 Sheeting Design was used to determination of required embedded depth of the wall, number of anchors and internal forces. The assessment of the first limit state of the construction was made partly by hand and partly with the help of the software application. The determination of horizontal movements of pile wall was performed via GEO5 Sheeting Assessment. External stability was analyzed using GEO5 Stability. The last section gives description of the technological construction plan.
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Design of excavation for reconstruction of shopping centre
Červenka, Jan ; Miča, Lumír (referee) ; Chalmovský, Juraj (advisor)
The thesis is divided into three parts. In the first one it deals with the design and the assessment of the once-anchored soldier pile wall, which provides an excavation for the reconstruction of the shopping centre Prior in Zlín. The retaining structure is designed according to the limit state method, using the GEO5 software and the Excel spreadsheet editor. In the second part, the thesis deals with the price comparison of the classic version of the soldier pile wall with soldier pile, IPN profiles, with over one-pole anchorage with the help of the buckle, with the variant with larger spread, where the soldier pile from the pair of UPN profiles are adapted for anchoring. The third part solves the problem of the distribution of a lateral ground pressures along the length of the soldier pile wall. For comparison with the empirical methods of design of lagging, the results of normal pressure from the mathematical model, solved by the numerical analysis, the finite element method, were used in the Plaxis 3D program. Hardening soil model was used as the material model.
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Design of excavation in the Brno city centre
Kováč, Vladimír ; Miča, Lumír (referee) ; Chalmovský, Juraj (advisor)
The work deals with the problem of the ultimate and serviceability limit state of a once-anchored retaining structure of an excavation on Krenova street in Brno. The calculation of the ultimate limit state is solved manually and provides an input into the serviceability limit state, which is solved by means of a numerical analysis using a finite element method. To calculate the serviceability limit state, these constitutive models: Mohr-Columb, Hardening soil and Hardening soil small strain model are used.
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Underground research site Bukov - geotechnical characterization of the site
Souček, Kamil ; Vavro, Martin ; Vavro, Leona ; Staš, Lubomír ; Georgiovská, Lucie
Podzemní výzkumné pracoviště Bukov (PVP) je navrženo jako testovací lokalita pro zhodnocení vlastností a chování horninového masivu, typově blízkého vybraným kandidátním lokalitám, v hloubce odpovídající předpokládané úložné hloubce finálního hlubinného úložiště vysoce aktivních odpadů v České republice. PVP Bukov, jehož výstavba byla zahájena v roce 2013, je realizováno v jižním křídle uranového ložiska Rožná, na severovýchodním okraji strážeckého moldanubika, poblíž jeho styku se svrateckým krystalinikem. Důlní díla pracoviště jsou situována na 12. patře jámy Bukov-1, v hloubce přibližně 600m pod povrchem.
Fulltext: content.csg -  PDF
Plný tet: UGN_0465530 - PDF
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