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Utilization of cone penetration tests in the load-transfer method for bored large diameter piles
Štetiar, Juraj ; Koudela, Pavel (oponent) ; Chalmovský, Juraj (vedoucí práce)
This thesis is focused on the use of the results of cone penetration tests and the method of transfer functions for the design of drilled large-diameter piles. The introductory part clarifies the theoretical basis of cone penetration testing, method of transfer functions, various material models and the regression coefficients in the nonlinear method of pile settlement calculation. The theoretical introduction will be followed by other chapters in which the theory is applied to specific practical cases. The third part consists of geotechnical interpretation of the results of two static load tests in two different localities using graphical and numerical outputs (limit load curves, force distribution along the length of the pile, dependences of displacements and deformations on the pile depth, shaft frictions and more). The next part deals with the evaluation of the CPT at the site of the load test and the compilation of the calculation profile at the site based on the obtained data. In the fifth part there will be an inverse analysis of load tests using the method of transfer functions in the software developed at the Institute of Geotechnics, Faculty of Civil Engineering, Brno University of Technology. An inverse analysis of load tests using finite elements method and obtained data from the CPT can be found in chapter 6. Within this analysis, several material models will be applied and compared to the issue. This analysis will be followed in the fifth part by a comparison of direct correlation methods for determining the ultimate pile shaft friction from CPT data with the results of inverse analysis by MTF to determine the most suitable method. Finally, from the obtained data the regression coefficients will be adjusted for the calculation of the second limit state of lone piles by a nonlinear method (according to Masopust).
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Algoritmizace metody ELSM pro pokročilou stabilitní analýzu
Štetiar, Juraj ; Koudela, Pavel (oponent) ; Chalmovský, Juraj (vedoucí práce)
Táto diplomová práca sa zaoberá problematikou stability svahu, ktorá predstavuje kľúčovú úlohu pri návrhu geotechnických konštrukcií. V práci sa skúma Enhanced Limit Strength Method (ELSM), ktorá využíva výhody metódy konečných prvkov (MKP) a zároveň umožňuje regulovať pozíciu a tvar šmykovej plochy. ELSM je preto výhodná pre riešenie stability návodných a vzdušných svahov sypaných zemných vodných nádrží. Cieľom práce je vytvoriť algoritmus pre metódu ELSM ako prídavný modul pre existujúce MKP riešiče. Teoretická časť práce sa venuje vysvetleniu princípov bežne používaných metód výpočtu stability svahu, ako sú metóda medznej rovnováhy (Limit Equilibrium Method - LEM) a metóda redukcie šmykovej pevnosti (Strenght Reduction Method - SRM). Následne je predstavený princíp metódy ELSM (stanovenia stupňa bezpečnosti pre kritickú šmykovú plochu) a stručne popísaný optimalizačný algoritmus rojom častíc (Particle Swarm Optimization - PSO). V praktickej časti práce je vysvetlený naprogramovaný algoritmus pre výpočet stability svahu pomocou metódy ELSM s využitím Particle Swarm Optimization (PSO). Overenie správnosti algoritmu a porovnanie s metódami SRM a LEM prebehlo na troch overovacích štúdiách, vrátane jednoduchého homogénneho svahu, heterogénneho svahu s horizontálnym materiálovým rozhraním a reálnej úlohy posúdenia vonkajšej stability zemného telesa vodného diela Vlachovice.
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Utilization of cone penetration tests in the load-transfer method for bored large diameter piles
Štetiar, Juraj ; Koudela, Pavel (oponent) ; Chalmovský, Juraj (vedoucí práce)
This thesis is focused on the use of the results of cone penetration tests and the method of transfer functions for the design of drilled large-diameter piles. The introductory part clarifies the theoretical basis of cone penetration testing, method of transfer functions, various material models and the regression coefficients in the nonlinear method of pile settlement calculation. The theoretical introduction will be followed by other chapters in which the theory is applied to specific practical cases. The third part consists of geotechnical interpretation of the results of two static load tests in two different localities using graphical and numerical outputs (limit load curves, force distribution along the length of the pile, dependences of displacements and deformations on the pile depth, shaft frictions and more). The next part deals with the evaluation of the CPT at the site of the load test and the compilation of the calculation profile at the site based on the obtained data. In the fifth part there will be an inverse analysis of load tests using the method of transfer functions in the software developed at the Institute of Geotechnics, Faculty of Civil Engineering, Brno University of Technology. An inverse analysis of load tests using finite elements method and obtained data from the CPT can be found in chapter 6. Within this analysis, several material models will be applied and compared to the issue. This analysis will be followed in the fifth part by a comparison of direct correlation methods for determining the ultimate pile shaft friction from CPT data with the results of inverse analysis by MTF to determine the most suitable method. Finally, from the obtained data the regression coefficients will be adjusted for the calculation of the second limit state of lone piles by a nonlinear method (according to Masopust).
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