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Modelling of diaphragm walls using time-dependent elasto-plastic material model
Šindelářová, Daniela ; Kotačková, Alena (referee) ; Chalmovský, Juraj (advisor)
The goal of this thesis was the verification of the advanced time-dependent elasto-plastic material model for modeling diaphragm walls. Currently, this type of construction is solved usually with a combination of linear-elastic volume and plate elements. To express time-dependent behaviour, there are both, volume and plate, elements active in short-term conditions, then only volume elements in long-term conditions, while plate elements are deactivated. In this thesis, the Shotcrete material model, which can capture the time-dependent behaviour without combining two types of construction elements, is used. First, a theory of time-dependent behaviour is presented and a design of concrete structures by Eurocode 2 is discussed. Next, the Shotcrete material model is described, then used for modeling a biaxial test and calibration of compression and bending test. Following the gained knowledge, a real boundary value problem of deep excavation supported by diaphragm walls with the strut was solved. To calculate values of the internal forces and horizontal deformation in diaphragm walls, three types of material models are used.
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Application of fiber reinforcement to improve soil mechanical properties
Šindelářová, Daniela ; Miča, Lumír (referee) ; Chalmovský, Juraj (advisor)
The goal of this thesis was the summarization of available information about Fiber-reinforced soil. In the past, many of the previous works were published around the world. This thesis compares what type of fibres are in previous studies used – especially material, their size and amount in the Fiber-reinforced soil. All of these parameters were quite various, some of the sources used small-sized fibres, some used large-sized fibres. The most common material was polypropylene, although it was not the only one. For example, natural fibres, other synthetic materials, and waste materials can be mentioned. The amount of the fibres in the soil is measured in a few different ways, so in this thesis are these ways compared. It is necessary to run laboratory tests to quantify the effect of the fibres on the mechanical engineering properties of the soil. These tests are quite different compared to tests run on the unreinforced soil, so these differences are mentioned. The ways, how Fiber-reinforced soil was tested in different studies, are compared. From laboratory tests can be mentioned triaxial shear test, direct shear test and for Fiber-reinforced soil typical pullout test. At the end of this thesis are said and compared material models available for Fiber-reinforced soil design.
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Modelling of diaphragm walls using time-dependent elasto-plastic material model
Šindelářová, Daniela ; Kotačková, Alena (referee) ; Chalmovský, Juraj (advisor)
The goal of this thesis was the verification of the advanced time-dependent elasto-plastic material model for modeling diaphragm walls. Currently, this type of construction is solved usually with a combination of linear-elastic volume and plate elements. To express time-dependent behaviour, there are both, volume and plate, elements active in short-term conditions, then only volume elements in long-term conditions, while plate elements are deactivated. In this thesis, the Shotcrete material model, which can capture the time-dependent behaviour without combining two types of construction elements, is used. First, a theory of time-dependent behaviour is presented and a design of concrete structures by Eurocode 2 is discussed. Next, the Shotcrete material model is described, then used for modeling a biaxial test and calibration of compression and bending test. Following the gained knowledge, a real boundary value problem of deep excavation supported by diaphragm walls with the strut was solved. To calculate values of the internal forces and horizontal deformation in diaphragm walls, three types of material models are used.
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Application of fiber reinforcement to improve soil mechanical properties
Šindelářová, Daniela ; Miča, Lumír (referee) ; Chalmovský, Juraj (advisor)
The goal of this thesis was the summarization of available information about Fiber-reinforced soil. In the past, many of the previous works were published around the world. This thesis compares what type of fibres are in previous studies used – especially material, their size and amount in the Fiber-reinforced soil. All of these parameters were quite various, some of the sources used small-sized fibres, some used large-sized fibres. The most common material was polypropylene, although it was not the only one. For example, natural fibres, other synthetic materials, and waste materials can be mentioned. The amount of the fibres in the soil is measured in a few different ways, so in this thesis are these ways compared. It is necessary to run laboratory tests to quantify the effect of the fibres on the mechanical engineering properties of the soil. These tests are quite different compared to tests run on the unreinforced soil, so these differences are mentioned. The ways, how Fiber-reinforced soil was tested in different studies, are compared. From laboratory tests can be mentioned triaxial shear test, direct shear test and for Fiber-reinforced soil typical pullout test. At the end of this thesis are said and compared material models available for Fiber-reinforced soil design.
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