Refine
Document Type
- Master's Thesis (5)
- Doctoral Thesis (4)
- Conference Proceeding (2)
- Article (1)
- Report (1)
Institute
- Professur Bodenmechanik (13) (remove)
Keywords
- Architektur <Informatik> (2)
- Bender elements (2)
- CAD (2)
- Computerunterstütztes Verfahren (2)
- Shear modulus (2)
- Soil (2)
- Anomale Dispersion (1)
- Baustoff (1)
- Bentonit (1)
- Bentonit-Sand (1)
- Bentonit-Sandgemische (1)
- Bentonite-sand (1)
- Boden (1)
- Bodenanalyse (1)
- Bodenmechanik (1)
- Dispersion <Welle> (1)
- Durchlässigkeit (1)
- Ebener Dehnungszustand (1)
- Energieübertragung (1)
- Geochemical modeling; Soils; High-pressure behavior; bentonite; clays; expansive clays (1)
- Hostun-Sand (1)
- Hydraulic properties (1)
- Hydromechanik (1)
- Inverses Problem (1)
- Inversionsalgorithmus (1)
- Inversionstheorie (1)
- Kennwertermittlung (1)
- Konsolidation (1)
- Parameterschätzung (1)
- Quelldruck (1)
- Quellen (1)
- Sandsäulenversuch (1)
- Saugspannung (1)
- Seismik (1)
- Shear wave (1)
- Soil dynamics (1)
- Sraßeninstandhaltung (1)
- Straßenbau (1)
- Straßenplanung (1)
- TDR-Kalibrierung (1)
- Temperatur (1)
- Time domain reflectometry (1)
- Ton (1)
- Ungesättigte Zone (1)
- Unsaturated soil (1)
- Wellenausbreitung (1)
- Zustand von Strassenbau (1)
- bentonite-sand mixture (1)
- bentonite-sand mixtures (1)
- biaxial – sand (1)
- biaxial-sand (1)
- determination of soil properties (1)
- drying-wetting (1)
- evaluation (1)
- hydro-mechanics (1)
- hydromechanische Prozesse (1)
- inversion procedure (1)
- inversion theorie (1)
- mathematische Optimierungsmethoden (1)
- nichtlineare Konsolidationstheorie (1)
- non-linear consolidation (1)
- numerical methods (1)
- numerische Berechnungen (1)
- plane-strain conditions (1)
- polymer-enhanced (1)
- road (1)
- seimic measurements (1)
- seismische Messungen (1)
- soil column test (1)
- soil mechanics (1)
- soil water characteristic curve (1)
- suction (1)
- swelling (1)
- swelling pressure (1)
- teilgesättigte Böden (1)
- temperature (1)
- unsaturated permeability (1)
- unsaturated soils (1)
- wave field dispersion (1)
- wave propagation (1)
The initial shear modulus, Gmax, of soil is an important parameter for a variety of geotechnical design applications. This modulus is typically associated with shear strain levels about 5*10^-3% and below. The critical role of soil stiffness at small-strains in the design and analysis of geotechnical infrastructure is now widely accepted.
Gmax is a key parameter in small-strain dynamic analyses such as those to predict soil behavior or soil-structure interaction during earthquake, explosions, machine or traffic vibration where it is necessary to know how the shear modulus degrades from its small-strain value as the level of shear strain increases. Gmax can be equally important for small-strain cyclic situations such as those caused by wind or wave loading and for small-strain static situations as well. Gmax may also be used as an indirect indication of various soil parameters, as it, in many cases, correlates well to other soil properties such as density and sample disturbance. In recent years, a technique using bender elements was developed to investigate the small-strain shear modulus Gmax.
The objective of this thesis is to study the initial shear stiffness for various sands with different void ratios, densities, grain size distribution under dry and saturated conditions, then to compare empirical equations to predict Gmax and results from other testing devices with results of bender elements from this study.
Heat, gas, and leachate are primary by-products of landfill processes in municipal solid waste landfills. In nuclear waste repository, temperature of the waste also raises due to radioactivity processes. Temperature increase in the repository induces hydro-mechanical processes of its sealing material. Moderate to high temperature is expected to be encountered in the field situation. In this thesis, a study on the thermo-hydro-mechanical behavior of compacted bentonite-sand mixtures which are among the materials proposed to be used as sealing material for landfills and hazardous waste repository is presented. Mixtures of a calcium-type bentonite, Calcigel, and quartz sand were used in this study. Series of tests including suction and swelling pressure measurement, drying-wetting under unconfined and confined conditions were conducted at a moderately high temperature. Tests at room temperature including basic and physico-chemical characterization, microstructure and fabric studies, and osmotic suction were conducted in order to provide insight into understanding the hydro-mechanical processes taking place in the bentonite. The experimental data obtained are presented and compared to the result of the previous tests for the same material performed by other researchers at room temperature. The changes in hydro-mechanical behavior due to elevated temperature were analyzed and discussed based on the suction components of soil which are influenced by temperature. At the end, conclusions concerning the temperature effects on the hydro-mechanical behavior of the materials are drawn and suggestions for future studies are made.
In this dissertation, a new, unique and original biaxial device for testing unsaturated soil was designed and developed. A study on the mechanical behaviour of unsaturated sand in plane-strain conditions using the new device is presented. The tests were mainly conducted on Hostun sand specimens. A series of experiments including basic characterisation, soil water characteristic curves, and compression biaxial tests on dry, saturated, and unsaturated sand were conducted. A set of bearing capacity tests of strip model footing on unsaturated sand were performed. Additionally, since the presence of fine content (i.e., clay) influences the behavior of soils, soil water characteristic tests were also performed for sand-kaolin mixtures specimens.