- Zeitschriftendaten
- Format
- Zeitschrift
- eISSN
- 2083-831X
- Erstveröffentlichung
- 09 Nov 2012
- Erscheinungsweise
- 4 Hefte pro Jahr
- Sprachen
- Englisch
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- Open Access
Seismic codes based equivalent nonlinear and stochastic soil structure interaction analysis
Seitenbereich: 1 - 14
Zusammenfassung
The aim of this study is to consider the effects of the variation of shear modulus ratio (
Schlüsselwörter
- Shear modulus
- damping
- uncertainties
- linear iterative method
- seismic code
- Open Access
Influence of Waste Toothbrush Fiber on Strength and Freezing–Thawing Behavior in High Plasticity Clay
Seitenbereich: 15 - 21
Zusammenfassung
The use of waste materials in civil engineering applications has gained importance nowadays. Consuming limited natural resources and increasing waste disposal costs have led researchers to evaluate waste materials for different geotechnical applications. In this respect, some waste materials are used as reinforcement in soils to improve their engineering properties. The main objective of this paper was to investigate the usability of waste polypropylene fiber as a reinforcement material in high plasticity fine-grained soils. For this purpose, waste toothbrush bristle (WTB) was used as a polypropylene fiber reinforcement material and added to fine-grained soil at ratios of 0.2%, 0.4%, 0.6% and 0.8% by dry total weight. The effect of WTB on freezing–thawing behavior and unconfined compression strength of unreinforced and reinforced clayey soil was evaluated. The results indicated that addition of WTB to high plasticity clay improved its behavior against freezing–thawing. Also, undrained shear strength increases with respect to increment in WTB ratio.
Schlüsselwörter
- Waste material
- Polypropylene fiber
- Toothbrush bristle
- Freezing–thawing
- Unconfined compression test
- Reinforced clay
- Open Access
Numerical Modeling of Wall Pressure in Silo with and Without Insert
Seitenbereich: 22 - 33
Zusammenfassung
This paper presents a methodology based on the finite element method to simulate the flow of granular materials. Moreover, it allows proper estimation of dynamic pressure during silo discharge since this subject is still under discussion, especially for designing silos with an insert (an input element). A 2-D simulation of the discharge process of a cylindrical silo with cone and a central discharging orifice was performed. Two cases were studied, with and without using insert in silo. Numerical analysis was carried out with the help of the uncoupled arbitrary Lagrangian–Eulerian (ALE) approach. The resulting dynamic pressure distribution on the silo wall for each of the two cases was inferred numerically. The resulting values of pressure were compared with the results of the experimental study on a cylindrical metal silo to demonstrate the accuracy of the numerical model in determining the dynamic wall pressure, especially in the case of using an insert in silo during discharge.
Schlüsselwörter
- Numerical modeling
- silo
- silo model
- flow pressure
- insert
- wall pressure
- Open Access
Numerical analysis of tailing dam with calibration based on genetic algorithm and geotechnical monitoring data
Seitenbereich: 34 - 47
Zusammenfassung
The article presents a method of calibration of material parameters of a numerical model based on a genetic algorithm, which allows to match the calculation results with measurements from the geotechnical monitoring network. This method can be used for the maintenance of objects managed by the observation method, which requires continuous monitoring and design alterations. The correctness of the calibration method has been verified on the basis of artificially generated data in order to eliminate inaccuracies related to approximations resulting from the numerical model generation. Using the example of the tailing dam model the quality of prediction of the selected measurement points was verified. Moreover, changes of factor of safety values, which is an important indicator for designing this type of construction, were analyzed. It was decided to exploit the case of dam of reservoir, which is under continuous construction, that is dam height is increasing constantly, because in this situation the use of the observation method is relevant.
Schlüsselwörter
- soil parameters
- optimization
- slope stability
- genetic algorithm
- observational method
- monitoring
- Open Access
3D DEM simulations of basic geotechnical tests with early detection of shear localization
Seitenbereich: 48 - 64
Zusammenfassung
This paper deals with elementary geotechnical tests: triaxial and direct shear of cohesionless sand using the discrete element method (DEM). The capabilities of the numerical DEM code are shown, with a special focus on the early phenomena appearance in localization zones. The numerical tests were performed in 3D conditions with spherical grains. Contact moments law was introduced due to simulate not perfectly round sand grains. The influence of different physical parameters was studied, e.g. initial density or confining pressure. The sieve curve corresponded to the Karlsruhe sand [
Schlüsselwörter
- direct shear
- granular material
- discrete element method
- localization
- grain level