| ATTRIBUTE | VALUE |
|---|
| type | A |
| database id | 3965 |
| title | Influence of fly ashes on hardening slurries resistance to sulphate attack |
| authors | Zbigniew Kledyński |
| pages | 119 — 133 |
| full text link | http://www.ibwpan.gda.pl/storage/app/media/ahem/ahem51str119.pdf |
| keywords | groundwater protection, sulphate attack, cut-off walls, hardening slurries |
| affiliations | - Warsaw University of Technology, Faculty of Environmental Engineering, Institute of Water Supply and Hydraulic Engineering, ul. Nowowiejska 20, 00-653 Warsaw, Poland, e-mail: zbigniew.kledynski@is.pw.edu.pl
|
| abstracts | Rapid development of slurry wall technology in the underground constructions caused a noticeable increase in interest, cut-off walls well known in the past. Introduction of hardening slurry to this technology makes their construction easier and creates new possibilities for their application. Current challenge lies in subsoil insulation in order to avoid contamination spread into the ground waters. Thus, besides the already well known problems, new ones appeared, in that the issue of corrosion, especially of a chemical nature, to which the cut-off walls are exposed in the environment of aggressive groundwater. The paper focuses on the assessment of the hardening slurries to sulphate attack. The results of own investigations of cement-bentonite hardening slurry and cement-bentonite-ash hardening slurry prepared with the addition of aggressive liquid, as well as, with tap water and kept in a sulphate ion medium for 1 year are presented. Contamination spreading in non-filtration conditions was modelled. Tests of samples made with tap water and stored in tap water are considered as controls. The paper presents results of tests of liquid slurries properties and results of assessments of hardened slurries. Changes in mass of slurries, compressive and tensile strength and changes in sample storage environment chemistry were measured. Thermographic investigations of slurries were also conducted. The results of investigations and review of literature data on hardening slurries corrosion resistance to sulphate attack are presented. Practical suggestions in relation to the application of cut-off walls made of hardening slurries are made. |
| attributes | [reviewed] [scientific] |
| language | en |
| ATTRIBUTE | VALUE |
|---|
| type | A |
| database id | 3966 |
| title | Pullout tests of geogrids embedded in non-cohesive soil |
| authors | Angelika Duszyńska, Adam F. Bolt |
| pages | 135 — 147 |
| full text link | http://www.ibwpan.gda.pl/storage/app/media/ahem/ahem51str135.pdf |
| keywords | pullout, geogrid, laboratory research, testing |
| affiliations | - Gdansk University of Technology, Faculty of Hydro and Environmental Engineering ul. Narutowicza 11/12, 80-952 Gdańsk, Poland, e-mail: adusz@pg.gda.pl
|
| abstracts | A source of essential information regarding the behaviour of the soil-reinforcement system can be laboratory pullout tests. In this paper, basic aspects of such testing concerning the equipment used (designed and constructed in the Geotechnical Laboratory of Gdańsk University of Technology) and procedures applied are described. The pullout tests carried out for biaxial polypropylene geogrids embedded in coarse sand are presented. Finally basing on the test results the interpretation procedure for the estimation of elasto-plastic interaction between geogrid and soil is proposed. The method proposed enables determining soil-geogrid interface: stiffness modulus responsible for elastic behaviour of the system in the range of permissible loads, as well as maximum pullout resistance corresponding to limit state. |
| attributes | [reviewed] [scientific] |
| language | en |
| ATTRIBUTE | VALUE |
|---|
| type | A |
| database id | 3967 |
| title | Effect of heterogeneity on shear zone formation during plane strain compression |
| authors | Jacek Tejchman |
| pages | 149 — 181 |
| full text link | http://www.ibwpan.gda.pl/storage/app/media/ahem/ahem51str149.pdf |
| keywords | heterogeneity, mean grain diameter, polar continuum, shear zone, void ratio |
| affiliations | - Civil Engineering Department, Gdańsk University of Technology 80-952 Gdańsk, Narutowicza 11/12, Poland, e-mail: tejchmk@pg.gda.pl
|
| abstracts | Heterogeneity of granular materials triggers shear zone formation. In the paper, the FE-analysis of the effect of the material heterogeneity on the formation of a spontaneous shear zone inside of granular materials during a plane strain compression test is presented. The numerical calculations are performed with a finite element method on the basis of a hypoplastic constitutive law extended by polar quantities: rotations, curvatures and couple stresses. A mean grain diameter is used as a characteristic length. The constitutive law takes into account the effect of pressure, void ratio, direction of deformation rate and mean grain diameter on the behaviour of granular bodies. The heterogeneity in the granular body is assumed in the form of spots with a different initial void ratio. The spots are single or distributed randomly and stochastically with an exponential probability function. The single spots are distributed sparsely and densely in an initially dense and loose granular specimen. Special attention is focused on the effect of heterogeneity on the onset of shear localization and its thickness at residual state. |
| attributes | [reviewed] [scientific] |
| language | en |
| ATTRIBUTE | VALUE |
|---|
| type | A |
| database id | 3969 |
| title | Comparison of five depth-averaged 2-D turbulence models for river flows |
| authors | Weiming Wu, Pingyi Wang, Nobuyuki Chiba |
| pages | 183 — 200 |
| full text link | http://www.ibwpan.gda.pl/storage/app/media/ahem/ahem51str183.pdf |
| keywords | turbulence model, depth-averaged two-dimensional model, river flow, zero-equation turbulence model, k-e turbulence model |
| affiliations | - National Center for Computational Hydroscience and Engineering The University of Mississippi, MS 38677, email: wuwm@ncche.olemiss.edu
|
| abstracts | In this study, five depth-averaged 2-D turbulence models for river flows, including the depth-averaged parabolic eddy viscosity model, modified mixing length model, standard k-e turbulence model, non-equilibrium k-e turbulence model and re-normalized group (RNG) k-e turbulence model, are compared in the simulation of flows around a spur-dyke, in a sudden-expanded flume and in two natural rivers. It is shown that in the two field cases where the channel geometries are simple, all five models can give generally good predictions for the main flow features. However, in the two laboratory cases where the channel geometries are complex, differences have been found among these models. The depth-averaged parabolic eddy viscosity model over-predicts the recirculation flows behind the spur-dyke and the flume expansion. The modified mixing length model gives better prediction than the depth-averaged parabolic model. The standard k-e turbulence model predicts well for the recirculation flow in the sudden-expended flume, but under-predicts the length of recirculation zone behind the spur-dyke, while the non-equilibrium and RNG k-e turbulence models provide good results for both laboratory cases. |
| attributes | [reviewed] [scientific] |
| language | en |
| ATTRIBUTE | VALUE |
|---|
| type | A |
| database id | 3889 |
| title | Long water waves as a structure fluid interaction problem |
| authors | Wilde P., Chybicki W. |
| pages | 95 — 118 |
| full text link | http://www.ibwpan.gda.pl/storage/app/media/ahem/ahem51str095.pdf |
| keywords | long waves, Lagrangian description, Hamiltonian principle |
| affiliations | - Institute of Hydro-Engineering of the Polish Academy of Sciences, ul. Kościerska 7, 80-953 Gdańsk, Poland, e-mails: p_wilde@ibwpan.gda.pl, wchyb@ibwpan.gda.pl
|
| abstracts | The paper describes a new formulation of the theory of long shallow water waves, which is based on the fundamental assumption that vertical material lines of fluid remain vertical during the entire motion. To make the problem consistent from the point of view of physics the case of waves in a flume due to the motion of a piston type generator is considered. At the piston the material line of water particles remains vertical during the entire motion and thus the generation follows the assumption in the description of the motion of water in the flume. Wave equations are derived with the help of a variational formulation of the problem in a material description. The Lagrangian is the difference between the kinetic and potential energies of the fluid and the mechanical system that describes a very simplified wave generator. The basic assumption simplifies the geometry of the displacement field. The definitions of generalized forces follow from variational calculus. The procedure ensures that the energy is preserved. A simple discrete formulation of the problem is based on the finite element method and the corresponding approximate expressions for energies. |
| attributes | [reviewed] [scientific] |
| language | en |
| points | 6 |
