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Open access

Eugeniusz Koda and Piotr Osiński

Slope erosion control with the use of fly-ash and sewage sludge

The paper presents alternative methods of the earth slopes reinforcement. The techniques proposed utilise recycled materials such as fly-ash and sewage sludge. It is described how implementation of fly-ash made capping materials and hydroseeding method (with the use of the sewage sludge) can effectively control high earth slopes erosion, based on the example of embankment type landfill where remedial works were proceeded. Moreover, it is assessed how the influence of the vegetation cover on engineered landfills, can significantly increase the safety factor of slopes.

Open access

Eugeniusz Koda, Tomasz Kołanka and Piotr Osiński

Abstract

The construction of cut-off walls is a common solution applied in such disciplines as land reclamation and landfill containment. Most commonly the construction of vertical barriers is based on cut-off wall mono or diphase technology with the use of bentonite-cement mixture as a filling material. The content of the paper is focused on groundwater flow and transport numerical modeling conducted on landfill areas where vertical bentonite barriers were constructed. The modeling process was conducted with the use of FEMWATER software which employs analysis based on finite element method. There are two examples of the software application presented in the paper which concern such case studies, i.e., reclamation of Radiowo and Łubna landfill sites. These examples are provided to prove that the appropriate investigation of ground conditions as well as definition of initial and boundary conditions and correct selection of material parameters to be fed into the software, are crucial for the overall modeling process. Moreover, the comparison of results obtained from the numerical modeling and the groundwater monitoring on site is presented for one of the case studies.

Open access

Eugeniusz Koda, Tomasz Kołanka and Piotr Osiński

Abstract

Investigation of soil contamination level beneath the metallurgical waste landfill for the purpose of future reclamation works. One of the most important activities when preparing a land reclamation project of brow fields is a comprehensive analysis and documentation of subsoil conditions at the site. The article presents site investigation methodology conducted for the purpose of preparing land reclamation project of the metallurgical waste landfill, located in a close vicinity of a developed big city. The landfill was a part of the steel plant facilities where combustion by-products were disposed. The article presents range and methodology of contaminated soil survey, waste morphology and composition analyses as well as documentation of obtained results. The research consisted of both, site investigation and laboratory tests. A detailed analysis of the results allowed precise determination of soil contamination indicators, environmental impact zones and volumetric capacity of contaminated soil. On the bases of such methods, as geoelectrical tests, boreholes, geodetic surveys and laboratory chemical analyses of samples, several maps of contamination impact zones were prepared, which at the final stage allowed completing a complex brown field reclamation plan.

Open access

Piotr Osiński, Richmal J. Rickson, Mike J. Hann and Eugeniusz Koda

Abstract

Assessment of slope stability influenced by vegetation cover and additional loads applied. The article presents the results of research conducted in order to create nomographs allowing assessment of slope stability. The proposed recommendations involve graphs and charts, where factor of safety (FOS) is computed in according to six different characteristics: slope height and angle, slope surface vegetation cover, applied surcharge, position of water table, soil mechanical conditions. For the purpose of the research several geotechnical models and approaches were used and became a basis for developing simplified method of predicting the failure of natural and engineered slopes. The advantage of the solutions presented is their simplicity of use; as further FOS calculations are not required during the complex assessment of slope stability

Open access

Adam Deptuła, Piotr Osiński and Marian Partyka

Abstract

This paper presents the way of identifying the influence of the tolerance of model pumps (TYPE 3PWR-SE) construction on the total efficiency. The identification of sensitive control dimensions (Value/Tolerance) of examined pumps has been made by means of the multi-valued logic and inductive decision trees. In order to confirm the obtained results, multiple-valued logic trees have been used in the paper according to algorithms for the minimization of individual logic functions. What is more, a specific monotonicity of values of the most key parameters has been determined for the investigated set of pumps having individual specification numbers.

Open access

Wacław Kollek, Piotr Osiński and Urszula Warzyńska

Abstract

The paper presents the results of numerical calculations of stress distributions in the gear micropump body for applications in hydraulic systems, especially in the marine sector. The scope of the study was to determine the most favorable position of bushings and pumping unit in the gear pump body in terms of stress and displacement distribution in the pump housing. Fourteen cases of gear pump bushings and pumping unit locations were analyzed: starting from the symmetrical position relative to the central axis of the pump, up to a position shifted by 2.6 mm towards the suction channel of the pump. The analysis of the obtained calculation results has shown that the most favorable conditions for pump operation are met when the bushings are shifted by 2.2 mm towards the suction channel. In this case the maximal stress was equal to 109 MPa, while the highest displacement was about 15μm. Strength and stiffness criteria in the modernized pump body were satisfied.

Open access

Adam Deptuła, Piotr Osiński and Urszula Radziwanowska

Abstract

The paper is a continuation of the publication under the title “Acoustic diagnostics applications in the study of technical condition of combustion engine” and concerns the detailed description of decision support system for identifying technical condition (type of failure) of specified combustion engine. The input data were measured sound pressure levels of specific faults in comparison to the noise generated by undamaged motor. In the article, the whole procedure of decision method based on game graphs is described, as well as the interface of the program for direct usage.

Open access

Adam Deptuła, Dariusz Kunderman, Piotr Osiński, Urszula Radziwanowska and Radosław Włostowski

Abstract

The paper presents the possible applications of using acoustic diagnostics in inspecting the technical condition of an internal combustion engine with autoignition on the example of the Fiat drive unit with common rail system. As a result of measuring the sound pressure level for specific faults and comparing the noise generated by the motor running smoothly, the detailed maps of changes in the acoustic spectrum are possible to generate. These results may be helpful in the future diagnostics of internal combustion engines. In the paper, the results of scientific work in the area of research, design and operation of internal combustion engines, conducted at the Department of Automotive Engineering, in cooperation with the Laboratory of Hydraulic Drives & Vibroacoustics of Machines at the Wroclaw University of Technology are included.