Technical Transactions iss. 13. Environment Engineering iss. 1-Ś

Technical Transactions iss. 13. Environment Engineering iss. 1-Ś

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Collection items (16)


Utilisation of terrestrial laser scanning for verification of geometry of numerical models of hydrotechnical structures using the example of a section of the concrete Besko Dam

Zaczek-Peplinska, Janina, Popielski, Paweł
Article
2013
The paper presents results of utilisation of terrestrial laser scanning for verification of geometry of the numerical model of behaviour of Besko Dam, created on the basis of design data. Results of inventory measurements, performed in the period 2009–2011 with the use of laser scanning techniques are also presented. Changes in geometry of numerical models were introduced on the basis of performed measurements. Analysis, which aimed at determination whether the observed changes in shape influence the forecasting of behaviour of the structure. It has been stated that the applied technology of measurements is a useful tool for verification the model geometry, and, therefore, for checking the model correctness and increasing the reliability of obtained results.

Thermal aspects of filling gaps and loss in concrete pavement repair

Zając, Bogusław
Article
2013
The paper summarizes the thermal aspect of bonding between engineering materials of different coefficients of thermal expansion. In such connections, there are thermal stresses generated. They may cause relevant decay of the mechanical properties of the bond under normal service temperatures. The experimental results show relevant influence of the temperature on bond performance, especially on durability of bonding in relation to the work under elevated variable temperature. The right selection of materials allows for increasing durability of connections. Mechanical properties of polyurethanes are stable in a wide temperature range over their glass transition temperature (occurring below –30°C), in opposite to epoxy resins, which glass transition temperature can be located in the range of environmental temperatures.

Supervised classification of laser scanning data in the assessment of technical conditions of masonry constructions

Toś, Cezary
Article
2013
In the paper is presented the application of supervised classification to determine the technical conditions of masonry structures. The supervised classification of the registered intensity of laser beam reflection and images from a digital camera are tested to detect dampness, salt stamps and vegetation cover on the surface of the retaining wall of levees. The analyses are referred to two clouds of points obtained with the use of two types of laser scanners which are using different wavelengths. In both cases, the intensity of reflections improved the results of supervised classification.

Comparison of slope stability predictions by gravity increase and shear strength reduction methods

Sternik, Krzysztof
Article
2013
The finite element method has become the most widespread method of analyzing slope stability. Its advantage over the limit equilibrium method (the method of slices) has been proven in many publications. The most commonly applied FEM computational scheme in slope stability calculations is the shear strength reduction (SSR) method. Another way of analysing slope stability by FEM is the gravity increase (GI) method. The latter method may not be applied unconditionally. The paper contains a comparison of results obtained by the SSR, GI and modified Bishop’s methods. A good agreement of the results produced by the SSR and the modified Bishop’s methods has been confirmed. Overestimation of the safety factor by the GI method in the case of using the linear Mohr-Coulomb criterion has been shown.

Implementation of low pressure injection for soil reinforcement and sealing – selected application

Słowikowski, Daniel, Kacprzak, Grzegorz
Article
2013
The paper summarizes the practical aspects of the application of low pressure injection (grouting) for soil hydroinsulation and stabilization. Technical aspects of low pressure injection application and requirements dedicated to soil binders have been described. The paper also contains characteristics of selected investment where low pressure injection technology has been applied.

Application of numerical methods in the design and analysis of fish pass efficiency

Puzdrowska, Marta
Article
2013
The paper summarizes the examples of numerical computational methods to analyze the efficiency of fish passes. Numerical simulations were performed using the commercial software Flow 3D. The examples refer to the 2 types of construction of the device: Vertical Slot Fishways and Bolt Fishways.

The application of geophysical methods and numerical modeling for the evaluation of embankment technical conditions

Popielski, Paweł, Kowalczyk, Sebastian, Mieszkowski, Radosław, Chadaj, Marek, Krysiak, Michał, Smoliński, Błażej
Article
2013
The paper focuses on selected geophysical methods, which may be applied for the evaluation of the technical conditions of flood banks. The paper presents and discusses results of geophysical tests (refractive seismic, geo-radar, vertical electrical sounding and electrical resistivity tomography) obtained from the Kobylnica research test site, i.e. for parts of flood banks on the Vistula River in the Mazovia Region. For a part of the flood bank, where geophysical anomalies were presented, and where cones of hydraulic leakages were observed, numerical calculations of the filtration processes (suffosion) were performed. The obtained results of the geophysical investigations were compared with geotechnical investigations.

Application of the filtration numerical model for the assessment of the effectiveness cut off walls in levees

Mirosław-Świątek, Dorota, Merkel, Maria, Giżyński, Witold
Article
2013
In this paper, a two-dimensional numerical model of filtration was used to evaluate the effectiveness of cut off walls constructed in DSM and WIPS technology. Numerical calculations were performed for a steady state water flow through the body and the base of the levee. On the basis of these simulations results, an assessment of the effectiveness of these cut off walls was made.

Numerical analysis of a polymer flexible joint in a tensile test

Kisiel, Paweł, Kwiecień, Arkadiusz
Article
2013
The paper presents an analysis of Polymer Flexible Joint behaviour in a tensile test. Three Finite Element Method models have been developed in order to compare numerical and laboratory test results. A discrepancy between laboratory test results and computational results obtained in models based on material parameters derived from polymer dumbbell test has been shown. This work also presents the influence of the choice of hyperelastic material model on calculations accuracy in Polymer Flexible Joint analysis.

Research on the influence of the applied stone column formation method on the consolidation time of the surrounding soil

Kanty, Piotr
Article
2013
Dynamic replacement (DR) and vibro replacement (VR) are the most common methods of stone column formation applied in Poland. A stone column acting as a drain is considered as a method of speeding up the soil consolidation process. However, the influence of the column formation process itself on the consolidation time is unknown. Dynamic effects as well as the destruction of soil structure taking place during DR column formation may extend the time of soil consolidation in comparison to less invasive methods, like vibro replacement. To verify this thesis, laboratory model tests of three VR columns and three DR columns were conducted at the geometric scale 1:40. Weak soil was imitated with very soft clay and the column material – with gravel. In order to identify phenomena occurring during the investigation, the clay itself was tested as well and FEM was applied. The initial parameters used in the numerical analyses were taken from standard laboratory tests.