An approach to risk evaluation against the failure of waste deposit sealing layer is given. It is derived from experience gathered with municipal waste deposit closures. Such deposits were monitored in Ce ntral Bohemia in the territory of the Czech Republic. Geodetic observations on such deposits carried out for five to eleven years provided a chance to obtain and interpret continuous deformation data series. Results can increase functional reliability of their superficial sealing and can be used to optimise the time when closure and recultivation should start. The results concern superficial settlement, its development in time and irregularities that are practically very important. Definition of failure criteria that would allow evaluation of limits in irregular deposit se ttlement is relatively difficult and should become a topic for further investigations and discussions., Zdeněk Kudrna., and Obsahuje bibliografické odkazy
In the article the results of repeated satellite positional measurements of station VYHL of the Sněžník Network over period 1994-2006 are presented. Altogether 17 Brno University of Technology measuring campaigns were carried out and evaluated. The observation data (acquired mostly with Leica GPS receivers) were processed with the scientific Bernese GPS Software and the commercial Leica SKI-Pro software packets. Unified procedure for campaign data processing including the alignement of the resulting positions to respective EUREF Permanent Network weekly solutions had been adopted. Only the stability in horizontal direction was analysed. Positional stability of the VYHL station was considered in respect to the surrounding IGS, EPN, and local stations which were used for a local reference frame definitions, at three different levels. First level information was obtained from relations to surrounding stations of the Sněžník Network in distances up to 10 km, second level represent the relations to nearest EPN stations in distances about 100 km, and finally third level represent the relations to surrounding IGS Network stations in distances about 300 - 400 km. Another approach to VYHL stability assessment was the an alysis of slope distances time series from VYHL to neighbouring GPS stations. Outlined are also possibilities of exploitation of the recently completed CZEPOS Network., Otakar Švábenský and Josef Weigel., and Obsahuje bibliografické odkazy
In this paper, results from the long-term monitoring of two deep-seated slope deformations are presented. These deformations are considered typical of the types of landslide that occur in the high mountains of the Western Carpathians. The localities are situated in similar geological settings and this has enabled direct comparison of their development over the past 30 years. The monitoring has been undertaken using the extensometric gauges, TM71. At the Parohy Site, results from the scarp area show a significant vertical displacement trend of 0.07 mm per year. At the Štrochy Site, results from the crown area show a horizontal crack opening trend of 0.015 mm per year. Monitoring is ongoing at both sites., Miloš Briestenský, Blahoslav Košťák, Josef Stemberk and Jozef Vozár., and Obsahuje bibliografii
The static analyses and assessment of the technical condition of historical buildings in the Prague Castle Area are based on observational methods to gather the basic information about the behaviour of structures. The monitoring involves a combination of different methods of surveying, crack, inclination and temperature measurements together with the monitoring of dynamic effects of traffic and nearby tunnelling activities. These methods were enhanced by line-wise measurements using a high-precision sliding micrometer and inclinometer to assess the role of subsoil and to discover potential very slow slope movements in inclined parts of the area. The problems connected with long-term stability of historical buildings are further studied with the use of static analyses and numerical models of selected buildings in the area., Jaromír Procházka, Jan Záleský, Tomáš Jiřikovský and Jan Salák., and Obsahuje bibliografii
The article provides the results acquired during the development of a magnetic circuit equipped with magnetic blocks assembled from NdFeB magnets with gradually increasing height. It presents the knowledge from the application of the new method of assembling these blocks and the achieved values of maximum magnetic induction in dependence on the distance from the surface of the blocks both for their different heights and for the different designs of the magnetic circuit in comparison with the values obtained for similar magnetic circuits with ferrite magnets., Václav Žežulka., and Obsahuje bibliografii
A brittle tectonic study has been carried out in the crystalline limestone and granite quarries near Vápenná village in the Rychlebské hory Mts. in the NE part of the Bohemian Massif. The quarries are situated along the Sudetic Marginal fault zone - the most important tectonic structure of the area. At the lo cality, the Sudetic Marginal fault separates Devonian crystalline limestones of the Branná group and Paleozoic granites of the Žulová pluton. Hundreds of measurements of joints and small-scale faults were taken in three limestone quarries on the west side of the fault. Kinematic indicators were observed as well. Equivalent measurements and observations have been performed on the fault east side in several small granite quarries. In the limestones three sets of fault have been identified (the W-E subvertical, the Sudetic NW-SE falling 45° to NE and the N-S falling 75° to W). The W-E direction of faults is the most importa nt direction there. There are two sets of faults in the granites (the subvertical Moravo-Silesian NE-SW and the Sudetic NW-SE). The NE-SW direc tion is dominant. There are almost none subhorizontal faults in the studied area., Lucie Nováková., and Obsahuje bibliografické odkazy
The sustainable ecology belongs to the most important issues today. In this field a use of recycled materials is of great interest to people. Consequently, incorporation of industrial waste, concrete and brick scraps and other rubbish into products for civil engineering use is very important. Certain results from experiments carried out in laboratory on standard samples are emerged in this paper. Since the material is not yet enough approved, three main targets are addressed. The first involves the behaviour of fiber reinforced concrete based on aggregates from various recycled material. Then the influence of distance among two or more fibers is observed. For completeness the results from shear tests are presented in the end of this paper., Jiřina Trčková and Petr Procházka., and Obsahuje bibliografii