The article presents partial results of laboratory research into physical and mechanical characte... more The article presents partial results of laboratory research into physical and mechanical characteristics of materials most commonly used as walling units in masonry structures of historic and heritage buildings. Core boreholes and specimens for the laboratory research of selected characteristics were sampled from accessible places of historic buildings, which had not been restored or reconstructed.The results of the research brought new knowledge about the unreliability (variance) of the properties of historical, mainly natural building materials, and, at the same time, pointed out the need for further research and extension of knowledge necessary for the assessment of residual physical and mechanical characteristics of historic masonry structures.
Paper deals with the comprehensive methodology for the numerical simulation of potentially unstab... more Paper deals with the comprehensive methodology for the numerical simulation of potentially unstable slopes combining engineering geological, hydrological, hydrogeological and geotechnical computational model for the assessment of slope stability. Engineering geological model based on available survey data characterizes the rock environment using individual quasi-homogenous units. Model is defined on the basis of documented lithostratigraphic units in exploration probes and field relief documented by advanced methods, including satellite radar interferometry and laser surface scanning. On the basis of engineering geological model, the hydrological model using MIKE SHE software (Finite Difference Method) was performed. Hydrological model includes simulation of surface runoff, evapotranspiration and flow in unsaturated near-surface zone. The model was calibrated on the basis of available field data. Outputs from this model were used as input initial conditions of the following hydrogeo...
Civil engineering works carried out as the renovation of existing buildings can be difficult to p... more Civil engineering works carried out as the renovation of existing buildings can be difficult to predict in terms of their behaviour over time. The heterogeneity of materials of a natural and anthropogenic origin can subsequently lead to either deformations, or breach threatening the existence of building structure in terms of statics. The platform of the station in Jilešovice underwent structural modifications within the reconstruction of the railway track from Ostrava to Opava. The largest building intervention was the reconstruction of an old bridge and adjacent embankment bodies now in addition secured due to stability by gabion baskets instead of the original natural grading. After a short time of its use, significant deformations appeared on the renovated object, whose causes and further evolution over time was not known. Within the design of investigation techniques, allowing uncovering the causes of violation quickly and efficiently, the survey with a georadar -GPR (Ground Pe...
Sandstone is the rock type most widely used for building and ornamental purposes in the Moravian ... more Sandstone is the rock type most widely used for building and ornamental purposes in the Moravian and Silesian regions. Many types of Cretaceous sandstone have been used for construction throughout history, most of which come from numerous small quarries along the south-eastern margin of the Bohemian Cretaceous Basin and the Outer Carpathian nappes (Silesian Unit). However, production currently continues only at the Řeka locality (Outer Carpathians). The Bohemian Cretaceous sandstones that have been surveyed are quartzose with high proportions of SiO2 and low alkalies. The Outer Carpathian sandstones are glauconitic, with local calcareous cement, and higher proportions of Al2O3 and alkalies. The Bohemian Cretaceous sandstones are the more mature of the two. Furthermore, the physical properties of the sandstones from these two regions differ significantly, with those of the Bohemian Cretaceous Basin showing lower bulk density, compressive strength and frost resistance, and higher poro...
V soucasne době se v ramci vyssiho využivani obnovitelných zdrojů energie zvysuje množstvi instal... more V soucasne době se v ramci vyssiho využivani obnovitelných zdrojů energie zvysuje množstvi instalovaných tepelných cerpadel pro vytapěni objektů a připravu teple užitkove vody a spolu s tim i množstvi tepelných výměniků vybudovaných v horninovem prostředi. Výsledky přesně provedene analýzy horninoveho prostředi, v němž ma být vrtaný tepelný výměnik vybudovan, jsou zasadnim podkladem v procesu projektovani. V řadě připadů je instalace vrtaných tepelných výměniků realizovana pouze na zakladě zkusenosti projektanta a mohla by být optimalizovana. V clanku je popsan spravný postup analýzy horninoveho masivu a diskutovany problemy, ktere při jeho nedodrženi mohou nastat.
The objective of the presented study is to assess the evolving mine water quality of uranium mine... more The objective of the presented study is to assess the evolving mine water quality of uranium mines abandoned between 1958 and 1992 in the Czech Re-public. The sampling proved that actual uranium concentrations in mine waters did not in most cases exceed 0.45 mg/L. Uranium concentrations in the discharges from the adits abandoned more than 40 years ago were below MCL of US EPA for drinking water. Special attention is given to the most recently abandoned Mine Olsi. Upon the geochemical modelling results using Geochemist’s Workbench, three time phases of mine water evolution can be defined at this deposit.
The survey of damaged engineering buildings is in many cases very demanding in terms of the selec... more The survey of damaged engineering buildings is in many cases very demanding in terms of the selection of a right exploration method in relation to the results obtained for subsequent engineering works, time for survey implementation, and violations arising from survey activities. Heterogeneity of materials of a natural and anthropogenic origin is a fundamental axiom which can subsequently lead to either a distortion or a failure threatening statically the existence of a building structure. On the test object of a pavement, after some time of its use, severe deformations became evident whose causes and future evolution were not known. Within the design of survey techniques being able to quickly and efficiently uncover the causes of failures, the GPR (Ground Penetrating Radar) investigation was included which as an indirect, non-destructive survey method very quickly helped to clarify he causes of failures of the building structure.
The article presents partial results of laboratory research into physical and mechanical characte... more The article presents partial results of laboratory research into physical and mechanical characteristics of materials most commonly used as walling units in masonry structures of historic and heritage buildings. Core boreholes and specimens for the laboratory research of selected characteristics were sampled from accessible places of historic buildings, which had not been restored or reconstructed.The results of the research brought new knowledge about the unreliability (variance) of the properties of historical, mainly natural building materials, and, at the same time, pointed out the need for further research and extension of knowledge necessary for the assessment of residual physical and mechanical characteristics of historic masonry structures.
Paper deals with the comprehensive methodology for the numerical simulation of potentially unstab... more Paper deals with the comprehensive methodology for the numerical simulation of potentially unstable slopes combining engineering geological, hydrological, hydrogeological and geotechnical computational model for the assessment of slope stability. Engineering geological model based on available survey data characterizes the rock environment using individual quasi-homogenous units. Model is defined on the basis of documented lithostratigraphic units in exploration probes and field relief documented by advanced methods, including satellite radar interferometry and laser surface scanning. On the basis of engineering geological model, the hydrological model using MIKE SHE software (Finite Difference Method) was performed. Hydrological model includes simulation of surface runoff, evapotranspiration and flow in unsaturated near-surface zone. The model was calibrated on the basis of available field data. Outputs from this model were used as input initial conditions of the following hydrogeo...
Civil engineering works carried out as the renovation of existing buildings can be difficult to p... more Civil engineering works carried out as the renovation of existing buildings can be difficult to predict in terms of their behaviour over time. The heterogeneity of materials of a natural and anthropogenic origin can subsequently lead to either deformations, or breach threatening the existence of building structure in terms of statics. The platform of the station in Jilešovice underwent structural modifications within the reconstruction of the railway track from Ostrava to Opava. The largest building intervention was the reconstruction of an old bridge and adjacent embankment bodies now in addition secured due to stability by gabion baskets instead of the original natural grading. After a short time of its use, significant deformations appeared on the renovated object, whose causes and further evolution over time was not known. Within the design of investigation techniques, allowing uncovering the causes of violation quickly and efficiently, the survey with a georadar -GPR (Ground Pe...
Sandstone is the rock type most widely used for building and ornamental purposes in the Moravian ... more Sandstone is the rock type most widely used for building and ornamental purposes in the Moravian and Silesian regions. Many types of Cretaceous sandstone have been used for construction throughout history, most of which come from numerous small quarries along the south-eastern margin of the Bohemian Cretaceous Basin and the Outer Carpathian nappes (Silesian Unit). However, production currently continues only at the Řeka locality (Outer Carpathians). The Bohemian Cretaceous sandstones that have been surveyed are quartzose with high proportions of SiO2 and low alkalies. The Outer Carpathian sandstones are glauconitic, with local calcareous cement, and higher proportions of Al2O3 and alkalies. The Bohemian Cretaceous sandstones are the more mature of the two. Furthermore, the physical properties of the sandstones from these two regions differ significantly, with those of the Bohemian Cretaceous Basin showing lower bulk density, compressive strength and frost resistance, and higher poro...
V soucasne době se v ramci vyssiho využivani obnovitelných zdrojů energie zvysuje množstvi instal... more V soucasne době se v ramci vyssiho využivani obnovitelných zdrojů energie zvysuje množstvi instalovaných tepelných cerpadel pro vytapěni objektů a připravu teple užitkove vody a spolu s tim i množstvi tepelných výměniků vybudovaných v horninovem prostředi. Výsledky přesně provedene analýzy horninoveho prostředi, v němž ma být vrtaný tepelný výměnik vybudovan, jsou zasadnim podkladem v procesu projektovani. V řadě připadů je instalace vrtaných tepelných výměniků realizovana pouze na zakladě zkusenosti projektanta a mohla by být optimalizovana. V clanku je popsan spravný postup analýzy horninoveho masivu a diskutovany problemy, ktere při jeho nedodrženi mohou nastat.
The objective of the presented study is to assess the evolving mine water quality of uranium mine... more The objective of the presented study is to assess the evolving mine water quality of uranium mines abandoned between 1958 and 1992 in the Czech Re-public. The sampling proved that actual uranium concentrations in mine waters did not in most cases exceed 0.45 mg/L. Uranium concentrations in the discharges from the adits abandoned more than 40 years ago were below MCL of US EPA for drinking water. Special attention is given to the most recently abandoned Mine Olsi. Upon the geochemical modelling results using Geochemist’s Workbench, three time phases of mine water evolution can be defined at this deposit.
The survey of damaged engineering buildings is in many cases very demanding in terms of the selec... more The survey of damaged engineering buildings is in many cases very demanding in terms of the selection of a right exploration method in relation to the results obtained for subsequent engineering works, time for survey implementation, and violations arising from survey activities. Heterogeneity of materials of a natural and anthropogenic origin is a fundamental axiom which can subsequently lead to either a distortion or a failure threatening statically the existence of a building structure. On the test object of a pavement, after some time of its use, severe deformations became evident whose causes and future evolution were not known. Within the design of survey techniques being able to quickly and efficiently uncover the causes of failures, the GPR (Ground Penetrating Radar) investigation was included which as an indirect, non-destructive survey method very quickly helped to clarify he causes of failures of the building structure.
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