Jan Štefaňák | Brno University of Technology (original) (raw)

Springer series in geomechanics and geoengineering, 2024

Master´s Thesis describes the realization setup procedure of factory building in Rokycany. Buildi... more Master´s Thesis describes the realization setup procedure of factory building in Rokycany. Building has precast concrete skeleton based on in-situ concrete piles. Document consists of concept of site accommodation, sizing of building machines, time schedule, technological rules and constraints for the chosen technological processes and plan of workplace safety and health

Springer series in geomechanics and geoengineering, 2024

Sustainability

There are still many unmanaged landfills around the world that pose significant potential environ... more There are still many unmanaged landfills around the world that pose significant potential environmental problems. One of the largest unmanaged landfills in Europe, which has been used for more than 40 years to deposit waste from Serbia’s capital, Belgrade, is the Vinča landfill. A revitalization and extension of this landfill was proposed that would allow its sustainable operation in the future. The revitalization project considered building a capping layer on the surface of the current landfill, which will close it and which will serve as a liner on the bottom of the new landfill. The use of a composite system including a HDPE geomembrane is considered in the project. New landfill settlements were predicted using the FEM method utilizing a Hardening-soil constitutive model for subgrade. Both immediate settlements of subgrade caused by waste deposition and primary consolidation settlement were calculated. The results show that a substantial increase in the settlement of the geomembr...

The objective of dissertation is to find the approaches for processing the data extracted from th... more The objective of dissertation is to find the approaches for processing the data extracted from the reports that document the performing of acceptance tests of ground anchors. The purpose of this activity is to allow further utilization of this data for designing practice. 795 test records were collected. It is essential for the correctness of analysis, that the whole anchor bond must be placed in homogeneous material. The records for anchors that don’t fulfilled this condition were removed. The set of 379 records of anchors installed in six different soil types during construction work in Czech Republic remained. All those anchors were tested according the demands of european standard ČSN EN 1537:2001, valid until 2013. The methodics based on the mathematical statistics, regression analysis and probability methods were compiled during solving the task defined above. The major result of data processing that was performed via methodics based on combination of mathematical statistics a...

SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings, 2019

Critical Thinking in the Sustainable Rehabilitation and Risk Management of the Built Environment, 2020

Acta Polytechnica CTU Proceedings, 2022

Progressive settlement of the embankment under the railway track near Žďár nad Sázavou, the Czech... more Progressive settlement of the embankment under the railway track near Žďár nad Sázavou, the Czech Republic, has been observed for many years. Immediate improvement was needed to secure the safety of the traffic and to increase the travel speed of the track. The reconstruction work consisted of deep soil mixing. Also, a load spreading geocell reinforced mattress was designed. The evaluation of the proposed solution by means of numerical modelling and associated laboratory testing is described in the paper.

SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings, 2017

SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings, 2019

Long-term life of tunnel structures within the transport infrastructure is expected to a return o... more Long-term life of tunnel structures within the transport infrastructure is expected to a return of higher investment for construction. Structure of tunnel lining can be exposed to negative influences of ground water etc., which cause degradation of used materials during this long period of time. Reduction of bearing capacity is the result, which in the critical case may cause the collapse of whole structure. Thus, it is advisable to know response of the weakened structure in order to identify the negative trends in its behaviour early and to proceed with remediation. Consequences of lining degradation can be analysed, for example, by FEM (Finite Elements Method) modelling of tunnel. Analysis of utility tunnel in Brno in Czech Republic is presented in this paper as an example. The modelling dealt with the simulation of the construction process for determining the current stress conditions around the tunnel. Further, detailed modelling of sprayed concrete lining using an advanced mate...

15th International Multidisciplinary Scientific GeoConference SGEM2015, SCIENCE AND TECHNOLOGIES IN GEOLOGY, EXPLORATION AND MINING, 2011

Stavební obzor - Civil Engineering Journal, 2019

The contribution is focused on investigation of strains in a rock specimen during uniaxial compre... more The contribution is focused on investigation of strains in a rock specimen during uniaxial compression test. Three components of strain occur in cylindrical shape specimen: axial, radial and volumetric. Determination of the strains is possible by using of local sensors. Strain gauges fixed on specimen surface were used in this study. Axial and radial components of strain were measured directly, and volumetric strain was calculated. Two types of rock were tested, syenite and sandstone, to illustrate variability of strain behaviour of rocks. Strain measurement is necessary for determination of Young's modulus and Poisson's ratio. Moreover, early states of failure can be identified by volumetric strain which is considerably sensitive to failure states.

Materials, 2019

Wood has a long tradition of use as a building material due its properties and availability. Howe... more Wood has a long tradition of use as a building material due its properties and availability. However, it is very sensitive to moisture. Wood components of building structures basically require a certain level of moisture protection, and thus moisture monitoring to ensure the serviceability of such components during their whole lifespan while integrated within buildings is relevant to this area. The aim of this study is to investigate two moisture monitoring techniques promoting moisture safety in wood-based buildings (i.e., new structures, as well as renovated and protected buildings). The study is focused on the comparison of two electrical methods that can be employed for the nondestructive moisture monitoring of wood components integrated in the structures of buildings. The main principle of the two presented methods of the moisture measurement by electric resistance is based on a simple resistor–capacitor (RC) circuit system improved with ICM7555 chip and integrator circuit usin...

Journal of Civil Engineering and Management, 2018

A variety of engineering activities require reliable evaluation of rock strength. For instance, t... more A variety of engineering activities require reliable evaluation of rock strength. For instance, the stability of rock slopes depends on structural geology of rock massif in which the slope is excavated. Hoek-Brown (HB) failure criterion applied in rock design practice introduces factors based on the properties of jointed rock. The non-linear finite element safety calculation is conveniently used for calculation safety the factor of slope stability. The Mohr-Coulomb (MC) failure (strength) criterion for soil is widely applied in geotechnical design. Therefore, the appropriate transformation from HB to the equivalent MC, employing angle of shearing resistance φ and cohesion c, is necessary. This article studies the effect of jointed rock massif properties on the transformed MC parameters by using Sobol’s global sensitivity analysis (SSA) and HB transformation equations. Statistical parameters needed for the evaluation of sensitivity analysis are processed using classical statistical m...