Darja Kubečková

Unique documentation, analysis of origin and development of an undrained depression in a subsidence basin caused by underground coal mining (Kozinec, Czech Republic)

Abstract This article aims to explain and demonstrate the origin and development of a subsidence basin caused by coal mining as well as to point out important aspects of this phenomenon in engineering geology. Engineering geology needs to deal with a number of issues related to the origin and development of subsidence basins in areas affected by deep coal mining. An interesting case study from the Upper-Silesian Basin in the northeast of the Czech Republic near the Polish border is presented in this paper. There is a clear time chronological succession in the ground surface changes manifested by a ground subsidence gradation, both in their absolute values as well as in their spatial distribution. The phenomenon is documented by aerial photo time series, which optimally depict the origin and development of the subsidence. In the study area, there are changes in the landscape elements and it is essential to be considered in future land use plans. The marginal conditions of the Quaternary geological structure and hydrogeological conditions are responsible for an unconfined aquifer which manifests there as a water body in an undrained depression in the course of the ground subsidence.

Airtightness of Energy Efficient Buildings

The paper deals with the energy performance of buildings with regard to the requirements of Directive 2010/31/EU of the European Parliament and of the Council of 19 May 2010 on the energy performance of buildings. One of the basic principles of energy efficient buildings is perfectly airtight envelope of buildings. Untightness leads to uncontrolled air exchange and increased heat loss. The objective of the paper is to characterize and analyze the airtightness of energy efficient buildings. The analysis is performed on a sample of measurements of energy efficient buildings in the Czech Republic. The sample consists of 50 new buildings built between 2007 and 2011. Each building of the sample fulfills requirements for reduced power consumption with regard to sustainable development.

The importance of quality of realization on airtightness ofbuilding envelope

The paper analyzes the significance of quality of execution and ongoing controls affecting the final airtightness of building envelope. The realization of building with well airtight building envelope must be more consistent and rigorous than the realization of conventional building. There are two ways to realization of energy - efficient buildings. On the one hand, there is a realization using a professional construction companies. On the other hand, it is a realization of the building themselves (self-build). The aim of the paper is to verify the statistical dependence of the final airtightness building envelope between the realizations using by professional construction companies and self-build.

Diagnostics of Current Developments in the Field of Building Airtightness

One of the basic principles of energy efficient buildings in accordance with sustainable development is perfectly airtight building envelope. Oversized heat loss through the building envelope leakage adversely affects the energy balance of buildings. The paper provides diagnostic of the recent developments in airtightness of buildings using qualitative method. The aim of this paper is to draw conclusions - dependences, definitions of weak and strong points of the process, their causes and consequences.

Assessment and Damage for Building Structures Risk Analysis Methods

The paper introduces an alternative method for damage pricing on buildings in consequence of defects, failures and collapses. The method operates with time-independent price of the structure and following damage on the construction. Using risk analysis methods, the price is reduced depending on technical condition to proper damage and evaluation of the object, building or structure.

Influence of Building Materials on Building Airtightness

The aim of the contribution is to confirm or rule, by using non-parametric Kruskal Wallis test, the hypothesis published [1] that the construction type and building materials have not statistically relevant effect on the final building airtightness. For non-parametric test is used the same sample as in [1], where the impact of construction type on the airtightness is refused by using parametric test - one way analysis of variance (ANOVA).

The Influence of Additional Insulation of Facades to their Aesthetic Devaluation by Vegetation of Algae, Fungi and Cyanobacteria

The purpose of the facade insulation is to reduce transmission heat loss from the heated interior to exterior. After some time, it can be said that the insulation of the building envelope served its purpose and significantly reduce heat use for heating of insulated buildings. Time, however, showed the risks of external thermal insulation composite system (ETICS). One side effect of reducing transmission heat loss of buildings by using of ETICS can be considerable aesthetic devaluation of facades. Sometimes façade with ETICS become a suitable substrate for the growth of microorganisms. These are algae, fungi and cyanobacteria, which creates unsightly green and black growths on facades. The article deals with the connection between thermal insulation of external walls and the presence of vegetation microorganisms.

Incidence of Microorganisms on Insulated Facades in the Selected Location (Ostrava-Poruba)

Incidence of microorganisms on thermal-insulated facades in the selected location (Ostrava-Poruba). Incidence of microorganisms on facades is more and more common. It benefits mostly from façade´s thermal insulation. This problem is not only esthetical. Incidence of microscopic fungi increased due to environmental changes. Every person is breathing spores (reproductive particles of mould) unknowingly. There is evidence that spores are closely related to respiratory illnesses. Objects that are vulnerable to microorganisms should be managed in a way, where there is no risk of harm to us or people around us.

Influence of the Installation Lines to the Acoustic Properties of Dividing Wall

This article presents the results of long-term research of airborne sound insulation of a dividing wall. Specifically it shows how strong effect on the acoustic properties of the dividing walls has the line installation of technical equipment of building. The experimental structure was built from shaped hollow bricks where the influence of structural damage is in terms of the noise propagation essential. This type of structure was selected because it is one of the most commonly used structural systems and the acoustic properties are still neglected aspect.

The Statistical Verification of Significance of Airtightness and Energy Performance

The main objective of the paper is to confirm or exclude a statistically significant impact of airtightness on the energy performance of buildings. Energy performance of buildings is characterized by a specific energy demand for heating and specific total primary energy. Airtightness is one of the key factors of energy efficient buildings. The quality of airtight building envelope except for low energy consumption also minimizes the risk of damage to the structure associated with the spread of the heat and water vapor in the structure.