Rock Slopes as Engineering Constructions

The civil engineer and the geologist are very much concerned with rock slopes because they may be called upon to build and maintain safe, economical and useful structures even on hasardous ground. Such a task requires not only proficiency and a thorough understanding of the factors involved, but also intuition and experience. It should not be thought, however, that there is always a feasible solution or if there is one it should be pushed through at all cost

Foundation and Solidity Survey of the Monument Trianon Cross on the Ság Hill

In connection with the landscape architecture of the abandoned basalt quarry on the Ság hill, it was necessary to check the solidity and foundation conditions of the monument standing there. The report expounds the results of the survey and makes proposals concerning the necessary tasks

Compressive load bearing and bone architecture of lumbar vertebrae in terms of sex and aging

Relation between vertebral compressive strength and trabecular architecture is presented in terms of aging and sex. Complex in vitro medical-engineering analysis of cadaver human lumbar L1 and L2 vertebrae was executed: densitometry, CT, MRI, mechanical test and histology, in aspect of osteoporosis. In this paper the results of the mechanical test are detailed only. The compressive mechanical parameters, like limit stress and strain, proportional stress and strain, Young modulus, ductility, energy absorption capacity were determined. Morphometry analysis was based on the CT pictures. Density and diameter of trabeculae were measured. Correlation between morphometric and mechanical properties was evaluated in terms of aging, sex and bone mineral density

EVALUATION OF THE CREEP OF ROCKS ON THE BASIS OF RHEOLOGICAL MATERIAL MODEL

The paper shows a possible method for the evaluation of creep experiments carried out in the rock-physical laboratory of the Department of Mineralogy and Geology of the Budapest Technical University, by which the rheological material characteristics needed for the dimensioning of constructions in rock environments built of elastic rocks can be determined

Regional-Scale Assessment of the Climatic Role of Forests Under Future Climate Conditions

Diseases & disorder

Testing of Hungarian aggregates for railway ballast according to MSZ EN 13450: 2003

Abstract In June 2003 Hungary accepted the European Standard for Aggregates for Railway Ballast (MSZ EN 13450: 2003). The European norm, compared with the Hungarian Standard, also includes a new examination method called the micro-Deval method for railway ballast aggregates, which was previously not used in Hungary. This paper presents the test results of aggregates for railway ballast-producing quarries, according to newly accepted Standard. The test materials consist of andesite, basalt, dolomite and limestone. The results cover a significant range. The study was aimed at finding a relation between the testing methods, in order to reduce the testing procedure; however, no clear relationship was found

Chapter Regional-Scale Assessment of the Climatic Role of Forests Under Future Climate Conditions

Diseases & disorder

River - Groundwater Interaction over the Region of INFOPARK-Budapest

The region around the former Kopaszi-sandbank, a shallow, degraded part of the river Danube is now a dynamically developing district of the capital with a campus and the so-called INFOPARK. As the area itself was filled with various type of material during the last century, due to the prescription of the environmental authority regular control of the water quality parameters is introduced. Several groups of observation well were set to for the monthly observation of water quality parameters and the groundwater levels, as well. These levels are influenced by natural processes like the regime of the river or the precipitation, and by the buildings with foundations reaching the aquifer. The aim of this study is to show the interaction between the river and groundwater levels with special respect to the effects of buildings with deep foundations

HOW DOES THE WATER SATURATION INFLUENCE THE MECHANICAL PROPERTIES OF THE VOLCANIC TUFFS?

Different Hungarian volcanic tuffs (andesite tuffs, basalt tuffs and rhyolite tuffs) were investigated with the goal to determine the influence of the water content on their strength. The following petrophysical constants were measured for all the samples both in dry and saturated conditions: bulk density, ultrasonic wave velocity, uniaxial compressive strength (UCS) and Young´s modulus. The destruction work (strain energy) was calculated from the measured stress-strain curves, as well. The influence of the water for the UCS, impedance (scalar of the density and the ultrasonic wave velocity) and the destruction work is shown. In these cases linear relationship can be written between the dry and the saturated constants. Both linear and power equations can be used for the effect of the water on Young´s modulus. Finally the UCS is written as the function of the density and the impedance