Górnictwo i Geoinżynieria
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ISSN 1732-6702
Issue Date
2011
Volume
R. 35
Number
Nr 1
Description
Journal Volume
Górnictwo i Geoinżynieria
R. 35 (2011)
Projects
Pages
Articles
Geomechaniczny model ośrodka transwersalnie izotropowego jako uproszczony model górotworu uwarstwionego
(Wydawnictwa AGH, 2011) Burtan, Zbigniew
In consideration of real properties of rock mass built of several strata differing in their strain-related parameters, the gemechanical model of rock strata seems a good solution to be used in analytical studies of mining impacts. On the other hand, the formulas governing such model are most complex, besides, not all strain parameters are available during the mining operations, so underlying mining forecasting are simplified models of rock strata based on the models of a transversely isotropic medium. The author suggests how to represent isotropic strata underlying the level being mined by a single, transversely isotropic stratum. These principles together with precisely controlled boundary conditions allow for finding the state of stress and displacement at an arbitrary point in the analysed rock medium, represented by the transversely isotropic medium.
Zabezpieczanie górniczo-budowlane obiektów archeologicznych w Egipcie w aspekcie dalszej ich eksploracji
(Wydawnictwa AGH, 2011) Ciałowicz, Krzysztof Marek; Chmura, Janusz; Lasoń, Andrzej; Mikoś, Tadeusz; Pawlikowski, Maciej; Tajduś, Antoni
Archeological, geologic and mining research performed on a pre-dynastic mastaba, which dates 5 thousand years back, indicates the presence of some archeological layers under the object. Throughout the centuries the foundations and the walls have been destroyed by rains and flooding from the Nile. This destructive influence of moisture and the weight of the building itself have caused local deformations of bricks, binder and the walls. The preliminary mining project aims at detailed recognition and research of the base and the walls of the mastaba. Further steps include direct exploration of the anthropogenic layer, placed under the walls. The application of mining methods guarantees the stability of the historical walls of the mastaba without any deformations. After this exploration, it will be possible to replace this space with the material that would protect the stability of the preserved walls of the mastaba. In the future, this can be the basis for contemporary reconstructions of this incredibly valuable relic.
Metoda planowania i kontrolowania realizacji przedsięwzięć budowlanych: studium przypadku
(Wydawnictwa AGH, 2011) Czarnigowska, Agata; Sobotka, Anna
It is quite common that in the course of construction works their programmes (both schedules and cost plans) have to be adjusted to changing conditions. If plans are to be met, it is thus necessary to monitor performance to introduce necessary repair actions. Progress checks providing information useful in project control should be conducted on regular basis. The aim of the paper is to present a method used for managing projects on operations level- the Earned Value method (EV) and its extension - Earned Schedule (ES). In these methods, a set of simple indices allow the project manager to decide on further progress of works. Application of the method has been illustrated by a road works case study.
Transport wody rurociągami szybowymi w instalacjach chłodzenia powietrza w podziemnych wyrobiskach górniczych
(Wydawnictwa AGH, 2011) Filek, Krzysztof
A control of thermal hazard in underground mines is connected with cooling equipment utilization, Heat received from cooled air in excavations can be used on a surface. This article applies to problem of warm water transport from mine, with special consideration its pressure and temperature. The algebric equations of pressure distribution were shown and differential equations of temperature distribution in water lines were derived. Two numerical examples, which represented discussed problem, were solved - their results were presented in form of diagrams in two pictures.
Ocena jakości pracy chłodziarki TS300 z wykorzystaniem statystycznej analizy danych
(Wydawnictwa AGH, 2011) Łuczak, Rafał
In the article, an analysis of air parameter validation, which is cooled by direct action cooler type TS300, made by Termospec Ltd., and influence of air parameters on a process of its cooling and refrigerating power of applied cooler were presented. A cooling efficiency was evaluated by statistical criteria in the form of multiple regression equations. In this work a statistical analysis of air and water parameters was shown and on this basis an estimation of evaporator and condenser input data was made. An application of obtained statistical equations allows in the simply and fast manner determine the cooled air parameters and makes possible to realize a simulation of evaporator and condenser powers in the relationship to input data validation in the places of forecast refrigerator localization.