Górnictwo i Geoinżynieria
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ISSN 1732-6702
Issue Date
2009
Volume
R. 33
Number
Nr 1
Description
Journal Volume
Górnictwo i Geoinżynieria
R. 33 (2009)
Projects
Pages
Articles
Rozpoznanie i badanie podłoża gruntowego metodami polowymi w ujęciu Eurokodu 7
(Wydawnictwa AGH, 2009) Bagińska, Irena
The paper deals with new investigation procedures introduced in Eurocode 7. The idea of Eurocode Program as well a general characteristic of both Eurocode 7 parts is presented in the paper. The problems of planning, documentation as well as identification and investigation of soil ground by in situ methods are considered. The procedure of determination of design values of geotechnical properties is described. Some differences and similarities to other PN-EN codes already put into force are illustrated. The actual state of implementation of standard specifications EN and EN-ISO regarding in situ investigation is also presented.
Próba weryfikacji parametrów wytrzymałościowych odpadów powęglowych metodą granicznego stanu naprężenia
(Wydawnictwa AGH, 2009) Baran, Przemysław; Zawisza, Eugeniusz; Szymacha, Agata
The subject of the paper is verification strength parameters of colliery spoils. Angle of internal friction and cohesion have been obtain using a middle-size shear box apparatus as well as back analysis in conjunction with a laboratory model test. The strength parameters obtained from laboratory tests and calculations have been use in limit stress state analysis. The analysis has enabled to obtain a shape of slope and position of slip surface in limit state for two pairs of strength parameters. A comparison between the shapes calculated and the shape from model test, revealed the value of cohesion obtained using the shear box apparatus is half overstate.
Optymalizacja szerokości pasów ochronnych przy odkrywkowej eksploatacji kopalin pospolitych
(Wydawnictwa AGH, 2009) Batog, Andrzej; Hawrysz, Maciej
The paper presents the examples of protection area width optimization for the open pit mines for some engineering structures situated in contiguity of the open pit. The possibility of deposit exploitation from the part of protective pillars of power lines and aerial masts was demonstrated. The slope stability during exploitation and at final stage of open pit will be retained. The presented problem is particularly essential for the sand and gravel pits, which deposits are becoming exhausted.
Analiza przemieszczeń poprzecznie obciążonego pala w trójwymiarowym ośrodku liniowo-sprężystym o cechach losowych
(Wydawnictwa AGH, 2009) Bauer, Jerzy; Kozubal, Janusz; Puła, Wojciech; Wyjadłowski, Marek
The paper presents a probabilistic modelling of displacements of a foundation pile. The pile is subjected to lateral loading implemented in the pile's head. The pile is embedded in a layered linearly-elastic random medium. The loading is considered as a random variable. The probabilistic approach to this problem as a three-dimensional one constitutes a new result in comparison with other earlier published. The base of the solution is the three-dimensional modelling by the finite element method. A series of results can be obtained under various values of elastic characteristics of the medium under consideration. Next by a non-linear regression procedure a response surface is obtained. To get the final response surface an iterative algorithm has been applied. The final response surface allows a reliability analysis. The failure criterion is an exceeding of an allowable displacements threshold by deformed pile's head. By numerical examples a vital effect of the random variability of the lateral force as well as random variability of the elastic modulus of the upper layer has been demonstrated.
Dyskusja i kalibracja hipotezy Meyerhofa
(Wydawnictwa AGH, 2009) Brząkała, Włodzimierz; Blanc, Julien
The Meyerhof hypothesis deals with the bearing capacity of eccentrically loaded shallow foundations. It uses an effective foundation width thus addresses the bearing capacity calculation to the one for centrally loaded strip foundations of the reduced width. Testing elasto-plastic analyses based on the PLAXIS(R) code confirm good accuracy of such a simplification. In the second part, the paper focuses on partial safety factors proposed by the Eurocode EC7. A special attention is also paid to the role of random eccentricity. Making use of the Hasofer-Lind calibration, it is found that the values of partial safety factors proposed by EC7 are reasonable.