Frydrych, Kornel
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Item type:Article, Access status: Open Access , Metoda sprawdzania podatności obudowy powłokowej(2007) Wichur, Andrzej; Bajorek, Marek; Frydrych, KornelOne of the elements of designing shell lining is checking its flexibility, which consists in demonstrating that the structural flexibility of the lining is greater than the forced rock mass shifts. The paper shows that the numerical factor 0,9 presented in the formula (21) of the standard (PN-G-05600:1998) has a diversified value dependent on the mechanical parameters of the rock mass and the lining. The analysis has been carried out on the basis of the solution evolved in the paper [9], with the assumption of the elastic work of the lining and the rock mass. Calculations have been made for 8 kinds of rock mass, characterized by values of the rock-hardness factor according to Protodiakonov f= 1.5-5 and for 13 lining sections according to (PN-G-06010:1998) at the cross-sectional area in the inside diameter of the mine working ranging from 10 to 53 square meters. The results of the work confirm the stated assumptions. The value 0.9 given in the standard (PN-G-05600:1998) corresponds to the values of K obtained for the lining flexibility factor $k_{2}$ calculated with the formula (25). This is a case in which the lining flexibility factor constitutes around 60% of the rock mass flexibility factor.Item type:Article, Access status: Open Access , Badania porównawcze metod obliczania obciążeń obudowy wyrobisk korytarzowych niepoddanych działaniu wpływów eksploatacji górniczej(2007) Wichur, Andrzej; Frydrych, Kornel; Zięba, AgnieszkaThe development of underground construction technology in the post-war period in Poland caused the improvement of the technique of driving and lining underground workings, in particular the construction of underground dog heading linings. In order to compare these methods, calculations have been made for 27 analytical variants. The obtained large discrepancies among the calculated values result from the lack of verification of these calculation results with load measurements in situ. It can thus be inferred that sole calculation results cannot be relied upon: carrying out measurements in mine conditions is essential.Item type:Article, Access status: Open Access , Zasady doboru obudowy powłokowej(Wydawnictwa AGH, 2005) Wichur, Andrzej; Frydrych, Kornel; Strojek, DanielShell lining had been wider known in Poland during 70s of the previous century. A present standard concerning design of the shell lining presents the range of the lining usage in a very general manner. It is only confined to a few basic technical conditions which must be fulfilled in order to apply this type of lining. The aim of this study was to supplement this scope with an economical criterion, which facilitates the optimal selection of the lining construction. The carried out analysis of principles of the shell lining's selection was based on 144 projects for series of data, with application a.o. various geotechnical parameters of rock, depths of dog headings and three types of steel sets. The obtained results can be applied in the shell lining's design.Item type:Article, Access status: Open Access , Wpływ konstrukcji obudowy tunelu o przekroju kołowym na wartość współczynnika podatności podłoża(Wydawnictwa AGH, 2005) Frydrych, KornelThe existence of elastic passive rock mass pressure significantly increases the bearing capacity of lining, thus it is important to include its effect in calculating internal forces of lining in a tunnel. While designing the lining a designer faces a problem how the construction of this lining influences a value of a coefficient of subgrade reaction. This paper contains computational results of a coefficient of subgrade reaction C for various types of lining in tunnels with a circle cross-section. It has been shown how the construction of lining influences a value of this coefficient.Item type:Doctoral Dissertation, Access status: Open Access , Badania nad kształtowaniem się wartości współczynnika podatności podłoża dla celów obliczeń statycznych obudowy tuneli(Data obrony: 2012) Frydrych, Kornel
Wydział Górnictwa i GeoinżynieriiThe distinguishing feature of underground excavations lining (including tunnels) is that the lining shall cooperate with rock mass, i.e. on the lining and rock mass contact forms displacement, resulting in the existence of forces that operate in addition to actively pressure the rock mass. These forces are named elastic passive rock mass pressure. The existence of elastic passive rock mass pressure increases the bearing capacity of lining. In accordance with current standard (PN-G-05020:1997) the internal forces calculation must take into account its impact. The PhD thesis consists five chapters. The initial chapters provide an introduction to issues closely related to the subject that describes elastic passive rock mass pressure, the current state of knowledge and its practical application. In these chapters discuss the definition of elastic passive rock mass pressure and its participation in the design of foundations and lining of underground excavations. In the following paper presents results of preliminary study regarding influence of lining structure and irregular load on the value of modulus (coefficient) of subgrade reaction C on the circumference of a circular cross-section. The fourth chapter is an essential part of the dissertation. It presents the results of calculations of the impact of geotechnical conditions on the coefficient of the subgrade reaction value and distribution on the circumference of the excavation. Commonly used cross-sections in underground construction were analysed. The study was conducted for elliptical and circular cross-sections, assuming that the rock mass surrounding the excavation (tunnel) is elastic, isotropic, constant and homogeneous. The main calculations were made using Robot Structural Analysis software and additional calculations using Mathematica and MS Excel software. As a result of these studies introduced the concept of shape coefficient k. Using this coefficient determinates the value of modulus C for various geotechnical parameters. Proposed two engineering methods of calculating the coefficient of subgrade reaction: the method based on the graphs and method of polynomial approximation. The guidelines for determining the coefficient of sub-grade reaction are to facilitate the design of underground excavations lining.