Browsing by Subject "underground excavation"

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Access status: Open Access ,
Badania nad wpływem współczynnika podatności podłoża na nośność obudowy wyrobiska podziemnego
(Wydawnictwa AGH, 2008) Frydrych, Kornel
Distinguishing feature of the underground excavations' lining (including tunnels) is their cooperation with a rock mass i.e. displacement on the lining and rock mass contact causing the creation of the forces (elastic passive rock mass pressure) which act beside active rock mass pressure. This fact caused that is necessary to take it into consideration in static calculations. Used method has two faults: it doesn't take into consideration both lining structure influence on the value of the coefficient of subgrade reaction and the variation of this coefficient value connected with the changing of the excavation radius in the breakthrough. The paper presents elastic passive rock mass pressure influence on designed distance of steel arch support. The lining structure influence on the elastic passive rock mass pressure value was also discussed.
Access status: Open Access ,
Rozwarstwienie stropu w wyniku eksploatacji systemem komorowo-filarowym z ugięciem stropu złoża rud miedzi w LGOM
(Wydawnictwa AGH, 2005) Wosz, Ryszard Józef
The article is continuation of the research works concerning the principal and direct roof strata deflection above the deposit mined by means of the chamber-pillar system with roof deflection in the exploitation conditions of the copper deposits in LGOM. A model of the roof deflection and the solutions of the equations of the beam’s axis deflection have been shown in the earlier papers. In this paper has presented the functions of the deflection with two points: A and B of start of stratification the Basic and Direct Roof. The Point A has located in the area over the seam of deposit, and the Point B — over the pillars (Fig. 1). The new constants of equations have been calculated. The new lines describing deflection of the Roof Beams have been presented in the figure 2 and 3.
Access status: Open Access ,
Warunki optymalizacji kształtu wyrobisk podziemnych
(Wydawnictwa AGH, 2009) Różański, Adrian; Sobótka, Maciej
A new condition in view of underground excavation shape optimization is proposed. Linear elastic model of rock mass is assumed. Both ellipsoidal and half-ellipsoidal excavation shapes are considered. In order to verify the proposed criterion numerical results are compared with the solution formulated by Sałustowicz. Numerical simulations are performed and the conclusions are formulated.
Access status: Open Access ,
Weryfikacja warunków optymalności kształtu tunelowych wyrobisk podziemnych
(Wydawnictwa AGH, 2011) Sobótka, Maciej; Kawa, Marek; Różański, Adrian
A verification of shape optimization procedures of tunnel underground excavations is presented. Elliptic shapes of underground excavation with permanent support are investigated. For different values of a ratio of horizontal and vertical initial stresses an optimum ratio of main axes of ellipse is quested. Three different quantities are considered to determine optimum shape: a convergence, an energy of volumetric strain in a core and maximum normal stress within the support. For chosen value of initial stresses ratio also an influence of support stiffness is examined. Conclusions are formulated on the basis of comparison of obtained results with the results from shape optimization procedure presented in previous paper.