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Keywords: excavation
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Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1577
... transfer to the surrounding of the tunnel. This technique has been widely used in deep mines of Canada and South Africa, as a tool for risk mitigation of violent ruptures from the face in excavations, phenomenon known as strainburst. In this paper, we will describe the design background...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1600
... ABSTRACT: Underground rock engineering design continues to progress to complex and deep excavations in order to tackle increasing demand of minerals and metals. The responses of engineered systems in rocks, in general, are highly-nonlinear, time-dependent, uncertain, and not yet completely...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-0017
... the response of the empirical design of Warren et al., 2018, for a W-RMR range of 10-35. Based on these initial numerical models, comparisons are made to illustrate the effects of changing the excavation profile (i.e. square, circle, and horseshoe) as well as including floor support (i.e. cables, and invert...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1180
... instability stability excavation application support pressure hong kong rock mass rock mass condition ARMA 21 1180 Discrete Fracture Network Approach in Ground Support Design Optimisation for Large Span Cavern in Jointed Rock Mass Haryono, I. S. Golder Associates (Hong Kong), Hong Kong, People s...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1576
... Abstract Many parameters are used to calculate the stability of slopes in an open pit mine. An important parameter is Factor D, which is used to represent the disturbance zone of a slope as a result of the stress relaxation and blasting resulting from the excavation. This parameter can...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1210
... of fill materials produced in massive rock excavations, b) the use of High Energy Impact Compactors (HEIC), c) a very demanding construction schedule that dictated optimization of the lift thickness of placed materials and d) very demanding functional requirements associated with performance of critical...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-2156
... ABSTRACT: Tunnels constructed in soft rock and high field stress show significant gradual convergence with even after the excavation. This paper proposes a new visco-elastic-plastic solution for deep circular tunnel under squeezing conditions. The model is composed of Mohr-Coulomb plasticity...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1304
... composition leads to the loose and fractured structure of talus-like formations, which is highly sensitive to the excavation perturbation. Therefore, Tayi tunnel has become the controlled pot of the whole highway project as the construction speed has to be slowed down in order to reduce the deformation...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1238
... excavations induces changes in the in-situ stresses of the rock mass. These changes are not produced by externally applied loads, but are the result of the rock mass restoring the equilibrium that was perturbed by the excavation. Over time, many hypotheses have been formulated to explain the in-situ state...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1947
... excavated until now. The excavation of the first X shaped intersection will occur in 2021. Five installation phases, following the excavation steps, are planned to set up the instruments that will monitor the hydromechanical behavior of the COx. The acquired data comes from direct observations (geological...
Proceedings Papers

Paper presented at the 54th U.S. Rock Mechanics/Geomechanics Symposium, June 28–July 1, 2020
Paper Number: ARMA-2020-1712
... ABSTRACT: Mining in highly fractured ground at the Turquoise Ridge underground mine in Nevada presents challenges to maintaining long-term development and ore headings. The ground conditions at Turquoise Ridge require a variety of excavation techniques to successfully mine and maintain safe...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-0022
..., which is located at 1000 m from the earth's surface and it was excavated in 1984 by using the room-and-pillar mining method. The shaft station is surrounded by several longwall panels that were exploited between 1984 and 1994. To assess the stress redistribution and the stored strain energy...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-0350
... of support properties and installation time with respect to opening development. In comparing the GRCs and the SRCs for different support systems, one can evaluate the effectiveness of installed support system in maintaining the integrity of the excavated area(s). This paper presents a preliminary...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-0016
... reservoir geomechanics Rock mechanics mining drive Reservoir Characterization Upstream Oil & Gas mechanism compression test stress concentration rockburst metals & mining quartzite international journal investigation Orebody specimen excavation pillar footwall quartzite tangent...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-0037
... ABSTRACT: In this study, bump potential in the vicinity of a fault zone associated with a longwall mining excavation is evaluated with respect to the different stages of shear strain in the normal fault through the use of a numerical modeling technique. The influence of stored and dissipated...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-0301
... in a repository. In this study, rectangle, triangular and trapezoidal cutoff shapes for drift sealing are numerically modeled. The extent of the excavation damaged zone in crystalline rock is predicated for changes in the shape and size of these cutoffs. The excavation damaged zone dimensions are determined based...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-0429
... ABSTRACT: Rock bolt is one of the major support systems of tunnel engineering. It is used to stabilize suspended rock blocks around an excavation section, reinforce rock mass, and reduce displacement along rock joints. This study proposed a rock bolt model, which includes two parts: a bolt...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-0471
... ABSTRACT: This paper presents a comprehensive investigation regarding rock mass stability of tunnels excavated in faulted zone. The investigation features a typical Chinese procedure that addresses the support design of large tunnels in difficult grounds. Site survey, mechanical tests...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-0484
... coupled with representative Discrete Fracture Networks (DFN) has been proven to provide accurate models of the actual response of a rock mass undergoing excavation. However, considering the statistical nature of DFN's, multiple simulations need to be run in order to obtain statistically significant...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-1583
... ABSTRACT: We developed a coupled THMC model that can describe the long-term evolution in hydraulic and mechanical properties of the rock masses such as permeability and stiffness due to geochemical reactions within rock fractures induced by cavity excavation. Using the developed model, long...

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