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Keywords: underground excavation
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Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-0037
... normal fault bump potential fracture characterization shear strain plastic energy fault deformation underground excavation fault induce characteristic numerical tool longwall panel Fault Zone deformation 1. INTRODUCTION This paper is part of an effort by the National Institute for...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-1636
... ABSTRACT: Rock bridges are sections of an intact rock along otherwise through-going discontinuities, and the rock bridges play an important role in the geotechnical stability of underground excavations, surface slopes of mines, dams, foundations and other earth retaining structures. Numerical...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-1629
.... Ground conditions, geological discontinuities, excavation geometry, support design measures and mining methods are fundamental factors influencing FoGs. Despite the advances in underground excavation design, there is still a need for developing tools capable of characterizing ground stability which is...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-1331
... creep rate underground excavation mechanics strain rate inelastic strain rate ABSTRACT: Rock salt exhibits a strain and time dependent response under deviatoric stresses. The practical implications of this creeping behavior have been studied extensively for the design of underground...
Proceedings Papers

Paper presented at the 51st U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2017
Paper Number: ARMA-2017-0479
... ABSTRACT: Rockbursts under high stress environment is of prime concerns during underground excavations. Infrared camera thermography could be of some value for assessing hot spots at the excavation face, which may result in pop-ups, spalling or rockbursting. The authors undertook an...
Proceedings Papers

Paper presented at the 51st U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2017
Paper Number: ARMA-2017-0744
... ABSTRACT: A quantitative assessment of rock mass behaviors around underground excavations is essential in mining since it can assist engineers in selecting appropriate mining methods and implementing reliable ground control measures. In this paper, the interactions between the factors...
Proceedings Papers

Paper presented at the 50th U.S. Rock Mechanics/Geomechanics Symposium, June 26–29, 2016
Paper Number: ARMA-2016-211
... continuum/discontinuum methodology, which takes advantage of each modeling scheme while simultaneously minimizing the requirement for computational resources, has been applied successfully to model large-scale underground excavations. Based on the mixed continuum/discrete numerical model using 3DEC, the...
Proceedings Papers

Paper presented at the 49th U.S. Rock Mechanics/Geomechanics Symposium, June 28–July 1, 2015
Paper Number: ARMA-2015-839
... rockmass shotcrete reservoir characterization strength field observation screening excavation underground excavation schist support system drift axis reinforcement plane tendon case example application stress distribution deformation 1. INTRODUCTION In ground support applications, the...
Proceedings Papers

Paper presented at the 48th U.S. Rock Mechanics/Geomechanics Symposium, June 1–4, 2014
Paper Number: ARMA-2014-7093
... Abstract Transition of a failure mechanism from extensional to shear dominated failure with increasing confinement is widely observed in the rupture of samples in the laboratory and in situ associated with underground excavation in brittle failing rocks. However, common failure criteria such...
Proceedings Papers

Paper presented at the 46th U.S. Rock Mechanics/Geomechanics Symposium, June 24–27, 2012
Paper Number: ARMA-2012-406
... numerical analysis pipe diameter Umbrella excavation tunnel installation forepole support convergence sensitivity numerical analysis displacement profile Thickness weak rock application design parameter rock mass underground excavation 1. INTRODUCTION The optimization of the underground...
Proceedings Papers

Paper presented at the 45th U.S. Rock Mechanics / Geomechanics Symposium, June 26–29, 2011
Paper Number: ARMA-11-155
... mass (respectively abbreviated as strength and stress below) is the major factor in determining the reliability and stability of an underground excavation. In other words, defining the relationship between the strength and the stresses has become the fundamental job in the design and construction of...
Proceedings Papers

Paper presented at the 45th U.S. Rock Mechanics / Geomechanics Symposium, June 26–29, 2011
Paper Number: ARMA-11-251
... ABSTRACT When an underground excavation is cut in a discontinuous rigid rock mass, instabilities may occur mainly due to block failure. Isolated rigid block methods were developed since the 80’s to locate critical blocks and evaluate their stability but have major drawbacks: ignoring in-situ...
Proceedings Papers

Paper presented at the Golden Rocks 2006, The 41st U.S. Symposium on Rock Mechanics (USRMS), June 17–21, 2006
Paper Number: ARMA-06-1141
... all different measurement points. INTRODUCTION This work reports on analyses so far conducted for the assessment of conditions of stability in underground excavation for the extraction of ornamental stone. In particular, the study regards the Ordinary and Arabesque B-slabs marble quarry, located...
Proceedings Papers

Paper presented at the Golden Rocks 2006, The 41st U.S. Symposium on Rock Mechanics (USRMS), June 17–21, 2006
Paper Number: ARMA-06-974
... ABSTRACT: A field study and modeling experiments at laboratory scale were conducted to investigate the effects of repeated episodes of seismic motions on dynamic behavior of jointed rock mass around underground excavations. Results of the studies show that a threshold level of seismic...
Proceedings Papers

Paper presented at the DC Rocks 2001, The 38th U.S. Symposium on Rock Mechanics (USRMS), July 7–10, 2001
Paper Number: ARMA-01-1531
... use of the method, along with the validation of generated meshes using a commercial finite element package, are presented in the paper. 1 INTRODUCTION The finite element method (FEM) plays an important role in the design of underground excavations. FEM software tools are used to determine the type...
Proceedings Papers

Paper presented at the DC Rocks 2001, The 38th U.S. Symposium on Rock Mechanics (USRMS), July 7–10, 2001
Paper Number: ARMA-01-1413
...Rock Mechantcs tn the Nattonal Interest, Elsworth, Ttnucct & Heasley (eds), ¸ 2001 Swets & Zetthnger Dsse, ISBN 90 2651 827 7 Simulation of earthquake ffects on underground excavations using Discontinuous Deformation Analysis (DDA) S.M.Hsiung Center for Nuclear Waste Regulatory Analyses, Southwest...
Proceedings Papers

Paper presented at the DC Rocks 2001, The 38th U.S. Symposium on Rock Mechanics (USRMS), July 7–10, 2001
Paper Number: ARMA-01-0483
... the latter case, micro fractures develop at the grain scale and evolve into visible fractures. Extensive observations and measurements from the underground excavations at the Waste Isolation Pilot Plant (WIPP), together with a reliable finite elementool, can be used to study the fracture and failure...
Proceedings Papers

Paper presented at the Vail Rocks 1999, The 37th U.S. Symposium on Rock Mechanics (USRMS), June 7–9, 1999
Paper Number: ARMA-99-0893
... INTRODUCTION ABSTRACT: This paper presents a numerical modeling of damage extension around a keyed underground excavation using a continuous damage model. In the 3-dimensionnal code, FLAC ?ø, we have implemented an anisotropic damage model. Tfiaxial compression tests provide a verification...
Proceedings Papers

Paper presented at the The 32nd U.S. Symposium on Rock Mechanics (USRMS), July 10–12, 1991
Paper Number: ARMA-91-587
... Design rocksalt long term behavior Upstream Oil & Gas long term convergence strain rate single gallery constitutive law infinite row creep asymptotic stress state underground excavation loading mechanical parameter Rock Mechanics as a Multidisctplinary Science, Roegiers (ed ) ¸ 1991...
Proceedings Papers

Paper presented at the The 30th U.S. Symposium on Rock Mechanics (USRMS), June 19–22, 1989
Paper Number: ARMA-89-0301
... & Simulation similitude quantity tunnel convergence quantity underground excavation ABSTRACT ABSTRACT: The scope of this paper is to introduce a mathematical model based on matrix algebra in order to determine similitude quantities, which can be arranged in specific formats to simulate the field...

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