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Keywords: hard rock
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Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-0210
..., in general, tend to overestimate this critical strength parameter in hard rocks. Alternative approaches are therefore to be developed that are more accurate, reliable, robust and more suitable to hard and brittle rock-like solids. This paper, first, reviews some of the widely accepted testing techniques...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-0390
... ABSTRACT: The development of a constitutive model for hard rock goes hand in hand with conventional experiments, which provide information about the intrinsic failure properties of the material. To date most models are calibrated and validated using the macro stress-strain responses from...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-2158
... ABSTRACT: In order to reflect effectively the temperature influence on the long-term stability of surrounding rock of deep underground cavern, the triaxial creep tests of deep hard rock under different temperatures were carried out based on an important hydropower station. According...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-892
... of a roller disc (low wear rate) with the effectiveness of a drag tool (low cutting forces). Even though various realizations of the undercutting concept and actuated cutters exist in equipments designed to mechanically excavate hard rocks, the rock failure mechanism and its influencing factors are still...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-713
... ABSTRACT: Post-peak mechanical properties of rock have important significance to reveal the mechanism of rock deformation, damage and fracture. Based on the conventional triaxial compression test of hard rock of the Tieshan mine, including marble, homogenic migmatite, banded migmatite, gneiss...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-1286
... construction, the TBMs were operated in different modes in soft ground, mixed-face ground and hard rock. The damaged cutter house and cutters were replaced by accessing the cutterhead through a vertical shaft ahead of the TBM after ground treatment. Due to the engineering means and methods, the tunnels were...
Proceedings Papers

Paper presented at the 49th U.S. Rock Mechanics/Geomechanics Symposium, June 28–July 1, 2015
Paper Number: ARMA-2015-458
...1. INTRODUCTION The Particle Flow Code (PFC), a numerical simulation code based on the distinct element method (DEM), is an effective numerical tool for simulating the failure process of hard rocks. By introducing the contact- and parallel-bond and clumped particle model (Cho et al., 2007 [1 PFC...
Proceedings Papers

Paper presented at the 47th U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2013
Paper Number: ARMA-2013-515
... Abstract: The Particle Flow Code (PFC), a simulation code based on the distinct element method (DEM), is an effective numerical tool for simulating the failure process of hard rock. By introducing contact- and parallel-bond and clump logic, the code has become better able to express...
Proceedings Papers

Paper presented at the 46th U.S. Rock Mechanics/Geomechanics Symposium, June 24–27, 2012
Paper Number: ARMA-2012-501
... ABSTRACT: The bonded-particle model (BPM) consisting of parallel-bonded disks or spheres suffers from the limitation that if one matches the unconfined-compressive strength ( ) of a typical hard rock, then the direct-tension strength ( ) of the model will be too large. This limitation can...
Proceedings Papers

Paper presented at the 46th U.S. Rock Mechanics/Geomechanics Symposium, June 24–27, 2012
Paper Number: ARMA-2012-173
... ABSTRACT: In the design of rock structures such as tunnels and underground caverns, a continuity analysis considering the nonlinearity of rock has been used in many cases. On the other hand, the mechanical and hydraulic behavior of hard rock is governed by discontinuities of various sizes...
Proceedings Papers

Paper presented at the 44th U.S. Rock Mechanics Symposium and 5th U.S.-Canada Rock Mechanics Symposium, June 27–30, 2010
Paper Number: ARMA-10-459
... failure criterion, the rock dilation is assumed to remain as a constant when the rock mass is deformed. In many numerical analysis tools [11-14], the default value for dilation angle is often zero for all the nonlinear constitutive models. Reservoir Characterization hard rock dilation angle model...
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-06-1068
... beneath located hard rock mine workings, since: (i) due to stress relaxation, generally considered as a positive phenomenon, this layer is able to relieve stress concentrations within its own and the adjacent rock volume, however, due to the associated load transfer process the layer may develop...
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-01-1503
... ABSTRACT : The objective of this work is to propose a constitutive model in order to describe coupled plastic damage behaviour of partially saturated concrete and hard rocks. Plastic behaviour is characterised by using two yield surfaces respectively for stress controlled and suction...
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-01-0935
... ABSTRACT : To verify the feasibility and efficiency of rotary-percussive drilling assisted by waterjets in very hard rocks, experiments on the performance of Polycrystalline Diamond Compact (PDC) cutters resisting different combined loads of static thrust, impact, cutting and waterjets...
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-99-0903
... 1974, Cundall et al. 1994). More recently, researchas shown that deep stopes in hard rock undergo significant time-dependent deformation (Malan 1998). The improved understanding of the time-dependent rock response provides a firm foundation for the assessment of different mining rates or multiple shift...
Proceedings Papers

Paper presented at the The 31st U.S. Symposium on Rock Mechanics (USRMS), June 18–20, 1990
Paper Number: ARMA-90-0011
.... Reservoir Characterization Engineering mechanism Upstream Oil & Gas selection metals & mining geomechanics research centre Ground Control Toronto research chair new initiative reservoir geomechanics hard rock mechanics research rock mass laurentian university canadian rock mechanics...
Proceedings Papers

Paper presented at the The 29th U.S. Symposium on Rock Mechanics (USRMS), June 13–15, 1988
Paper Number: ARMA-88-0553
... improvement, is an accurate model of hard rock cutting. Research undertaken at the Centre Mines Infrastructure (CMI) of the Ecole Nationale Supérieure des Mines de Paris (ENSMP) has shown that the compressive failure of brittle rock under the action of a pick is a combination of two fundamental modes: shear...
Proceedings Papers

Paper presented at the The 28th U.S. Symposium on Rock Mechanics (USRMS), June 29–July 1, 1987
Paper Number: ARMA-87-0989
... for excavating hard rock. Having identified the need for a mobile rock excavating tool, Caterpillar has introduced the D9L Impact Ripper. This new concept shatters previous ripping limitations by combining the weight of a large crawler tractor and the increased traction provided by a resilient undercarriage...
Proceedings Papers

Paper presented at the The 27th U.S. Symposium on Rock Mechanics (USRMS), June 23–25, 1986
Paper Number: ARMA-86-0816
... ABSTRACT The Spallation Process Because of the low thermal conductivity of many hard rocks, rapid heating of these rocks produces a thin surface layer in which the temperatures attain high values. Thermal expansion of this surface layer is constrained by the remainder of the still cool rock...
Proceedings Papers

Paper presented at the 20th U.S. Symposium on Rock Mechanics (USRMS), June 4–6, 1979
Paper Number: ARMA-79-0309
... ABSTRACT: Traditionally, drag bit cutting has not been an effective method of excavating hard rock. Heat and stress concentrations limit the allowable forces on the cutter tip. The limitation on forces in turn limit the depth of cut. Furthermore, shallow cuts result in inefficient cutting...

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