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Keywords: blasthole
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Proceedings Papers
Publisher: American Rock Mechanics Association
Paper presented at the 58th U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2024
Paper Number: ARMA-2024-1184
... Waveform (MSW) model accurately predicted the dominant frequency at highwalls from near-field blasts. Blast design scenarios were then modeled for blast vibration PPV's and dominant frequency. With parameters from the signature hole blast vibration and fragmentation measurement, the Multiple Blasthole...
Proceedings Papers
Publisher: American Rock Mechanics Association
Paper presented at the 58th U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2024
Paper Number: ARMA-2024-0296
... ABSTRACT: Blasthole pattern selection is often decided without any evaluation of the structure of the rock mass to be blasted. This is in part due to production constraints that can determine the position of a given blast in the pit, thereby making it difficult to correctly accommodate...
Proceedings Papers
Publisher: American Rock Mechanics Association
Paper presented at the 58th U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2024
Paper Number: ARMA-2024-0522
... geomechanics operation ore recovery characteristic blasthole general geologist campbell cambell modeling & simulation coarser fragmentation sub-level caving blast modelling blast design parameter blasting ARMA 24 522 Sub-Level Caving Blast Modelling to Determine the Impact of Blast Design...
Proceedings Papers
Publisher: American Rock Mechanics Association
Paper presented at the 56th U.S. Rock Mechanics/Geomechanics Symposium, June 26–29, 2022
Paper Number: ARMA-2022-0671
... model is used to quantify shear and tensile failure. In simulations with two blastholes separated by up to one meter, damage patterns emanating from boreholes interact to form self-organizing ‘fracture-like’ structures. Mechanical interaction between the two blasts is a function of the input charge wave...
Proceedings Papers
Publisher: American Rock Mechanics Association
Paper presented at the 56th U.S. Rock Mechanics/Geomechanics Symposium, June 26–29, 2022
Paper Number: ARMA-2022-0756
... Waveform (MSW) near- and far-field blast vibration model, and the Multiple Blasthole Fragmentation (MBF) model. Both MSW and MBF models are built on the fundamentals and empirical aspects of blasting mechanics. The blast vibration at the highwalls from trim blasts was predicted with MSW model. The effects...
Proceedings Papers
Publisher: American Rock Mechanics Association
Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-0012
... to simulate the total process of blasting based upon first principles of physics. The 3D kinematic model for muckpile formation was developed and applied as a useful tool to open pit blasts. The multiple blasthole fragmentation (MBF) model developed during recent years has been applied successfully to many...
Proceedings Papers
Publisher: American Rock Mechanics Association
Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1030
... is highly desirable. To obtain fine fragmentation, it is often required to use blast designs with favorable energy concentration through explosive loading or blasthole delay timing. Such blast designs have potential to cause high blast vibration at highwalls or nearby community. A systematic blast...
Proceedings Papers
Publisher: American Rock Mechanics Association
Paper presented at the 50th U.S. Rock Mechanics/Geomechanics Symposium, June 26–29, 2016
Paper Number: ARMA-2016-810
... vibrations. The use of presplit blastholes and control of the amount of explosive detonated per delay are typical techniques used to help mitigate such unwanted effects. Recently, through the use of electronic initiation systems for mine blasting, timing and initiation sequence have become additional...
Proceedings Papers
Publisher: American Rock Mechanics Association
Paper presented at the 46th U.S. Rock Mechanics/Geomechanics Symposium, June 24–27, 2012
Paper Number: ARMA-2012-476
..., such as propagation velocity and resonance frequency, and explosive characteristics such as velocity of detonation (VOD) and the geometry of the blasting round. The final PPV value of any particular blasthole of the round is determined through the linear superposition of multiple waveforms, generated for a number...
Proceedings Papers
Publisher: American Rock Mechanics Association
Paper presented at the 46th U.S. Rock Mechanics/Geomechanics Symposium, June 24–27, 2012
Paper Number: ARMA-2012-146
... ABSTRACT: Rock blasting process is very complicated and is affected by many factors such as internal and external factors. Internal factors are related to controllable parameters such as blasthole and bench dimensions and explosive parameters. External factors are uncontrollable and in blast...
Proceedings Papers
Publisher: American Rock Mechanics Association
Paper presented at the 46th U.S. Rock Mechanics/Geomechanics Symposium, June 24–27, 2012
Paper Number: ARMA-2012-681
... been carried out. IV. Model calibration The implementation of fully insuumented single blasthole tests enabled the calibration of the HSBM boundary conditions and defInition of model solution parameters associated with strength and strain rate dependencies; resolution; attenuation and gas flow. Figure...
Proceedings Papers
Publisher: American Rock Mechanics Association
Paper presented at the 45th U.S. Rock Mechanics / Geomechanics Symposium, June 26–29, 2011
Paper Number: ARMA-11-467
... history was simplified and applied to the blasthole walls. Accordingly, the interaction of explosive energy transferred to the rock mass from the blasthole pressure was examined as a function of distance to the fault plane from the blasthole. A Mohr-Coulomb material model was used for host rock to allow...
Proceedings Papers
Publisher: American Rock Mechanics Association
Paper presented at the 45th U.S. Rock Mechanics / Geomechanics Symposium, June 26–29, 2011
Paper Number: ARMA-11-466
... of each blasthole. Important parameters that were considered in the analysis were stress tensor and fracturing pattern. The blast loading magnitude and blasthole spacing were found to be very significant in the final results. INTRODUCTION Drilling and blasting continues to be an important method...
Proceedings Papers
Publisher: American Rock Mechanics Association
Paper presented at the 43rd U.S. Rock Mechanics Symposium & 4th U.S. - Canada Rock Mechanics Symposium, June 28–July 1, 2009
Paper Number: ARMA-09-092
... reservoir geomechanics radial compressive stress exponent peak strain long rock bar stress wave blasthole inspection hole damage zone compressive stress wave transition zone rock mass initial stress cylindrical charge decay amplitude concrete block equation ARMA 09-092 Extent of damage...
Proceedings Papers
Publisher: American Rock Mechanics Association
Paper presented at the The 42nd U.S. Rock Mechanics Symposium (USRMS), June 29–July 2, 2008
Paper Number: ARMA-08-054
... into the following categories: Fracture in-situ: <1 % Breakage: 15% Displacement: 4% Crushing in the vicinity of the blasthole: 1.5 to 2% Fly-rock: <1% Deformation of solid rock behind the shot: <1% Ground vibrations: 40% Air blast/noise : 38 to 39 % Many researchers have studied the influence of fragmentation...
Proceedings Papers
Publisher: American Rock Mechanics Association
Paper presented at the Golden Rocks 2006, The 41st U.S. Symposium on Rock Mechanics (USRMS), June 17–21, 2006
Paper Number: ARMA-06-1005
... long blastholes at each site with 1.5 kg of a commercial emulsion explosive (Magnafrac Plus HW Emulsion). Explosive materials were placed using subgrade and stemming depths of 0.56 m and 1.22 m, respectively, in each blasthole. A depth of charge burial and weight was adopted that was sufficient...
Proceedings Papers
Publisher: American Rock Mechanics Association
Paper presented at the DC Rocks 2001, The 38th U.S. Symposium on Rock Mechanics (USRMS), July 7–10, 2001
Paper Number: ARMA-01-0409
... sloughage principal stress stability dilution contour stope hanging-wall rock mass extraction primary stope boundary secondary stope blasthole Rock Mechanics in the National Interest, Elsworth, Tinucci & Heasley (eds), ¸ 2001 Swets & Zeitlinger Lisse, ISBN 90 2651 827 7 Evaluation of stress...
Proceedings Papers
Publisher: American Rock Mechanics Association
Paper presented at the The 35th U.S. Symposium on Rock Mechanics (USRMS), June 5–7, 1995
Paper Number: ARMA-95-0541
... ABSTRACT: A field experiment was carried out to investigate the explosive/rock intexaction in confined and highly stressed rock ahead of a development end (tunnel) at 2.7 km below surface. A total of four test blasts were carded out in the tunnel. The explosive type and amount, blasthole...
Proceedings Papers
Publisher: American Rock Mechanics Association
Paper presented at the The 34th U.S. Symposium on Rock Mechanics (USRMS), June 28–30, 1993
Paper Number: ARMA-93-0721
... in a single 7.0 m borehole below a horizontal free surface in granitic rock. A series of 32 vertical water-filled boreholes were drilled around the blasthole (Figure 1), to perform seismic P-wave velocity measurements [2]. Approximately 300 travel time delays were measured in a horizontal image plane...
Proceedings Papers
Publisher: American Rock Mechanics Association
Paper presented at the The 30th U.S. Symposium on Rock Mechanics (USRMS), June 19–22, 1989
Paper Number: ARMA-89-0571
... material strength as a function of depth. This information has been used in determining the placement of explosive in selective loading of blastholes and estimating the amount of lump product in a particular section of an ore body. 1 INTRODUCTION In open cut mining, the determination of the location...
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