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Keywords: breakage
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Proceedings Papers

Paper presented at the 15th ISRM Congress, October 9–14, 2023
Paper Number: ISRM-15CONGRESS-2023-035
... the drill bit and the rock, as well as to improve the drilling speed through the efficiency increase of rock breakage (Ma et al., 1995; Wu et al., 2014). In deep and ultra-deep wells(Guarin et al., 1949; Whiteley and England, 1985; Wanamaker, 1951; Melamed et al., 2000), the difficulty of drilling speed...
Proceedings Papers

Paper presented at the 15th ISRM Congress, October 9–14, 2023
Paper Number: ISRM-15CONGRESS-2023-090
... sustainable development co2 emission rockpulse breakage knowledge efficiency world steel association metals & mining information reduction driller european environment agency climate change optimization rock solution sensor deviation 15th ISRM Congress 2023 & 72nd Geomechanics...
Proceedings Papers

Paper presented at the 14th ISRM Congress, September 13–18, 2019
Paper Number: ISRM-14CONGRESS-2019-186
... of both single and coplanar embedded (intermittent) joints on the shear strength of direct shear test samples were experimentally examined. specimen shear strength configuration powder upstream oil & gas plane dilation breakage bridge reservoir characterization shear displacement...
Proceedings Papers

Paper presented at the 14th ISRM Congress, September 13–18, 2019
Paper Number: ISRM-14CONGRESS-2019-247
... reservoir characterization shear strength shear stiffness breakage drilling operation amplitude dither amplitude shear displacement specimen friction controller engelder upstream oil & gas mechanism effect scholz byerlee university investigation stick-slip amplitude...
Proceedings Papers

Paper presented at the 14th ISRM Congress, September 13–18, 2019
Paper Number: ISRM-14CONGRESS-2019-305
... of villages and infrastructures. Hungr and Evans (2004) presented a survey of different mechanisms that may cause high mobility in rock avalanches. One of these mechanisms is rock breakage. Dispersion due to fragmentation and expansion of the source rock mass has been shown to occur in many rock avalanches...
Proceedings Papers

Paper presented at the 14th ISRM Congress, September 13–18, 2019
Paper Number: ISRM-14CONGRESS-2019-135
... Abstract Microwave assisted rock fragmentation is a promising technique in rock breakage and drilling. Understanding the influence of microwave irradiation induced damage on rock fragmentation properties is thus desirable. In this work, cylindrical Fangshan granite (FG) specimens are exposed...
Proceedings Papers

Paper presented at the 13th ISRM International Congress of Rock Mechanics, May 10–13, 2015
Paper Number: ISRM-13CONGRESS-2015-345
... the pre- and post- fragmentation size distribution (as in Figure 3), several breakage parameters proposed by Hardin (1985) were used to quantify material fragmentation under compression. Hardin defined the total breakage (Bt) as the area enclosed between the initial and final particle size distribution...
Proceedings Papers

Paper presented at the 8th ISRM Congress, September 25–29, 1995
Paper Number: ISRM-8CONGRESS-1995-015
... of harmful consequences in terms of time consumption, additional costs and environmental impacts (noise and fly rock, essentially). Therefore in practice the complete absence of secondary breakage is a measure of blasting effiency, as well as a proof of ability for the blast engineers. The reasons...
Proceedings Papers

Paper presented at the 7th ISRM Congress, September 16–20, 1991
Paper Number: ISRM-7CONGRESS-1991-290
... broken rock and loose broken rock. The model applies breakage mechanisms to the in situ block size distribution to predict the muck pile fragmentation and the changed in situ block size distribution RESUMÉ: On a construit un modèle mathematique de fragmentation et changement de structure de la masse...
Proceedings Papers

Paper presented at the 7th ISRM Congress, September 16–20, 1991
Paper Number: ISRM-7CONGRESS-1991-074
... structural geology criterion failure criterion failure envelope strength resistance particle breakage MPa Marsal Upstream Oil & Gas rockfill type Reservoir Characterization Barton variation Rockfill kjaernsli stress level experimental data breakage yudhbir marachi...
Proceedings Papers

Paper presented at the 6th ISRM Congress, August 30–September 3, 1987
Paper Number: ISRM-6CONGRESS-1987-257
... improving fragmentation, reducing damage, and controlling ground vibration. FRAGMENTATION MODELLING The JKMRC fragmentation and damage model is based on the following observations: 1. fracturing has the largest single influence on fragmentation and damage; 2. the degree of breakage of a rock...
Proceedings Papers

Paper presented at the 4th ISRM Congress, September 2–8, 1979
Paper Number: ISRM-4CONGRESS-1979-151
... Faculty of Engineering, Kyoto Univ., Japan Faculty of Engineering, Kyoto Univ., Japan Dr., Assoc. Prof., Faculty of Engineering, Kyoto Univ., Japan Dr., Prof., Faculty of Enginee~ing, Kyoto Univ., Japan SUMMARY We have attempted to monitor the progress of breakage in a rock mass by using an acoustic...
Proceedings Papers

Paper presented at the 2nd ISRM Congress, September 21–26, 1970
Paper Number: ISRM-2CONGRESS-1970-206
... crack from hole to hole is created without cracks in the other directions has not been clarified completely. Therefore, in order to clarify the mechanism of rock breakage by smooth blasting and to find out a better technique which can be used more satisfactory to the purpose, both the state...
Proceedings Papers

Paper presented at the 1st ISRM Congress, September 25–October 1, 1966
Paper Number: ISRM-1CONGRESS-1966-149
... discussing rock breakage under dynamic, or impulsive, loading than when considering rock breakage under static loads (KOLSKY and SHEARMAN, 1949; SCHARDIN, 1950; RINEHART and PEARSON, 1954; RINEHART, 1960a ). Impulsive loads generate transient stress disturbances which move through bodies and create highly...

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