Change search
Link to record
Permanent link

Direct link
BETA
Ouchterlony, Finn
Publications (10 of 138) Show all publications
Ouchterlony, F., Bergman, P. & Nyberg, U. (2013). Fragmentation in production rounds and mill through-put in the Aitik copper mine: a summary of development projects 2002-2009 (ed.). In: (Ed.), Pradeep K. Singh; Amalendu Sinha (Ed.), Rock Fragmentation by Blasting, FRAGBLAST 10: Proceedings of the 10th International Symposium on Rock Fragmentation by Blasting. Paper presented at International Symposium on Rock Fragmentation by Blasting : 24/11/2012 - 29/11/2012 (pp. 117-128). Boca Raton, Fla.: CRC Press/Balkema
Open this publication in new window or tab >>Fragmentation in production rounds and mill through-put in the Aitik copper mine: a summary of development projects 2002-2009
2013 (English)In: Rock Fragmentation by Blasting, FRAGBLAST 10: Proceedings of the 10th International Symposium on Rock Fragmentation by Blasting / [ed] Pradeep K. Singh; Amalendu Sinha, Boca Raton, Fla.: CRC Press/Balkema , 2013, p. 117-128Conference paper, Published paper (Refereed)
Abstract [en]

The Boliden Mineral Aitik mine has worked to increase the through-put in the primary AG mills together with Swebrec. A raised specific charge from 0.9 to 1.3 kg/m3 raised the throughput by nearly 7%. This was implemented in 2009. For two rounds Swebrec has mapped joints from 3D images to determine the rock mass factor and combined Split Desktop measurements with sieving of muck-pile samples to get the sieving curve of the muck pile, based on the Swebrec function. For a 3rd round such curves were fed into a crusher model and results compared with Online data. The crusher product can affect the mills by three mechanisms; a harder blasting that i) produces more fines that may pass the mill intact, ii) gives a finer crusher product which takes a shorter time to grind iii) increases the amount of larger stones that pass the crusher intact but have an increased grindability. All three must contribute to the increased mill through-put.

Place, publisher, year, edition, pages
Boca Raton, Fla.: CRC Press/Balkema, 2013
National Category
Other Civil Engineering
Research subject
Mining and Rock Engineering
Identifiers
urn:nbn:se:ltu:diva-34224 (URN)85be4a86-8f03-4ab2-917c-13124d0eafde (Local ID)978-0-415-62143-4 (ISBN)978-0-203-38767-2 (ISBN)85be4a86-8f03-4ab2-917c-13124d0eafde (Archive number)85be4a86-8f03-4ab2-917c-13124d0eafde (OAI)
Conference
International Symposium on Rock Fragmentation by Blasting : 24/11/2012 - 29/11/2012
Note
Godkänd; 2013; 20121203 (ysko)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-25Bibliographically approved
Ouchterlony, F. & Moser, P. (2013). Lessons from single-hole blasting in rock (ed.). In: (Ed.), P K Singh; A Sinha (Ed.), Rock Fragmentation by Blasting: Fragblast 10. Paper presented at International Symposium on Rock Fragmentation by Blasting : 24/11/2012 - 29/11/2012 (pp. 3-14). Boca Raton, Fla.: CRC Press/Balkema
Open this publication in new window or tab >>Lessons from single-hole blasting in rock
2013 (English)In: Rock Fragmentation by Blasting: Fragblast 10 / [ed] P K Singh; A Sinha, Boca Raton, Fla.: CRC Press/Balkema , 2013, p. 3-14Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
Boca Raton, Fla.: CRC Press/Balkema, 2013
National Category
Other Civil Engineering
Research subject
Mining and Rock Engineering
Identifiers
urn:nbn:se:ltu:diva-32591 (URN)721ade19-b7f2-4c0e-9dc7-ad854f98151b (Local ID)978-0-415-62143-4 (ISBN)978-0-203-38767-2 (ISBN)721ade19-b7f2-4c0e-9dc7-ad854f98151b (Archive number)721ade19-b7f2-4c0e-9dc7-ad854f98151b (OAI)
Conference
International Symposium on Rock Fragmentation by Blasting : 24/11/2012 - 29/11/2012
Note
Godkänd; 2013; 20130107 (finn)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-25Bibliographically approved
Ouchterlony, F. & Moser, P. (2013). On the branching-merging mechanism during dynamic crack growth as a major source of fines in rock blasting (ed.). In: (Ed.), (Ed.), Rock Fragmentation by Blasting: Fragblast 10. Paper presented at International Symposium on Rock Fragmentation by Blasting : 24/11/2012 - 29/11/2012 (pp. 65-75). Boca Raton, Fla.: CRC Press/Balkema
Open this publication in new window or tab >>On the branching-merging mechanism during dynamic crack growth as a major source of fines in rock blasting
2013 (English)In: Rock Fragmentation by Blasting: Fragblast 10, Boca Raton, Fla.: CRC Press/Balkema , 2013, p. 65-75Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
Boca Raton, Fla.: CRC Press/Balkema, 2013
National Category
Other Civil Engineering
Research subject
Mining and Rock Engineering
Identifiers
urn:nbn:se:ltu:diva-34422 (URN)89f8899d-fe1f-4785-9e17-0e94a0b42a69 (Local ID)978-0-415-62143-4 (ISBN)978-0-203-38767-2 (ISBN)89f8899d-fe1f-4785-9e17-0e94a0b42a69 (Archive number)89f8899d-fe1f-4785-9e17-0e94a0b42a69 (OAI)
Conference
International Symposium on Rock Fragmentation by Blasting : 24/11/2012 - 29/11/2012
Note
Godkänd; 2013; 20130107 (finn)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-25Bibliographically approved
Johansson, D. & Ouchterlony, F. (2013). Shock wave interactions in rock blasting: the use of short delays to improve fragmentation in model-scale (ed.). Paper presented at . Rock Mechanics and Rock Engineering, 46(1), 1-18
Open this publication in new window or tab >>Shock wave interactions in rock blasting: the use of short delays to improve fragmentation in model-scale
2013 (English)In: Rock Mechanics and Rock Engineering, ISSN 0723-2632, E-ISSN 1434-453X, Vol. 46, no 1, p. 1-18Article in journal (Refereed) Published
Abstract [en]

A series of detailed small-scale tests have been made to investigate the use of short delays to promote better fragmentation caused by shock wave interactions. The block design had a size of 650/660 × 205 × 300 mm (L × W × H) and two rows with five Ø 10-mm blastholes in each row. The spacing (S) and burden (B) were 110 and 70 mm, respectively, giving an S/B ratio of 1.6. The results showed no distinct differences or high improvements of the fragmentation when the delays were in the time range of interactions compared with no shock wave interactions. The decrease of x 50 (mean size) was around 20 % at a delay time ~1.1 ms/m burden compared with longer delays like 2 ms/m. A statistical analysis of the results has been made to evaluate the minimum at short delays and it is not significant

National Category
Other Civil Engineering
Research subject
Mining and Rock Engineering
Identifiers
urn:nbn:se:ltu:diva-3307 (URN)10.1007/s00603-012-0249-7 (DOI)000313094000001 ()2-s2.0-84872298685 (Scopus ID)11d17030-f8f1-4474-87bf-caae660fba4e (Local ID)11d17030-f8f1-4474-87bf-caae660fba4e (Archive number)11d17030-f8f1-4474-87bf-caae660fba4e (OAI)
Note
Validerad; 2013; 20120405 (dan930)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Wimmer, M., Nordqvist, A. A., Ouchterlony, F., Selldén, H. & Lenz, G. (2012). 3D mapping of sublevel caving (SLC) blast rings and ore flow disturbances in the LKAB Kiruna mine (ed.). In: (Ed.), (Ed.), MassMin 2012: Proceedings of the 6th International Conference and Exhibition on Mass Mining, Sudbury, Canada June 2012: . Paper presented at International Conference & Exhibition on Mass Mining : 10/06/2012 - 14/06/2012. Sudbury, Canada: Canadian Institute of Mining, Metallurgy and Petroeum
Open this publication in new window or tab >>3D mapping of sublevel caving (SLC) blast rings and ore flow disturbances in the LKAB Kiruna mine
Show others...
2012 (English)In: MassMin 2012: Proceedings of the 6th International Conference and Exhibition on Mass Mining, Sudbury, Canada June 2012, Sudbury, Canada: Canadian Institute of Mining, Metallurgy and Petroeum , 2012Conference paper, Published paper (Refereed)
Abstract [en]

Sublevel caving (SLC) is a highly productive mining method with the major disadvantages of irrepressible ore loss and dilution. The confined blasting situation of SLC rings is commonly regarded to have a significant impact upon the material flow characteristics and hence on the overall performance. The initial conditions for the ore flow after blasting are unknown, as both the blasted geometry and the fragmentation itself are normally hidden. However, when opening a new drawpoint and in hang-up situations an inspection of the actual conditions is feasible. For this purpose, a remotely operated 3D photogrammetry system was custom built and used to reconstruct the ring front and/or cavity as a geo-referenced mesh model with colour information. Various blasting situations have been observed and this allowed a deeper study of the i) broken geometry and height, ii) over- and underbreak and their effects on subsequently blasted rings, iii) interaction effects between adjacent holes/rings, iv) drilling accuracy based on identified boreholes and v) mapping of geological structures and their influence on the blast result. The capabilities of the 3D image acquisition system to evaluate the blasting results are demonstrated with an example, in which a series of blasts were surveyed. Monitoring under hang-up situations, has then revealed the actual effects from confined blasting and gravity flow related issues. The 3D photogrammetry system is now increasingly being used to study hang-ups. By revealing and quantifying hitherto inaccessible information, the system has proven to be a valuable tool in increasing the understanding of both SLC breakage and flow.

Place, publisher, year, edition, pages
Sudbury, Canada: Canadian Institute of Mining, Metallurgy and Petroeum, 2012
National Category
Other Civil Engineering
Research subject
Mining and Rock Engineering
Identifiers
urn:nbn:se:ltu:diva-34470 (URN)8ae4aac0-fbda-45bc-9ede-fbc7cc93e8e1 (Local ID)8ae4aac0-fbda-45bc-9ede-fbc7cc93e8e1 (Archive number)8ae4aac0-fbda-45bc-9ede-fbc7cc93e8e1 (OAI)
Conference
International Conference & Exhibition on Mass Mining : 10/06/2012 - 14/06/2012
Note
Godkänd; 2012; Bibliografisk uppgift: CD-ROM; 20121112 (matwim)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-25Bibliographically approved
Wimmer, M., Nordqvist, A. A., Ouchterlony, F., Nyberg, U. & Furtney, J. (2012). Burden movement in confined drift wall blasting tests studied at the LKAB Kiruna SLC mine (ed.). In: (Ed.), Pradeep K. Singh; Amalendu Sinha (Ed.), Rock Fragmentation by Blasting, FRAGBLAST 10: Proceedings of the 10th International Symposium on Rock Fragmentation by Blasting. Paper presented at International Symposium on Rock Fragmentation by Blasting : 24/11/2012 - 29/11/2012 (pp. 373-383). Boca Raton, Fla.: CRC Press/Balkema
Open this publication in new window or tab >>Burden movement in confined drift wall blasting tests studied at the LKAB Kiruna SLC mine
Show others...
2012 (English)In: Rock Fragmentation by Blasting, FRAGBLAST 10: Proceedings of the 10th International Symposium on Rock Fragmentation by Blasting / [ed] Pradeep K. Singh; Amalendu Sinha, Boca Raton, Fla.: CRC Press/Balkema , 2012, p. 373-383Conference paper, Published paper (Refereed)
Abstract [en]

Blasting in SLC (sublevel caving) takes place in a semi-confined situation. Blasted material swells while the caved material compacts, and also, to a lesser extent, fills parts of the void volume of the production drift. Several analytical and empirical models have been developed in the past. However, understanding of the interaction of semi-confined blasting conditions, SLC blast design and rock mass characteristics on rock breaking performance is rudimentary. Instrumentation of the blasted burden with various sensors and study of the dynamics of burden movement against confinement is therefore important. Such measurements are very scarce and thus different systems have been tested both in laboratory and in the field. Main focus was thereby the development of measuring equipment that could be scaled up to full-scale SLC blasting and installed behind the rings. In the field tests, blastholes were drilled in a pillar, parallel to a cross cut drift in the LKAB Kiruna SLC mine. The burden constraint was achieved either by filling the drift of 7.0 x 5.2 m (width x height) with rock masses or reinforcing the drift wall. The tests were instrumented with different redundant sensors, which were installed in holes drilled from a parallel cross cut. The most promising one was a concept, which combines the initial movement recorded by an accelerometer designed to minimize zero-shift with the final displacement recorded by a fibre photoelectric sensor (‘fibre-optic zebra gauge’). For the filled drift wall blasting test the maximum velocity varied between 16 - 32 m/s with a compaction in the range of 4 - 5 %. A gap was verified to exist between the intact pillar and the blasted material. By comparison, the velocity for the unconfined situation yielded a considerably increased velocity (42 - 47 m/s). In addition, ‘Blo-Up’, a component within the Hybrid Stress Blast Model (HSBM), was used to model the blasting results. The ob-jective was to show that reasonable predictions of fragmentation and burden movement under confined conditions can be made. An unconfined reference experiment was used to calibrate Blo-Up and forward predictions of the confined case were made. In both cases, Blo-Up accurately reproduced the burden velocity and displacement observed in the experiments. The suggested measurement concept could be used for further measurements of confined burden movement in filled drift wall blasting tests and under controlled situations. As mentioned the final objective is instrumentation of the burden in SLC production rings.

Place, publisher, year, edition, pages
Boca Raton, Fla.: CRC Press/Balkema, 2012
National Category
Other Civil Engineering
Research subject
Mining and Rock Engineering
Identifiers
urn:nbn:se:ltu:diva-33070 (URN)7d58b9de-2c13-4c69-b71a-a298d042a5a8 (Local ID)978-0-415-62143-4 (ISBN)978-0-203-38767-2 (ISBN)7d58b9de-2c13-4c69-b71a-a298d042a5a8 (Archive number)7d58b9de-2c13-4c69-b71a-a298d042a5a8 (OAI)
Conference
International Symposium on Rock Fragmentation by Blasting : 24/11/2012 - 29/11/2012
Note
Godkänd; 2012; 20121112 (matwim)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-25Bibliographically approved
Schimek, P., Ouchterlony, F. & Moser, P. (2012). Experimental blast fragmentation research in model-scale bench blasts (ed.). In: (Ed.), J A Sanchidrián; A K Singh (Ed.), Measurement and Analysis of Blast Fragmentation: . Paper presented at International Symposium on Rock Fragmentation by Blasting : 24/11/2012 - 29/11/2012 (pp. 51-60). Boca Raton, Fla.: CRC Press/Balkema
Open this publication in new window or tab >>Experimental blast fragmentation research in model-scale bench blasts
2012 (English)In: Measurement and Analysis of Blast Fragmentation / [ed] J A Sanchidrián; A K Singh, Boca Raton, Fla.: CRC Press/Balkema , 2012, p. 51-60Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
Boca Raton, Fla.: CRC Press/Balkema, 2012
National Category
Other Civil Engineering
Research subject
Mining and Rock Engineering
Identifiers
urn:nbn:se:ltu:diva-32224 (URN)6a6569c6-7641-4f0d-8165-427440c959a9 (Local ID)978-0-415-62140-3 (ISBN)978-0-203-38753-5 (ISBN)6a6569c6-7641-4f0d-8165-427440c959a9 (Archive number)6a6569c6-7641-4f0d-8165-427440c959a9 (OAI)
Conference
International Symposium on Rock Fragmentation by Blasting : 24/11/2012 - 29/11/2012
Note
Godkänd; 2012; 20130107 (finn)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-25Bibliographically approved
Petropoulos, N., Johansson, D. & Ouchterlony, F. (2012). Fragmentation under different confinement conditions and the burden behaviour: small scale tests (ed.). In: (Ed.), Jose A. Sanchidrian Blanco; Ashok Kumar Singh (Ed.), Measurement and Analysis of Blast Fragmentation: Workshop Hosted by FRAGBLAST 10 - The 10th International Symposium on Rock Fragmentation by Blasting. Paper presented at International Symposium on Rock Fragmentation by Blasting : 24/11/2012 - 29/11/2012 (pp. 61-70). Boca Raton, Fla.: CRC Press/Balkema
Open this publication in new window or tab >>Fragmentation under different confinement conditions and the burden behaviour: small scale tests
2012 (English)In: Measurement and Analysis of Blast Fragmentation: Workshop Hosted by FRAGBLAST 10 - The 10th International Symposium on Rock Fragmentation by Blasting / [ed] Jose A. Sanchidrian Blanco; Ashok Kumar Singh, Boca Raton, Fla.: CRC Press/Balkema , 2012, p. 61-70Conference paper, Published paper (Refereed)
Abstract [en]

Small scale-tests have been performed on magnetic mortar blocks to investigate the influence of delay times, specific charge and firing pattern on fragmentation both when the burden is free and when confined by debris simulating the confined conditions of a SLC-blast ring and to study the burden behavior during blasting by implementing dynamic methods of measurements. The dimensions of the test blocks were 660 ×270 ×210 mm (L ×W ×H). Two different blast hole patterns, 2 rows with 5 holes with a burden of 70 mm (S/B ×1.6) and 3 rows with 7 holes with a burden of 58.3 mm (S/B ×1.4). A complete analysis regarding the influence of different delay times ranging from 0 to 4.1 ms/m of burden, different specific charges and different firing patterns on fragmentation has been made, based upon 22 blocks.

Place, publisher, year, edition, pages
Boca Raton, Fla.: CRC Press/Balkema, 2012
National Category
Other Civil Engineering
Research subject
Mining and Rock Engineering
Identifiers
urn:nbn:se:ltu:diva-31539 (URN)5c14b04f-15e8-4dc2-8076-0961872e086e (Local ID)978-0-415-62140-3 (ISBN)978-0-203-38753-5 (ISBN)5c14b04f-15e8-4dc2-8076-0961872e086e (Archive number)5c14b04f-15e8-4dc2-8076-0961872e086e (OAI)
Conference
International Symposium on Rock Fragmentation by Blasting : 24/11/2012 - 29/11/2012
Note
Godkänd; 2012; 20121203 (ysko)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2018-04-16Bibliographically approved
Sanchidrián, J. A., Lopéz, L. M., Segarra, P., Ouchterlony, F. & Moser, P. (2012). On the performance of truncated distributions to describe rock fragmentation (ed.). In: (Ed.), J A Sanchidrián; A K Singh (Ed.), Measurement and Analysis of Blast Fragmentation: . Paper presented at International Symposium on Rock Fragmentation by Blasting : 24/11/2012 - 29/11/2012 (pp. 87-96). Boca Raton, Fla.: CRC Press, Taylor & Francis Group
Open this publication in new window or tab >>On the performance of truncated distributions to describe rock fragmentation
Show others...
2012 (English)In: Measurement and Analysis of Blast Fragmentation / [ed] J A Sanchidrián; A K Singh, Boca Raton, Fla.: CRC Press, Taylor & Francis Group , 2012, p. 87-96Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
Boca Raton, Fla.: CRC Press, Taylor & Francis Group, 2012
National Category
Other Civil Engineering
Research subject
Mining and Rock Engineering
Identifiers
urn:nbn:se:ltu:diva-30388 (URN)42b9af1f-6027-4b1f-bd06-b39e3f4fff43 (Local ID)978-0-415-62140-3 (ISBN)978-0-203-38753-5 (ISBN)42b9af1f-6027-4b1f-bd06-b39e3f4fff43 (Archive number)42b9af1f-6027-4b1f-bd06-b39e3f4fff43 (OAI)
Conference
International Symposium on Rock Fragmentation by Blasting : 24/11/2012 - 29/11/2012
Note
Godkänd; 2012; 20130107 (finn)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-25Bibliographically approved
Sanchidrián, J. A., Ouchterlony, F., Moser, P., Segarra, P. & Lopéz, L. M. (2012). Performance of some distributions to describe rock fragmentation data (ed.). Paper presented at . International Journal of Rock Mechanics And Mining Sciences, 53, 18-31
Open this publication in new window or tab >>Performance of some distributions to describe rock fragmentation data
Show others...
2012 (English)In: International Journal of Rock Mechanics And Mining Sciences, ISSN 1365-1609, E-ISSN 1873-4545, Vol. 53, p. 18-31Article in journal (Refereed) Published
Abstract [en]

Ten functions (Weibull, Swebrec, Gilvarry, Grady and Lognormal, and their bi-component versions) are fitted to 448 sets of screened fragment size data from blasted and crushed rock. The ordinary least squares criterion has been used for the fits and two minimization techniques have been tested, in both cases running the problem repeatedly with different initial values of the unknown parameters in order to ensure a global minimum. There is a distinct behavior of errors across the passing range, which has been divided in four zones, coarse (>80%), central (80%–20%), fine (20%–2%) and very fine (<2%). The representation of fragmentation data by some of the distributions can be made with good accuracy in the coarse and central zones, with moderate accuracy in the fine zone and with considerably poor accuracy in the very fine zone. As expected, bi-component distributions generally perform better than the single-components, though there are important differences among them. Extended Swebrec is consistently the best fitting distribution in all zones, with maximum relative errors of less than 25% in the coarse, 15% in the central, and 50% in the fine zones. Bimodal Weibull, bimodal Gilvarry and bimodal Grady's errors are statistically equivalent to extended Swebrec's in the central and fine zones. In the very fine zone, relative errors have a high probability of being in excess of 100%, with maximum expected values being several times that, even for the best fitting functions in this zone. Swebrec is by far the best single component function in all zones, with errors comparable to the best bi-components in the coarse and central.

National Category
Other Civil Engineering
Research subject
Mining and Rock Engineering
Identifiers
urn:nbn:se:ltu:diva-10259 (URN)10.1016/j.ijrmms.2012.04.001 (DOI)90920718-fb75-4bfa-8b1f-bd191a2f684d (Local ID)90920718-fb75-4bfa-8b1f-bd191a2f684d (Archive number)90920718-fb75-4bfa-8b1f-bd191a2f684d (OAI)
Note
Upprättat; 2012; 20150610 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24Bibliographically approved
Organisations

Search in DiVA

Show all publications