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Publications (10 of 34) Show all publications
Yi, C., Johansson, D., Wimmer, M., Nordqvist, A., Greberg, J. & Rodriguez San Miguel, C. (2024). Numerical Simulation of Gravity Flow in Sublevel Caving Based on Polyhedron DEM. Mining, Metallurgy and Exploration, 41(1), 91-98
Open this publication in new window or tab >>Numerical Simulation of Gravity Flow in Sublevel Caving Based on Polyhedron DEM
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2024 (English)In: Mining, Metallurgy and Exploration, ISSN 2524-3462, Vol. 41, no 1, p. 91-98Article in journal (Refereed) Published
Abstract [en]

The gravity flow behavior of blasted ore and caved waste in sublevel caving (SLC) mines is complex. The shape of fragmented ore and caved waste is identified as one of the principal factors influencing the gravity flow of ore. To investigate the effect of the particle shapes on the gravity flow, a code was developed to generate polyhedral fragments in different shapes and divide them into internal elements. Then these fragments were imported in the LS-DYNA code to generate SLC models containing blasted ore and caved waste and model the extraction process. To model the non-continuous loading process, the gravity flow was considered to be an intermittent process by setting a switcher at the extraction point. The flow behavior of ore from the numerical modeling is in agreement with the experimental results. The cumulative dilution of ore by waste is up to around 30%, which agrees with the results of the field survey.

Place, publisher, year, edition, pages
Springer Nature, 2024
Keywords
Cumulative dilution, Gravity flow, Polyhedron DEM, Sublevel caving
National Category
Geotechnical Engineering
Research subject
Mining and Rock Engineering; Centre - Centre for Advanced Mining & Metallurgy (CAMM)
Identifiers
urn:nbn:se:ltu:diva-103469 (URN)10.1007/s42461-023-00903-1 (DOI)001129278500001 ()2-s2.0-85180172471 (Scopus ID)
Projects
I2mine
Note

Validerad;2024;Nivå 2;2024-02-23 (hanlid);

Funder: 7th Framework Programme, EU;

Full text license: CC BY

Available from: 2024-01-04 Created: 2024-01-04 Last updated: 2024-03-07Bibliographically approved
San Miguel, C. R., Petropoulos, N., Stenman, U., Yi, C. & Johansson, D. (2023). Development of a methodology for measuring crack growth by blasting using non-contact techniques. In: Holmberg, R. et al. (Ed.), 12th World Conference on Explosives and Blasting: Dublin Conference Proceedings 2023: . Paper presented at EFEE 12th World Conference on Explosives and Blasting, Dublin, Ireland, September 9-12, 2023 (pp. 45-54). European Federation of Explosives Engineers
Open this publication in new window or tab >>Development of a methodology for measuring crack growth by blasting using non-contact techniques
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2023 (English)In: 12th World Conference on Explosives and Blasting: Dublin Conference Proceedings 2023 / [ed] Holmberg, R. et al., European Federation of Explosives Engineers , 2023, , p. 45-54p. 45-54Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
European Federation of Explosives Engineers, 2023. p. 45-54
National Category
Other Civil Engineering
Research subject
Mining and Rock Engineering; Centre - Swedish Blasting Research Centre (SWEBREC)
Identifiers
urn:nbn:se:ltu:diva-101765 (URN)
Conference
EFEE 12th World Conference on Explosives and Blasting, Dublin, Ireland, September 9-12, 2023
Funder
Rock Engineering Research Foundation (BeFo), 427
Note

ISBN for host publication: 978-0-9550290-8-0

Available from: 2023-10-24 Created: 2023-10-24 Last updated: 2024-02-14Bibliographically approved
Warema, S., Shirzadegan, S., Nordlund, E., Yi, C. & Lanaro, F. (2023). Numerical Analysis of the Sensitivity of Joint Parameters to the Cross-cut in Response of Dynamic Loading. In: Haraldur Sigursteinsson; Atli Karl Ingimarsson (Ed.), Proceedings of the NROCK 2023: The IV Nordic Symposium onRock Mechanics and Rock Engineering. Paper presented at The IV Nordic Symposium on Rock Mechanics and Rock Engineering, May 24-26, 2023, Reykjavik, Iceland (pp. 85-96). IGS & ITS
Open this publication in new window or tab >>Numerical Analysis of the Sensitivity of Joint Parameters to the Cross-cut in Response of Dynamic Loading
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2023 (English)In: Proceedings of the NROCK 2023: The IV Nordic Symposium onRock Mechanics and Rock Engineering / [ed] Haraldur Sigursteinsson; Atli Karl Ingimarsson, IGS & ITS , 2023, p. 85-96Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
IGS & ITS, 2023
National Category
Mineral and Mine Engineering
Research subject
Mining and Rock Engineering
Identifiers
urn:nbn:se:ltu:diva-103112 (URN)10.33112/nrock2023.8 (DOI)978-9935-9436-2-0 (ISBN)
Conference
The IV Nordic Symposium on Rock Mechanics and Rock Engineering, May 24-26, 2023, Reykjavik, Iceland
Available from: 2023-11-30 Created: 2023-11-30 Last updated: 2024-02-09Bibliographically approved
Qiao, G., Liu, Z., Yi, C., Gao, K. & Xuan, G. (2023). Quantitative assessment of the effect of in-situ stresses on blast-induced damage to rock. Computers & structures, 287, Article ID 107116.
Open this publication in new window or tab >>Quantitative assessment of the effect of in-situ stresses on blast-induced damage to rock
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2023 (English)In: Computers & structures, ISSN 0045-7949, E-ISSN 1879-2243, Vol. 287, article id 107116Article in journal (Refereed) Published
Abstract [en]

In-situ stress significantly affects rock blast damage but there is a paucity of quantitative assessments of damage evolution in rocks affected by confining pressure. The present paper analyses the effect of envelope pressure on blast-induced rock damage through theoretical analysis and numerical simulations. Damage clouds obtained from numerical simulations are processed using image processing techniques. The concept of the damage variable () is proposed to facilitate the presentation of the image processing results. The damage variable is found to be negatively correlated with the hydrostatic pressure () at the same moment, in equiaxial in-situ stress fields. In contrast, in anisotropic in-situ stress fields,  is not negatively correlated with  due to the presence of hoop tensile stresses in the rock. The mathematical relationship between  and  in equiaxial and anisotropic stress fields are established. An anisotropic damage variable () is introduced to describe the effect of the anisotropy ratio () on rock damage, which is found to increase with increasing values of . The sharp increase in  equal to 4 and 5 is explained in terms of the state of the rock stress distribution under static loading. This study provides insights into the effect of in situ stress on rock blast damage and presents new approaches for analyzing and presenting the data.

Place, publisher, year, edition, pages
Elsevier Ltd, 2023
Keywords
Blasting, Damage evolution, Image processing, In-situ stress, Quantitative assessment
National Category
Other Civil Engineering
Research subject
Mining and Rock Engineering
Identifiers
urn:nbn:se:ltu:diva-99549 (URN)10.1016/j.compstruc.2023.107116 (DOI)001051061600001 ()2-s2.0-85166315932 (Scopus ID)
Note

Validerad;2023;Nivå 2;2023-08-14 (joosat);

Licens fulltext: CC BY License

Funder: Graduate Research Project of Anhui Education Department (YJS20210396); National Natural Science Foundation of China (52074013); Natural Science Foundation of Anhui Province (2208085ME125)

Available from: 2023-08-14 Created: 2023-08-14 Last updated: 2024-03-07Bibliographically approved
Ye, Z., Chen, M., Yi, C., Lu, W. & Yan, P. (2023). Quantitative Study of the Action on Rock Mass Failure under the Shock Wave and Gas Pressure in Bench Blasting. International Journal of Geomechanics, 23(9), Article ID 04023135.
Open this publication in new window or tab >>Quantitative Study of the Action on Rock Mass Failure under the Shock Wave and Gas Pressure in Bench Blasting
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2023 (English)In: International Journal of Geomechanics, ISSN 1532-3641, E-ISSN 1943-5622, Vol. 23, no 9, article id 04023135Article in journal (Refereed) Published
Abstract [en]

The expansion and shock wave coexisting failure theory has been widely recognized. However, it is not clear whether the main cause of rock mass blasting failure is the shock wave or gas pressure. In this paper, the contribution proportions of both loads to rock mass failure were investigated in bench blasting. First, the blasting damage in rock mass was simulated with a fluid-structure interaction (FSI) method. Then, a novel method to quantitatively distinguish between the rock-breaking effects (RBEs) of the shock wave and gas pressure was proposed that was based on the damage results. In addition, under different free surface conditions, the blasting failure volume that was caused by both loads was obtained for three typical rock masses, which included poor, middle, and good rock masses. The results showed that the range of the tensile failure zone by reflected waves was small, and the favorable effects of free surfaces on the failure induced by shock waves were limited. The free surface had a minor beneficial influence on the rock mass failure that was induced by the shock waves. In addition, it had a more favorable influence on the failure that was induced by the gas pressure. Finally, the influence of the free surface and rock mass conditions on the contribution proportions of both loads was discussed. A higher proportion of the RBEs of the shock wave was in the good mass with large wave impedance compared with the poor rock mass with small wave impedance. According to the contribution proportions under different rock masses and free surface conditions, the main cause of rock blasting failure was the gas pressure action, which was verified through the field high-speed photography data. The findings revealed the main cause of rock mass failure in bench blasting and could provide a theoretical basis when seeking effective engineering measures to give full play to the gas pressure action.

Place, publisher, year, edition, pages
American Society of Civil Engineers (ASCE), 2023
Keywords
Contribution proportion, Failure volume, Free surface, Gas pressure, Shock wave
National Category
Other Civil Engineering
Research subject
Mining and Rock Engineering
Identifiers
urn:nbn:se:ltu:diva-99427 (URN)10.1061/IJGNAI.GMENG-8175 (DOI)001030064800007 ()2-s2.0-85163701083 (Scopus ID)
Note

Validerad;2023;Nivå 2;2023-08-10 (joosat);

Funder: National Natural Science Foundation of China (Grant No. 51979205; No. 51779193)

Available from: 2023-08-10 Created: 2023-08-10 Last updated: 2024-03-07Bibliographically approved
Yi, C., Iravani, A., Gómez, S., Johansson, D., Schunnesson, H. & Wimmer, M. (2023). Voronoi-based numerical investigation of fragmentation and gravity flow of SLC. In: : . Paper presented at ISEE 49th Annual Conference on Explosives and Blasting Technique, Sant Antonio, Texas, USA, February 4-8, 2023.
Open this publication in new window or tab >>Voronoi-based numerical investigation of fragmentation and gravity flow of SLC
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2023 (English)Conference paper, Published paper (Refereed)
National Category
Geotechnical Engineering
Research subject
Mining and Rock Engineering
Identifiers
urn:nbn:se:ltu:diva-101614 (URN)
Conference
ISEE 49th Annual Conference on Explosives and Blasting Technique, Sant Antonio, Texas, USA, February 4-8, 2023
Projects
illuMINEation
Funder
EU, Horizon 2020, 869379Luleå University of Technology
Note

Funder: Swedish Mining innovation (SMI); LKAB Stiftels, Centre of Advanced Mining & Metallurgy (CAMM3); Swedish blasting research centre (Swebrec)

Available from: 2023-10-10 Created: 2023-10-10 Last updated: 2024-02-05Bibliographically approved
Yi, C., Johansson, D., Petropoulos, N. & Schunnesson, H. (2022). Experimental and Numerical Investigation of the Effects of Jointing on Fragmentation. In: Proceedings of the 48th Annual Conference on Explosives and Blasting Technique: . Paper presented at 48th Annual Conference on Explosives and Blasting Technique, Las Vegas, USA, January 28 - February 2, 2022.
Open this publication in new window or tab >>Experimental and Numerical Investigation of the Effects of Jointing on Fragmentation
2022 (English)In: Proceedings of the 48th Annual Conference on Explosives and Blasting Technique, 2022Conference paper, Published paper (Refereed)
National Category
Geotechnical Engineering
Research subject
Mining and Rock Engineering
Identifiers
urn:nbn:se:ltu:diva-101615 (URN)
Conference
48th Annual Conference on Explosives and Blasting Technique, Las Vegas, USA, January 28 - February 2, 2022
Projects
illuMINEation
Funder
EU, Horizon 2020, 869379Luleå University of TechnologyIngaBritt and Arne Lundberg’s Research Foundation
Note

Funder: Centre of Advanced Mining & Metallurgy (CAMM3); Swedish blasting research centre (Swebrec)

Available from: 2023-10-10 Created: 2023-10-10 Last updated: 2024-02-06Bibliographically approved
Yi, C., Johansson, D., Wimmer, M., Nordqvist, A. & Rodriguez San Miguel, C. (2022). Numerical modelling of fragmentation by blasting and gravity flow in sublevel caving mines. In: Yves Potvin (Ed.), Proceedings of the Fifth International Conference on Block and Sublevel Caving: Caving 2022. Paper presented at Fifth International Conference on Block and Sublevel Caving (Caving 2022), Adelaide, Australia, August 30 - September 1, 2022 (pp. 963-974). Australian Centre for Geomechanics, 2
Open this publication in new window or tab >>Numerical modelling of fragmentation by blasting and gravity flow in sublevel caving mines
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2022 (English)In: Proceedings of the Fifth International Conference on Block and Sublevel Caving: Caving 2022 / [ed] Yves Potvin, Australian Centre for Geomechanics , 2022, Vol. 2, p. 963-974Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
Australian Centre for Geomechanics, 2022
National Category
Geotechnical Engineering
Research subject
Mining and Rock Engineering
Identifiers
urn:nbn:se:ltu:diva-101616 (URN)10.36487/ACG_repo/2205_66 (DOI)
Conference
Fifth International Conference on Block and Sublevel Caving (Caving 2022), Adelaide, Australia, August 30 - September 1, 2022
Note

Funder: Swedish Mining innovation (SMI); LKAB Stiftelse; The Centre of Advanced Mining and Metallurgy (CAMM3) at the Luleå University of Technology;

ISBN ofr host publication:  978-0-6450938-3-4;

Available from: 2023-10-10 Created: 2023-10-10 Last updated: 2024-02-23Bibliographically approved
Zhang, Z.-X., Chi, L. Y. & Yi, C. (2021). An empirical approach for predicting burden velocities in rock blasting. Journal of Rock Mechanics and Geotechnical Engineering, 13(4), 767-773
Open this publication in new window or tab >>An empirical approach for predicting burden velocities in rock blasting
2021 (English)In: Journal of Rock Mechanics and Geotechnical Engineering, ISSN 1674-7755, Vol. 13, no 4, p. 767-773Article in journal (Refereed) Published
Abstract [en]

An analytical relation between burden velocity and ratio of burden to blasthole diameter is developed in this paper. This relation is found to be consistent with the measured burden velocities of all 37 full-scale blasts found from published articles. These blasts include single-hole blasts, multi-hole blasts, and simultaneously-initiated blasts with various borehole diameters such as 64 mm, 76 mm, 92 mm, 115 mm, 142 mm and 310 mm. All boreholes were fully charged. The agreement between measured and calculated burden velocities demonstrates that this relation can be used to predict the burden velocity of a wide range of full-scale blast with fully-coupled explosive charge and help to determine a correct delay time between adjacent holes or rows in various full-scale blasts involved in tunnelling (or drifting), surface and underground mining production blasts and underground opening slot blasts. In addition, this theoretical relation is found to agree with the measured burden velocities of 9 laboratory small-scale blasts to a certain extent. To predict the burden velocity of a small-scale blast, a further study or modification to the relation is necessary by using more small-scale blasts in the future.

Place, publisher, year, edition, pages
Elsevier, 2021
Keywords
burden velocity, rock blasting, kinetic energy, delay time, tunnelling, mining
National Category
Mineral and Mine Engineering
Research subject
Mining and Rock Engineering
Identifiers
urn:nbn:se:ltu:diva-84313 (URN)10.1016/j.jrmge.2021.04.004 (DOI)000672711100005 ()2-s2.0-85106478057 (Scopus ID)
Note

Validerad;2021;Nivå 2;2021-07-14 (johcin)

Available from: 2021-05-17 Created: 2021-05-17 Last updated: 2021-12-13Bibliographically approved
Chen, M., Wei, D., Yi, C., Lu, W. & Johansson, D. (2021). Failure mechanism of rock mass in bench blasting based on structural dynamics. Bulletin of Engineering Geology and the Environment, 80(9), 6841-6861
Open this publication in new window or tab >>Failure mechanism of rock mass in bench blasting based on structural dynamics
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2021 (English)In: Bulletin of Engineering Geology and the Environment, ISSN 1435-9529, E-ISSN 1435-9537, Vol. 80, no 9, p. 6841-6861Article in journal (Refereed) Published
Abstract [en]

This study establishes a multiple degrees-of-freedom structural dynamics analytical model to analyse the influence mechanism of different factors on blasting tight bottom and shape of muckpile. The structural displacement response and distribution of internal forces in the bench rock mass are analysed based on several factors including blasting parameters, explosion load, initiation condition, and geological condition. In addition, the structural failure characteristics of the bench rock mass are studied based on a rock strength criterion. The results indicate that the explosive load strength determines the internal forces of the bench rock mass. The use of blasting parameters with large borehole spacing and small row spacing can increase the internal force and deformation of the bench rock and enhance the effect of the breaking and throwing of rock mass. In addition, the strengthening of the lithology of the bottom rocks or weakening of the lithology of the middle rocks can make destroying the bottom rock mass more difficult and increase the probability of blasting tight bottom formation. Adjusting the initiation point to below the weak-lithology segment of the bench can enhance the internal force and displacement of the bottom rock mass, to improve the blasting effect and avoid blasting tight bottom formation. Combined with the bench blasting field test of the Changjiu limestone mine, it verifies the results of the theoretical analysis of the bench blasting rock mass destruction based on structural dynamics. The results can be used as the theoretical basis and technical support for improving the bench blasting effect. 

Place, publisher, year, edition, pages
Springer, 2021
Keywords
Bench blasting, Failure, Mining, Rock mass, Structural dynamics
National Category
Mineral and Mine Engineering
Research subject
Mining and Rock Engineering
Identifiers
urn:nbn:se:ltu:diva-86469 (URN)10.1007/s10064-021-02324-0 (DOI)000669179500003 ()2-s2.0-85109275261 (Scopus ID)
Note

Validerad;2021;Nivå 2;2021-09-01 (alebob);

Forskningsfinansiär: National Natural Science Foundation of China (51979205, 51779193)

Available from: 2021-07-27 Created: 2021-07-27 Last updated: 2021-08-30Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-5872-5173

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