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Publikationer (10 of 42) Visa alla publikationer
van Eldert, J., Schunnesson, H., Johansson, D. & Saiang, D. (2019). Application of Measurement While Drilling Technology to Predict Rock Mass Quality and Rock Support for Tunnelling. Rock Mechanics and Rock Engineering
Öppna denna publikation i ny flik eller fönster >>Application of Measurement While Drilling Technology to Predict Rock Mass Quality and Rock Support for Tunnelling
2019 (Engelska)Ingår i: Rock Mechanics and Rock Engineering, ISSN 0723-2632, E-ISSN 1434-453XArtikel i tidskrift (Refereegranskat) Epub ahead of print
Abstract [en]

A tunnelling project is normally initiated with a site investigation to determine the in situ rock mass conditions and to generate the basis for the tunnel design and rock support. However, since site investigations often are based on limited information (surface mapping, geophysical profiles, few bore holes, etc.), the estimation of the rock mass conditions may contain inaccuracies, resulting in underestimating the required rock support. The study hypothesised that these inaccuracies could be reduced using Measurement While Drilling (MWD) technology to assist in the decision-making process. A case study of two tunnels in the Stockholm bypass found the rock mass quality was severely overestimated by the site investigation; more than 45% of the investigated sections had a lower rock mass quality than expected. MWD data were recorded in 25 m grout holes and 6 m blast holes. The MWD data were normalised so that the long grout holes with larger hole diameters and the shorter blast holes with smaller hole diameters gave similar results. With normalised MWD data, it was possible to mimic the tunnel contour mapping; results showed good correlation with mapped Q-value and installed rock support. MWD technology can improve the accuracy of forecasting the rock mass ahead of the face. It can bridge the information gap between the early, somewhat uncertain geotechnical site investigation and the geological mapping done after excavation to optimise rock support.

Ort, förlag, år, upplaga, sidor
Springer, 2019
Nyckelord
Measurement while drilling (MWD), Rock mass investigation, Tunnelling, Rock mass quality, Rock support, Drill and blast technology
Nationell ämneskategori
Mineral- och gruvteknik Infrastrukturteknik Byggproduktion Geoteknik Annan samhällsbyggnadsteknik
Forskningsämne
Gruv- och berganläggningsteknik
Identifikatorer
urn:nbn:se:ltu:diva-76382 (URN)10.1007/s00603-019-01979-2 (DOI)000489294700001 ()
Forskningsfinansiär
Stiftelsen Bergteknisk Forskning (BeFo), 344
Tillgänglig från: 2019-10-14 Skapad: 2019-10-14 Senast uppdaterad: 2019-10-28
Mertuszka, P., Szumny, M., Wawryszewicz, A., Fuławka, K. & Saiang, D. (2019). Blasting delay pattern development in the light of rockburst prevention: Case study from polish copper mine. In: M. Tyulenev, S. Zhironkin, A. Khoreshok, S. Vöth, M. Cehlár, D. Nuray, J. Janocko, S. Anyona, Y. Tan, A. Abay, D. Marasová and P. Stefanek (Ed.), E3S Web of Conferences: IVth International Innovative Mining Symposium. Paper presented at 14th International Innovative Mining Symposium, IIMS 2019; Kemerovo, Russian Federation, October 14-16, 2019.. EDP Sciences, 105, Article ID 01012.
Öppna denna publikation i ny flik eller fönster >>Blasting delay pattern development in the light of rockburst prevention: Case study from polish copper mine
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2019 (Engelska)Ingår i: E3S Web of Conferences: IVth International Innovative Mining Symposium / [ed] M. Tyulenev, S. Zhironkin, A. Khoreshok, S. Vöth, M. Cehlár, D. Nuray, J. Janocko, S. Anyona, Y. Tan, A. Abay, D. Marasová and P. Stefanek, EDP Sciences, 2019, Vol. 105, artikel-id 01012Konferensbidrag, Publicerat paper (Refereegranskat)
Abstract [en]

In order to reduce the risk of induced seismicity related to underground mining, a number of preventive actions are applied in the form of passive and active prevention methods. The former are mainly of an organisational nature and their effectiveness is usually considered in the long term, while the active methods are mostly based on the detonation of explosives and are aimed to release the seismic energy accumulated in the rock mass. In this paper, modifications of the firing pattern aimed to concentrate the paraseismic vibrations while maintaining the appropriate excavation of the mining face has been verified on the basis of underground tests. The evaluation was based on fragmentation analysis. The obtained results confirmed, that the blasting pattern modifications related to the reducing of the face firing time do not cause significant differences in terms of the appropriate excavation of the mining face.

Ort, förlag, år, upplaga, sidor
EDP Sciences, 2019
Serie
E3S Web of Conferences, ISSN 2555-0403 ; 105
Nyckelord
Copper mines, Detonation, Induced Seismicity
Nationell ämneskategori
Annan samhällsbyggnadsteknik
Forskningsämne
Gruv- och berganläggningsteknik
Identifikatorer
urn:nbn:se:ltu:diva-75633 (URN)10.1051/e3sconf/201910501012 (DOI)
Konferens
14th International Innovative Mining Symposium, IIMS 2019; Kemerovo, Russian Federation, October 14-16, 2019.
Tillgänglig från: 2019-08-21 Skapad: 2019-08-21 Senast uppdaterad: 2019-08-21Bibliografiskt granskad
Svartsjaern, M. & Saiang, D. (2017). Discrete Element Modelling of Footwall Rock Mass Damage Induced by Sub-Level Caving at the Kiirunavaara Mine. Minerals, 7(7), Article ID 109.
Öppna denna publikation i ny flik eller fönster >>Discrete Element Modelling of Footwall Rock Mass Damage Induced by Sub-Level Caving at the Kiirunavaara Mine
2017 (Engelska)Ingår i: Minerals, ISSN 2075-163X, E-ISSN 2075-163X, Vol. 7, nr 7, artikel-id 109Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The Kiirunavaara mine is one of the largest sub-level-caving (SLC) mines in the worldand has been in underground operation for more than 50 years. The mine has been the focus ofseveral case studies over the years. The previous works have either focused on the caving of thehanging wall, using the footwall as a passive support, or focused on the footwall using the hangingwall to apply a passive load. In this updated study the findings of the previous case studies arecombined to study the interaction between the caving hanging wall, the developing cave rock zoneand the footwall. The geological data for the rock types in the mine area are used to derive upperand lower limits for the geomechanical parameters calibrated for numerical models in the previousstudies. The calibrated parameters are used as inputs to a numerical model constructed usingItasca’s Particle-flow-code (PFC) encompassing a mine-scale 2D section at the mid portion of themine. The model captures the failure locations well in the footwall underground and indicatesdamage development without a coherent large-scale failure. The trend in subsidence data on thehanging wall is adequately simulated but the magnitude of deformation is underestimated. Theinput strength for the hanging wall was lowered to study the impact of hanging wall strength onfootwall damage development. It is shown that when the footwall strength is kept constant, whilelowering the hanging wall strength, the extent of damage and magnitude of displacements in thefootwall increases. From these observations it is argued that the hanging wall and footwall cannotbe studied independently for the Kiirunavaara mine since the cave rock zone significantly affectsthe damage development in both walls.

Ort, förlag, år, upplaga, sidor
MDPI, 2017
Nationell ämneskategori
Mineral- och gruvteknik Annan samhällsbyggnadsteknik
Forskningsämne
Gruv- och Berganläggningsteknik
Identifikatorer
urn:nbn:se:ltu:diva-64484 (URN)10.3390/min7070109 (DOI)000407363800003 ()2-s2.0-85021436574 (Scopus ID)
Anmärkning

Validerad;2017;Nivå 2;2017-07-06 (andbra)

Tillgänglig från: 2017-06-26 Skapad: 2017-06-26 Senast uppdaterad: 2018-07-10Bibliografiskt granskad
Saiang, D. & Nordlund, E. (2017). Numerical Analyses of Field Monitoring in Stope J10-3 at Kristineberg Mine. Luleå: Luleå University of Technology
Öppna denna publikation i ny flik eller fönster >>Numerical Analyses of Field Monitoring in Stope J10-3 at Kristineberg Mine
2017 (Engelska)Rapport (Refereegranskat)
Ort, förlag, år, upplaga, sidor
Luleå: Luleå University of Technology, 2017. s. 61
Serie
Teknisk rapport / Luleå tekniska universitet, ISSN 1402-1536
Nationell ämneskategori
Teknik och teknologier Annan samhällsbyggnadsteknik
Forskningsämne
Gruv- och Berganläggningsteknik
Identifikatorer
urn:nbn:se:ltu:diva-62761 (URN)978-91-7583-857-1 (ISBN)
Tillgänglig från: 2017-03-28 Skapad: 2017-03-28 Senast uppdaterad: 2018-04-16Bibliografiskt granskad
Idris, M. A., Nordlund, E. & Saiang, D. (2016). Comparison of different probabilistic methods for analyzing stability of underground rock excavations. The Electronic journal of geotechnical engineering, 21(21), 6555-6585
Öppna denna publikation i ny flik eller fönster >>Comparison of different probabilistic methods for analyzing stability of underground rock excavations
2016 (Engelska)Ingår i: The Electronic journal of geotechnical engineering, ISSN 1089-3032, E-ISSN 1089-3032, Vol. 21, nr 21, s. 6555-6585Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Stability analyses of underground rock excavations are often performed using traditional deterministic methods. In deterministic methods the mean or characteristics values of the input parameters are used for the analyses. These method neglect the inherent variability of the rock mass properties in the analyses and the results could be misleading. Therefore, for a realistic stability analyses probabilistic methods, which consider the inherent variability of the rock mass properties, are considered appropriate. A number of probabilistic methods, each based on different theories and assumptions have been developed for the analysis of geotechnical problems. Geotechnical engineers must therefore choose appropriate probabilistic method to achieve a specific objective while taking into account simplicity, accuracy and time efficiency. In this study finite difference method was combined with five different probabilistic methods to analyze the stability of an underground rock excavation. The probabilistic methods considered were the Point Estimate Method (PEM), the Response Surface Method (RSM), the Artificial Neural Network (ANN), the Monte Carlos Simulation (MCS), and the Strength Classification Method (SCM). The results and the relative merits of the methods were compared. Also the general advantages of the probabilistic method over the deterministic method were discussed. Though the methods presented in this study are not exhaustive, the results of this study will assist in the choice of appropriate probabilistic methods for the analysis of underground rock excavations. 

Ort, förlag, år, upplaga, sidor
Mete Öner, 2016
Nationell ämneskategori
Annan samhällsbyggnadsteknik
Forskningsämne
Gruv- och berganläggningsteknik
Identifikatorer
urn:nbn:se:ltu:diva-59926 (URN)2-s2.0-84992509213 (Scopus ID)
Anmärkning

Validerad; 2016; Nivå 2; 2016-11-14 (andbra)

Tillgänglig från: 2016-10-24 Skapad: 2016-10-24 Senast uppdaterad: 2018-11-23Bibliografiskt granskad
Svartsjaern, M., Saiang, D., Nordlund, E. & Eitzenberger, A. (2016). Conceptual Numerical Modeling of Large-Scale Footwall Behavior at the Kiirunavaara Mine, and Implications for Deformation Monitoring (ed.). Paper presented at . Rock Mechanics and Rock Engineering, 49(3), 943-960
Öppna denna publikation i ny flik eller fönster >>Conceptual Numerical Modeling of Large-Scale Footwall Behavior at the Kiirunavaara Mine, and Implications for Deformation Monitoring
2016 (Engelska)Ingår i: Rock Mechanics and Rock Engineering, ISSN 0723-2632, E-ISSN 1434-453X, Vol. 49, nr 3, s. 943-960Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Over the last 30 years the Kiirunavaara mine has experienced a slow but progressive fracturing and movement in the footwall rock mass which is directly related to the sublevel caving (SLC) method utilized by Luossavaara-Kiirunavaara Aktiebolag (LKAB). As part of an on-going work, this paper focuses on describing and explaining a likely evolution path of large-scale fracturing in the Kiirunavaara footwall. The trace of this fracturing was based on a series of damage mapping campaigns carried out over the last two years, accompanied by numerical modelling. Data collected from the damage mapping between mine levels 320 and 907 m was used to create a 3D surface representing a conceptual boundary for the extent of the damaged volume. The extent boundary surface was used as the basis for calibrating conceptual numerical models created in UDEC. The mapping data, in combination with the numerical models, indicated a plausible evolution path of the footwall fracturing that was subsequently described. Between levels 320 and 740 m the extent of fracturing into the footwall appears to be controlled by natural pre-existing discontinuities, while below 740 m there are indications of a curved shear or step-path failure. The step-path is hypothesised to be activated by rock mass heave into the SLC zone above the current extraction level. Above the 320 m level the fracturing seems to intersect a sub-vertical structure that daylights in the old open pit slope. Identification of these probable damage mechanisms was an important step in order to determine the requirements for a monitoring system for tracking footwall damage. This paper describes the background work for design of the system currently being installed.

Nationell ämneskategori
Annan samhällsbyggnadsteknik
Forskningsämne
Gruv- och Berganläggningsteknik
Identifikatorer
urn:nbn:se:ltu:diva-10894 (URN)10.1007/s00603-015-0750-x (DOI)000371313300014 ()2-s2.0-84959154826 (Scopus ID)9c57e456-e493-4fed-a105-98f1373c0678 (Lokalt ID)9c57e456-e493-4fed-a105-98f1373c0678 (Arkivnummer)9c57e456-e493-4fed-a105-98f1373c0678 (OAI)
Anmärkning
Validerad; 2016; Nivå 2; 20150527 (miknil)Tillgänglig från: 2016-09-29 Skapad: 2016-09-29 Senast uppdaterad: 2018-07-10Bibliografiskt granskad
Saiang, D. & Nordlund, E. (2016). Ground support modelling involving large ground deformation: Simulation of conceptual cases – Part 2. In: Proceedings of the 8th International Symposium on Ground Support in Mining and Underground Construction: . Paper presented at Ground Support 2016 : 11/09/2016 - 14/09/2016.
Öppna denna publikation i ny flik eller fönster >>Ground support modelling involving large ground deformation: Simulation of conceptual cases – Part 2
2016 (Engelska)Ingår i: Proceedings of the 8th International Symposium on Ground Support in Mining and Underground Construction, 2016Konferensbidrag, Publicerat paper (Refereegranskat)
Abstract [en]

As a continuation of Part 1 of ground support modelling involving large ground deformation by Saiang and Nordlund (2016) this paper presents the conceptual models and results from the typically observed cases throughout the Kristineberg mine. The Part 1 of the paper focused primarily on results from measurements carried out at the J-orebody, whereas the Kristineberg mine consists of many ore bodies or lenses within the VMS (volcanic massive sulphides). Part 2 therefore presents some of the typically observed rock mass behaviours throughout the mine. The mine geology is very complex for each of the orebody due to the multiple phases of wall rock alterations and various geological processes that occurred throughout the history of the deposit. This history also included both local and regional events of folding, faulting and shearing. Despite the notable differences in the local geology around the different orebodies, there is nevertheless, a general trend that the stability of the stopes throughout the mine are in principal controlled by the altered wall rocks, the presence of other lithologies capable of inhibiting deformation and the geometry of the stopes themselves as demonstrated in Part 1.

Nationell ämneskategori
Annan samhällsbyggnadsteknik
Forskningsämne
Gruv- och Berganläggningsteknik
Identifikatorer
urn:nbn:se:ltu:diva-61863 (URN)
Konferens
Ground Support 2016 : 11/09/2016 - 14/09/2016
Tillgänglig från: 2017-02-07 Skapad: 2017-02-07 Senast uppdaterad: 2018-04-16Bibliografiskt granskad
Saiang, D. & Nordlund, E. (2016). Ground support modelling involving large ground deformation: Simulation of field observations – Part 1. In: E . Nordlund, T.H. Jones and A. Eitzenberger (eds) (Ed.), Proceedings of the 8th International Symposium on Ground Support in Mining and Underground Construction: . Paper presented at Ground Support 2016 : 11/09/2016 - 14/09/2016.
Öppna denna publikation i ny flik eller fönster >>Ground support modelling involving large ground deformation: Simulation of field observations – Part 1
2016 (Engelska)Ingår i: Proceedings of the 8th International Symposium on Ground Support in Mining and Underground Construction / [ed] E . Nordlund, T.H. Jones and A. Eitzenberger (eds), 2016Konferensbidrag, Publicerat paper (Refereegranskat)
Abstract [en]

The Kristineberg mine has a long history of large ground deformation which consequently incites ground control problems for the mine. Over the years the mine has developed various mining techniques, backfilling and ground support procedures to manage this problem. In general the ground control problems at the mine are highly influenced by the wall rock geology. The wall rock, that is the footwall and hanging wall, comprise of highly altered chlorite schist, which are internally referred to as talc-schist. They very often occur as seams with thickness barely ranging from 0.1 m to as wide as 3.0 m. Coupled with high ground stresses the talc squeezes and slides into the stope if undercut by the excavation, or either bends or bulges inwards when exposed but not undercut depending on the loading direction. The deformation magnitudes have often been reported to be in the order of 0.2 to 0.5 m and seldom up to 1.0 m. Conventional rock support system, consisting of fibre re-enforced shotcrete and rebar rock bolts, has regularly failed under these conditions. As part of Ground Support Research Initiative at Luleå University of Technology a monitoring program was designed to measure ground deformation and the response of the ground support system. Numerical modelling was conducted to capture the responses as observed during monitoring. The numerical models revealed all the typical mechanisms of instability that have been conceptualized through observations and earlier studies. Talc obviously was the most influential lithology that controlled the deformation characteristics of the stope and ultimately on the rock support system. Combinations of bending, bulging, shearing and tensile mechanisms induced a complex loading pattern on the rock support system. Often the rock bolts, for example, would experience all of these mechanisms at once or during different stages of the excavation rounds as a cut is developed.

Nationell ämneskategori
Annan samhällsbyggnadsteknik
Forskningsämne
Gruv- och Berganläggningsteknik
Identifikatorer
urn:nbn:se:ltu:diva-61862 (URN)
Konferens
Ground Support 2016 : 11/09/2016 - 14/09/2016
Tillgänglig från: 2017-02-07 Skapad: 2017-02-07 Senast uppdaterad: 2018-04-16Bibliografiskt granskad
Svartsjaern, M., Saiang, D. & Mäkitaavola, K. (2016). Underground Footwall Monitoring at the Sublevel Caving Mine – Kiirunavaara, Sweden (ed.). In: (Ed.), (Ed.), Seventh International Conference & Exhibition on Mass Mining: (MassMin 2016). Paper presented at International Conference & Exhibition on Mass Mining : 09/05/2016 - 11/05/2016 (pp. 773-780). Sydney: The Australian Institute of Mining and Metallurgy
Öppna denna publikation i ny flik eller fönster >>Underground Footwall Monitoring at the Sublevel Caving Mine – Kiirunavaara, Sweden
2016 (Engelska)Ingår i: Seventh International Conference & Exhibition on Mass Mining: (MassMin 2016), Sydney: The Australian Institute of Mining and Metallurgy , 2016, s. 773-780Konferensbidrag, Publicerat paper (Refereegranskat)
Abstract [en]

The Kiirunavaara mine is a large-scale (28 Mt per annum) iron ore mine located in northern Sweden. The mine is owned and operated by Luossavaara-Kiirunavaara Aktiebolag (LKAB) using sublevel caving (SLC). The SLC area underlies an open pit decommissioned in the 1950s, the current main SLC haulage level is situated at an depth of 1100 m. The main orebody dips 60 degrees to the east with a distinct boundary defining the hanging wall to the east and footwall to the west. Since the 1980s damage has been observed both in the footwall rock mass as well as on the footwall crest of the open pit. Recent investigations indicate that the underground footwall damage is primarily controlled by large-scale slope failure mechanisms. Structurally controlled near-vertical planar shear failures in the upper footwall appear to be driven or facilitated by a step-path like curved shear failure situated in a zone starting ca 250 m, and intersecting the SLC about 100 m above the active mining level. To confirm this failure evolution a pilot underground measuring system has been designed and installed to monitor the expected rock mass displacements indicated by numerical models based on the above mechanisms. The systems consists of 50 m time domain reflectometry (TDR) coaxial cables installed in the footwall both across and away from an estimated damage extent boundary to monitor shear movements along natural joint surfaces. The TDR installation is combined with long extensometers to facilitate differentiation between diffuse shear and rock mass normal expansion. Additionally, a low-tech system of tape extensometer lines are installed in drifts and stopes running perpendicular to the ore strike to monitor horizontal displacements in the infrastructure as the footwall ‘slope’ loses confinement during mining advance when the mined out areas are replaced by caved rock from the hanging wall.

Ort, förlag, år, upplaga, sidor
Sydney: The Australian Institute of Mining and Metallurgy, 2016
Nationell ämneskategori
Annan samhällsbyggnadsteknik
Forskningsämne
Gruv- och Berganläggningsteknik
Identifikatorer
urn:nbn:se:ltu:diva-29284 (URN)2b4bf3f0-1153-45c7-861c-0a434e8324ad (Lokalt ID)9781925100433 (ISBN)2b4bf3f0-1153-45c7-861c-0a434e8324ad (Arkivnummer)2b4bf3f0-1153-45c7-861c-0a434e8324ad (OAI)
Konferens
International Conference & Exhibition on Mass Mining : 09/05/2016 - 11/05/2016
Anmärkning
Godkänd; 2016; 20160401 (miknil)Tillgänglig från: 2016-09-30 Skapad: 2016-09-30 Senast uppdaterad: 2018-04-16Bibliografiskt granskad
Nordlund, E., Zhang, P., Dineva, S., Saiang, D. & Mainali, G. (2015). Impact of fire on the stability of hard rock tunnels in Sweden (ed.). Paper presented at . Stockholm: Stiftelsen bergteknisk forskning - Befo
Öppna denna publikation i ny flik eller fönster >>Impact of fire on the stability of hard rock tunnels in Sweden
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2015 (Engelska)Rapport (Refereegranskat)
Ort, förlag, år, upplaga, sidor
Stockholm: Stiftelsen bergteknisk forskning - Befo, 2015. s. 113
Serie
Svebefo rapport, ISSN 1104-1773 ; 136
Nationell ämneskategori
Annan samhällsbyggnadsteknik
Forskningsämne
Gruv- och Berganläggningsteknik
Identifikatorer
urn:nbn:se:ltu:diva-21758 (URN)00239a3a-38f2-48c9-b75a-9fd1ab5a5c19 (Lokalt ID)00239a3a-38f2-48c9-b75a-9fd1ab5a5c19 (Arkivnummer)00239a3a-38f2-48c9-b75a-9fd1ab5a5c19 (OAI)
Anmärkning
Godkänd; 2015; 20150518 (andbra)Tillgänglig från: 2016-09-29 Skapad: 2016-09-29 Senast uppdaterad: 2018-04-16Bibliografiskt granskad
Organisationer
Identifikatorer
ORCID-id: ORCID iD iconorcid.org/0000-0001-8001-9745

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