Three-dimensional analysis of complex anisotropic slope instability at MMG’s Century Mine

Sainsbury, David; Sainsbury, Bre-Anne; Sweeney, Erin

doi:10.1080/14749009.2016.1163918

Cited by 10 publications

(5 citation statements)

References 19 publications

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“…e results of deformation measurements are values in the LOS direction [14], which are limited by the InSAR measurements themselves. To obtain the real 3D deformation information of the surface, it is necessary to use simultaneous multisource data, multi-incidence angle data, etc., to obtain deformation information along more directions in the study area, so that the true 3D information of the surface can be solved with the mathematical model [4,36,37]. erefore, to obtain accurate 3D surface deformation information, more data must be processed to obtain more deformation information from different aspects, in addition to combining field measurements, retrieving missing measurements by spatial interpolation, etc.…”

Section: Discussionmentioning

confidence: 99%

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Deformation Monitoring in an Alpine Mining Area in the Tianshan Mountains Based on SBAS‐InSAR Technology

Zhou

et al. 2021

Advances in Materials Science and Engineering

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The fragile habitat of alpine mining areas can be greatly affected by surface disturbances caused by mining activities, particularly open-pit mining activities, which greatly affect the periglacial environment. SBAS-InSAR technology enables the processing of SAR images to obtain highly accurate surface deformation information. This paper applied SBAS-InSAR technology to obtain three years of surface subsidence information based on the 89-scene Sentinel-1A SLC products, covering a mining area (tailings and active areas) in the Tianshan Mountains and its surroundings from 25th December 2017 to 2nd January 2021. The data were adopted to analyze the characteristics of deformation in the study region and the mining areas, and the subsidence accumulation was compared with field GNSS observation results to verify its accuracy. The results showed that the study area settled significantly, with a maximum settlement rate of −44.80 mm/a and a maximum uplift rate of 28.04 mm/a. The maximum settlement and accumulation of the whole study area over the three-year period were −129.39 mm and 60.49 mm, respectively. The mining area had a settlement value of over 80 mm over the three years. Significantly, the settlement rates of the tailings and active areas were −35 mm/a and −40 mm/a, respectively. Debris accumulation in the eastern portion of the tailings and active areas near the mountain was serious, with accumulation rates of 25 mm/a and 20 mm/a, respectively, and both had accumulation amounts of around 70 mm. For mine tailing pile areas with river flows, the pile locations and environmental restoration should be appropriately adjusted at a later stage. For gravel pile areas, regular cleaning should be carried out, especially around the mining site and at the tunnel entrances and exits, and long-term deformation monitoring of these areas should be carried out to ensure safe operation of the mining site. The SBAS-InSAR measurements were able to yield deformations with high accuracies over a wide area and cost less human and financial resources than the GNSS measurement method. Furthermore, the measurement results were more macroscopic, with great application value for surface subsidence monitoring in alpine areas.

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Section: Discussionmentioning

confidence: 99%

“…Mining activity can cause surface deformations and negatively impacts the environment [1,2]. If rehabilitation measures are not handled properly, they can lead to serious subsequent disasters such as mine collapse [3], slope instability [4], vegetation death over large areas [2,5], and severe water-soil erosion [3].…”

Section: Introductionmentioning

confidence: 99%

Deformation Monitoring in an Alpine Mining Area in the Tianshan Mountains Based on SBAS‐InSAR Technology

Zhou

et al. 2021

Advances in Materials Science and Engineering

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“…Full-sized 3D models can estimate the deformations of underground openings and explore the mining-induced stress redistribution paths better than 2D analysis models [ 30 , 34 , 35 , 36 , 37 ]. Therefore, to better represent the complicated geometry of the stopes and haulages in the mining pipe at the hard rock mine, a full-sized elastoplastic three-dimensional (3D) model was developed by employing ABAQUS codes [ 38 ].…”

Section: Background and Methodologymentioning

confidence: 99%

Investigation and Stability Assessment of Three Sill Pillar Recovery Schemes in a Hard Rock Mine

Apel

Wang

et al. 2022

Energies

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In Canada, many mines have adopted the sublevel stoping method, such a blasthole stoping (BHS), to extract steeply deposited minerals. Sill pillars are usually kept in place in this mining method to support the weight of the overburden in underground mining. To prolong the mine’s life, sill pillars will be recovered, and sill pillar recovery could cause failures, fatality, and equipment loss in the stopes. In this paper, three sill pillar recovery schemes—SBS, SS1, and SS2—were proposed and conducted to assess the feasibility of recovering two sill pillars in a hard rock mine by developing a full-sized three-dimensional (3D) analysis model employing the finite element method (FEM). The numerical model was calibrated by comparing the model computed ground settlement with the in situ monitored ground settlement data. The rockburst tendency of the stope accesses caused by the sill pillar recovery was assessed by employing the tangential stress (Ts) criterion and burst potential index (BPI) criterion. All three proposed sill pillar recovery schemes were feasible and safe to recover the sill pillars in this hard rock mine, and the scheme SBS was the optimum one among the three schemes.

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“…Back-analysis of the fracturing limits induced by caving at El Teniente mine conducted by Cavieres et al (2003) showed that a total strain criterion of 5e-3 is a good indicator for delineation of the fracture zone limit from numerical modeling results. This criterion has been used extensively and has been validated further through back-analysis of fracture limits at Kiruna (Sainsbury & Stockel 2012), Grace (Sainsbury & Lorig 2005), Century Mines (Sainsbury et al 2016), and Cadia East (Ghazvinian et al 2020a) as well as Andina, Venetia, Lac des Isles, and Pampa Escondida (confidential reports).…”

Section: Fracture Limitmentioning

confidence: 99%

Surface subsidence analysis associated with caving at La Encantada Silver Mine

Garza-Cruz¹,

Ghazvinian²,

Fuenzalida³

et al. 2022

Caving 2022: Fifth International Conference on Block and Sublevel Caving

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This study describes a multi-year effort to calibrate a numerical model to mapped surface subsidence and other damage indicators in a historic silver mine that is now being exploited via caving. In 2017, the subsidence extent along with the general condition and character of the rock mass both underground and in the vicinity of the craters was evaluated during a site visit. Surface cracks were mapped in the vicinity of the existing crater to provide a more accurate representation of the 2017 fracture limit that needed to be captured by the numerical model before any forward prediction was made. A numerical model was developed to back analyse the 2017 conditions following from the historic mining that had taken place, resulting in close agreement with observations made on site. A forward surface subsidence prediction was then obtained based on the target draw schedule to exploit the remaining orebody via caving. In 2020, the actual draw schedule followed until that point was updated in the model to evaluate the validity of the results of the numerical model as well as future predictions. As new extraction points with updated production tonnages were added to the mining plan, the calibrated model was used to provide updated estimates of cave growth, surface subsidence, and building/infrastructure potential damage through the life-of-mine.

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Three-dimensional analysis of complex anisotropic slope instability at MMG’s Century Mine

Cited by 10 publications

References 19 publications

Deformation Monitoring in an Alpine Mining Area in the Tianshan Mountains Based on SBAS‐InSAR Technology

Deformation Monitoring in an Alpine Mining Area in the Tianshan Mountains Based on SBAS‐InSAR Technology

Investigation and Stability Assessment of Three Sill Pillar Recovery Schemes in a Hard Rock Mine

Surface subsidence analysis associated with caving at La Encantada Silver Mine

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