Determination of Critical Deformation and Destruction Parameters of the Zhelezny Open Pit Rock Mass (JSC Kovdorsky GOK) Based on IBIS FM Ground Radar Data

2019 ◽  
pp. 387-393
Author(s):  
Ivan Rozanov ◽  
Aleksander Zavialov
Keyword(s):  
Rock Mass ◽  
Radar Data ◽  
Open Pit ◽  
Critical Deformation

scholarly journals Determination of the Ultimate Underground Mining Depth considering the Effect of Granular Rock and the Range of Surface Caving

2021 ◽  
Vol 2021 ◽  
pp. 1-16
Author(s):  
Rongxing He ◽  
Jing Zhang ◽  
Yang Liu ◽  
Delin Song ◽  
Fengyu Ren
Keyword(s):  
Numerical Simulation ◽  
Rock Mass ◽  
Mechanical Model ◽  
Surface Deformation ◽  
Underground Mining ◽  
Mining Area ◽  
Open Pit ◽  
Open Pit Mining ◽  
Mining Depth

Continuous mining of metal deposits leads the overlying strata to move, deform, and collapse, which is particularly obvious when open-pit mining and underground mining are adjacent. Once the mining depth of the adjacent open-pit lags severely behind the underground, the ultimate underground mining depth needs to be studied before the surface deformation extends to the open-pit mining area. The numerical simulation and the mechanical model are applied to research the ultimate underground mining depth of the southeast mining area in the Gongchangling Iron mine. In the numerical simulation, the effect of granular rock is considered and the granular rock in the collapse pit is simplified as the degraded rock mass. The ultimate underground mining depth can be obtained by the values of the indicators of surface movement and deformation. In the mechanical model, the modified mechanical model for the progressive hanging wall caving is established based on Hoke’s conclusion, which considers the lateral pressure of the granular rock. Using the limiting equilibrium analysis, the relationship of the ultimate underground mining depth and the range of surface caving can be derived. The results show that the ultimate underground mining depth obtained by the numerical simulation is greater than the theoretical calculation of the modified mechanical model. The reason for this difference may be related to the assumption of the granular rock in the numerical simulation, which increases the resistance of granular rock to the deformation of rock mass. Therefore, the ultimate underground mining depth obtained by the theoretical calculation is suggested. Meanwhile, the surface displacement monitoring is implemented to verify the reasonability of the ultimate underground mining depth. Monitoring results show that the indicators of surface deformation are below the critical value of dangerous movement when the underground is mined to the ultimate mining depth. The practice proves that the determination of the ultimate underground mining depth in this work can ensure the safety of the open-pit and underground synergetic mining.

scholarly journals Planetary fracturing and lineaments revealed in the Kovdor magnetite–apatite ore deposit by open pit mining

2020 ◽  
pp. 30-34
Author(s):  
I. B. Agarkov ◽  
◽  
I. M. Ignatenko ◽  
V. A. Dunaev ◽  
I. S. Kryuchkov ◽  
...  
Keyword(s):  
Rock Mass ◽  
Hard Rock ◽  
Laser Scanner ◽  
Open Pit ◽  
Open Pit Mining ◽  
Mining Operations ◽  
Structural Mapping ◽  
Remote Assessment ◽  
Tectonic Origin

The analysis of the studies into fracturing of Zhelezny pitwall rock mass over the period from 1989 to 2019 proves that planetary fracturing is represented by faults, carbonatite dykes and single fractures oriented in the same direction as the prevailing regional lineaments on the Kola Peninsula. Planetary fracturing is assumed as a system of regular-oriented fractures. The planetary fracturing also includes lineaments of tectonic origin. The scientists think the faults registered in the pitwall rock mass and codirectional with the lineaments will accompany mining operations down to the full depth of the pit, up to the full extraction of magnetite–apatite ore reserves. While preparing this article, the authors have collected, generalized and analyzed the data of geological and structural mapping implemented by VIOGEM’s experts over the period from 1989 to 2019. VIOGEM’s procedure of geological and structural mapping ensures continuous documentation of extensional tectonics at high referencing accuracy (to 50 cm), as well as determination of inaccessible azimuths and angles of fractures by remote assessment of their orientations in pit walls using a laser scanner and photographic techniques to study the structure of hard rock mass and the behavior of permanent benches.

scholarly journals Determination of the earth's surface deformations in the "Kiyzassky" open pit according to Sentinel-1 Data

2020 ◽  
Vol 223 ◽  
pp. 03010
Author(s):  
Leonid Mikov ◽  
Semion Popov
Keyword(s):  
Land Surface ◽  
Surface Displacement ◽  
Vertical Displacement ◽  
Radar Data ◽  
Open Pit ◽  
The Earth ◽  
Small Baseline Subset ◽  
Satellite Radar ◽  
Small Baseline

The paper deals with the issues of assessment of the condition and changes in the land surface on the territory of the Kiizassky open pit (Kemerovo region) because of the landslide that occurred in June 2019. The application of the multi-pass series of Sentinel-1 satellite radar data using the Small Baseline Subset (SBaS) method to determine the Earth surface displacement dynamics using constructed vertical displacement maps is demonstrated..

scholarly journals DEVELOPMENT OF DESIGN METHODS FOR DRILLING AND BLASTING OPERATIONS IN OPEN MINE WORKINGS USING GGIS MICROMINE

2019 ◽  
Vol 1 (1) ◽  
pp. 249-258
Author(s):  
Andrei Basargin ◽  
Valery Salnikov ◽  
Viktor Pisarev
Keyword(s):  
Rock Mass ◽  
High Intensity ◽  
Open Pit ◽  
Design Decisions ◽  
Well Placement ◽  
Open Pit Mines ◽  
Condi Tions ◽  
Additional Costs ◽  
Mine Workings

One of the effective ways of collecting information about the properties of the exploding ar-ray is the use of information obtained in the process of drilling wells. This approach is attractive be-cause it does not violate the existing technology of conducting work in a quarry and does not re-quire additional costs for conducting geological studies related to the determination of the physical and strength characteristics of the component rocks of the block. GGIS Micromine will allow automating the design of drilling and blasting operations while ensuring the well placement, taking into account geometry of the block, properties of rocks, and ra-tional distribution of well charges for the most effective crushing of the rock mass. Under the condi-tions of high intensity mining at the open pit mines of the Micromine GGIS, the design decisions are quick and multifaceted when performing drilling and blasting operations.

scholarly journals Digitalization in Open-Pit Mining: A New Approach in Monitoring and Control of Rock Fragmentation

2021 ◽  
Vol 11 (22) ◽  
pp. 10848
Author(s):  
Natalia Koteleva ◽  
Sergei Khokhlov ◽  
Ilia Frenkel
Keyword(s):  
Rock Mass ◽  
Digital Technologies ◽  
Open Pit ◽  
Open Pit Mining ◽  
Monitoring And Control ◽  
New Approach ◽  
And Control ◽  
The Relationship ◽  
Operational Component

Mining enterprises are widely introducing digital technologies and automation is one of such tools. Granularity monitoring, namely, the size determination of rock mass pieces is a common operational component of the processes that extract minerals by open-pit mining. The article proposes an approach that, in addition to the lump size distribution, makes it possible to estimate the lump form distribution as well. To investigate the effectiveness of monitoring the form of blasted rock mass lumps, the authors conducted experiments in four stages related to the rock condition. They include geological occurrence, explosive crushing, trommelling, and mill crushing. The relationship between these stages is presented and the change in the lumps fragment form is traced. The present article proposes an informational and analytical model of the processes at mining enterprises, extracting minerals by open-pit mining, as well as an algorithm for determining the lumps form and obtaining their distribution in the rock mass.

scholarly journals Hydrofracturing in Situ Stress Measurements in Itabirite Brazilian Ferriferous Quadrilater, and their Limitations

2021 ◽  
Author(s):  
Henrique de Andrade Penido ◽  
Rodrigo Peluci de Figueiredo ◽  
André Pacheco de Assis ◽  
Vidal Félix Navarro Torres ◽  
Juan Manuel Girao Sotomayor ◽  
...  
Keyword(s):  
Rock Mass ◽  
In Situ Stress ◽  
Open Pit ◽  
Stress Tests ◽  
K Index ◽  
Fracture Tests ◽  
The Stability ◽  
In Situ Stress Measurements

Abstract This article presents a first attempt to carry out measurements (magnitudes and orientations) of the in situ stress in itabirite rocks in the region of the Brazilian Ferriferous Quadrilater obtained by hydraulic fracture tests at a depth of 399 m. Previous studies available in this rock mass consider estimated values of k index (Sh / Sv), and it is not a practice adopted to carry out in situ stress tests in this region and rockmass to support geotechnical analysis. The area of study is located at a depth of 500 m in a pit; therefore, the determination of the in situ stress distribution is very important to assess the stability of the mining open pit. The activities, from the planning to the execution of the tests, and the results are presented. The rock mass under study shows the presence of different geological structures, such as banding and foliation, which resulted in difficulties with performing the tests, and only 12.5% of the tests were successful. The results contribute to understanding the strains and stresses induced by mining activities in slopes in the Brazilian Ferriferous Quadrilater and their impacts on surrounding structures. For a better determination of the regional in situ stresses in the rock mass of the Brazilian Ferriferous Quadrilater, it is recommended to perform hydraulic tests on pre-existing fractures.

scholarly journals Determination of bench, dump and road sliding wedge technological parameters

2021 ◽  
Vol 6 (1) ◽  
pp. 31-41
Author(s):  
I. K. Chunuev ◽  
Yu. M. Levkin ◽  
Zh. Bolotbekov
Keyword(s):  
Rock Mass ◽  
Slope Stability ◽  
Open Pit ◽  
Open Pit Mining ◽  
Dump Truck ◽  
Transport Equipment ◽  
Mining Operations ◽  
Stability Calculation ◽  
Mine Surveying

Mine surveying in mining operations is of particular importance, since all technological processes of the full life cycle of a mining enterprise and, ultimately, its competitiveness depend on the surveying quality, efficiency and reliability. Organizations independently determine the structure of mine surveying services, taking into account the methods applied and the scale of mining. To ensure safe open-pit mining of minerals, it is necessary to permanently assess and monitor the pit bench and wall rock mass condition. Misjudgement of rock physical and mechanical properties, non-observance of the minerals mining and transportation process cycle, changes in climatic conditions and other problems lead to loss of stability of rocks in all parts of an open pit, including in the areas of ore production and mining and transport equipment operation. The existing practice shows that the effectiveness of an open pit wall and bench stability calculation can be achieved using a technique that should take into account the slope deformation and failure mechanism, as well as the nature of the stress-strain state of the open pit rock mass. The studies presented in the paper are based on comparative analysis of the sliding wedge parameters for benches, dumps and roads at open pits using analytical and graphical software packages, and taking into account the static load produced by dump trucks. The study findings allow to establish that: determination of the bench slope stability and the sliding wedge width, performed by the analytical method, gives higher accuracy results than those obtained by the graphical method; the bench slope stability and the sliding wedge width depend not only on the rock physical and mechanical condition, but also on the bench height, the dump truck (plus its freight load) weight per 1 linear meter of the placement area, the distance from the slope edge and other factors; the rock mass is stable and not subject to landslide phenomena for as long as the sum of the holding forces is greater than or equal to the sum of the shearing forces; when using large-sized transport equipment of nonstandard weight in open-pit mining, it is necessary to calculate the safe width of the sliding wedges, taking into account the loads on them (per 1 linear meter), the values of which can be 1.5–2.0 times higher than those calculated for the circular-cylindrical sliding surface.

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