scholarly journals Analysis of physical properties of granular materials on their numerical models (2D case)

2021 ◽  
Vol 315 ◽  
pp. 01018
Author(s):  
Sergey Markov ◽  
Maxim Tyulenev ◽  
Stefan Vöth ◽  
Vasiliy Klintsov
Keyword(s):  
Monte Carlo ◽  
Specific Surface ◽  
Granular Materials ◽  
Numerical Models ◽  
Physical Characteristics ◽  
Open Pit ◽  
Open Pit Mining ◽  
Rock Fragments ◽  
Bulk Medium ◽  
Packing Method

The paper describes a method for determining the density and specific surface of the package of rock particles represented by discs with the size corresponding to the size of the rock fragments of real dump massifs (2D case). The packing method of the particles corresponds to the schemes of dumping used in open-pit mining - areal and peripheral ones. The influence of boundaries, in which the dump is located, on the physical characteristics of this massif - density and porosity - is revealed. It was revealed that the way of formation of the bulk of particles affects its density, especially at the boundaries of the massif. The massif of particles formed in accordance with the area technology of dumping has a denser composition and is less affected by the effect of its boundaries than the massif formed in accordance with the peripheral technology of dumping. The applied method of determining the physical characteristics of the bulk medium differs from the statistical methods (e.g., Monte Carlo) and is well-proven for static media, such as dumps and filtering massifs in open-pit mining.

scholarly journals ANALISIS PROBABILITAS KESTABILAN LERENG TAMBANG TIMAH PRIMER BLOK PEMALI, BANGKA, INDONESIA

2020 ◽  
Vol 1 (1) ◽  
pp. 463-474
Author(s):  
Teguh Nurhidayat ◽  
Edo Syawaludin ◽  
Muchtar Arifin ◽  
Iwan Oktariansyah
Keyword(s):  
Monte Carlo ◽  
Slope Stability ◽  
Cross Section ◽  
Slope Angle ◽  
Shear Angle ◽  
Open Pit ◽  
Open Pit Mining ◽  
Unit Weight ◽  
Strength Parameters ◽  
Laboratory Test Results

ABSTRAK Studi geoteknik sangat penting pada tambang terbuka untuk menentukan geometri lereng dan kestabilan lereng tambang. Kestabilan lereng pada tambang terbuka sangat mempengaruhi kelangsungan produksi dan keselamatan pekerja pada tambang tersebut. Pada kasus tambang timah primer, material pembentuk lereng yang terdiri dari batuan induk berupa granit dan tanah dekomposisi dari granit. Hal ini dapat memberikan masalah dalam penentuan parameter kekuatan material dan analisis yang digunakan. Karena  parameter kekuatan yang berasal dari dekomposisi granit mempunyai variabilitas yang tinggi. Metode deterministik tidak cukup untuk memodelkan kestabilan lereng pada tambang timah primer. Sehingga dilakukan perpaduan antara penggunaan metode deterministik dan probabilistik dalam proses analisis kestabilan lereng. Pemboran geoteknik dilakukan dengan cara full coring. Parameter sifat fisik dan mekanik material lereng didapat dari hasil pengujian laboratorium. Nilai internal shear angle, unit weight dan cohesion diproses dengan simulasi Monte Carlo sebagai model variabel acak. Simulasi Monte Carlo melakukan evaluasi secara simultan dari kestabilan lereng. Simulasi juga dilakukan dengan variasi sudut lereng keseluruhan dan proses pengeringan air tanah. Hasil simulasi memperlihatkan lereng pada penampang 1 dengan sudut lereng keseluruhan sebesar 25o (pada keadaan dinamik, SF= 1.216, PF= 8.1%, RI= 1.419)  dengan proses pengeringan air tanah, penampang 2 pada sudut lereng keseluruhan 35 o(pada keadaan dinamik, SF= 1.44 , PF= 0% , RI= 3.535)  dan Penampang 3 pada sudut lereng keseluruhan 15o (pada keadaan dinamik, SF= 1.469 ,PF= 13.7%, RI= 1.079).   Kata kunci: kestabilan lereng, probabilitas, timah primer  ABSTRACT Geotechnical studies are very important in open pit mining to determine the slope geometry and stability of the mine slope. Slope stability at an open pit greatly influences the continuity of production and the safety of workers at the mine. In the case of primary tin mining, slope-forming material consisting of host rock in the form of granite and soil decomposition of granite. It can give problems in determining the strength parameters and the modeling used. Because the strength parameters derived from granite decomposition have high variability. The deterministic method is not enough to model slope stability in primary tin mines. So it is a combination of the use of deterministic and probabilistic methods in the process of modeling the slope stability. Geotechnical drilling is done by full coring. The parameters of physical and mechanical properties of slope material are obtained from laboratory test results. Internal shear angle, unit weight and cohesion values are processed by Monte Carlo simulation as a random variable model. Monte Carlo simulations carry out simultaneous evaluations of slope stability. Simulations are also carried out with overall slope angle variation and groundwater dewatering. Simulation results show that the slope at cross-section 1 at overall slope angle(OSA) 25o (under dynamic condition, SF = 1,216, PF = 8.1%, RI = 1,419) with groundwater dewatering process, cross-section 2 at with 35o(OSA) (SF = 1.44, PF = 0%, RI = 3,535) and Section 3 at 15o (SF = 1,469, PF = 13.7%, RI = 1,079). Key word: slope stability, probability, primary tin 

Reliability-based performance analysis of mining drilling operations through Markov chain Monte Carlo and mean reverting process simulations

SIMULATION ◽  
2020 ◽  
Vol 96 (7) ◽  
pp. 593-604 ◽  
Author(s):  
Omer Faruk Ugurlu ◽  
Mustafa Kumral
Keyword(s):  
Monte Carlo ◽  
Markov Chain ◽  
Markov Chain Monte Carlo ◽  
Production Scheduling ◽  
Commodity Prices ◽  
Mining Operation ◽  
Open Pit ◽  
Open Pit Mining ◽  
Mining Operations ◽  
Rotary Drilling

In recent years, commodity prices have swiftly decreased, narrowing the profit margin for many mining operations and forcing them to find effective cost management strategies to respond to low prices. Given that equipment is one of the most significant assets of a mining company, efficient equipment utilization has strong potential to reduce costs. This paper focuses on the relationship between the number of available drilling machines based on reliability analysis and the number of holes to be created on a bench of an open pit mining operation. Since equipment availability is random in nature, a range of holes to be drilled corresponding to a specified probability level was determined. To assess the performance of the proposed approach, a case study was carried out using two stochastic modeling techniques. Evolutions of reliabilities of 10 rotary drilling machines over a specific time were simulated by Markov chain Monte Carlo and mean reverting processes, using historical data. Multiple simulations were then used for risk quantification. Results show that the proposed approach can be used as a tool to assist production scheduling and assess the associated risk.

Coal mining-disturbed land reclamation laws

2020 ◽  
pp. 15-26
Author(s):  
T. V. Galanina ◽  
M. I. Baumgarten ◽  
T. G. Koroleva
Keyword(s):  
Large Scale ◽  
Land Reclamation ◽  
Mining Industry ◽  
Development Program ◽  
Soil Disturbance ◽  
Open Pit ◽  
Open Pit Mining ◽  
Disturbed Land ◽  
Critical Problems ◽  
Production Output

Large-scale mining disturbs wide areas of land. The development program for the mining industry, with an expected considerable increase in production output, aggravates the problem with even vaster territories exposed to the adverse anthropogenic impact. Recovery of mining-induced ecosystems in the mineral-extracting regions becomes the top priority objective. There are many restoration mechanisms, and they should be used in integration and be highly technologically intensive as the environmental impact is many-sided. This involves pollution of water, generation of much waste and soil disturbance which is the most typical of open pit mining. Scale disturbance of land, withdrawal of farming land, land pollution and littering are critical problems to the solved in the first place. One of the way outs is highquality reclamation. This article reviews the effective rules and regulations on reclamation. The mechanism is proposed for the legal control of disturbed land reclamation on a regional and federal level. Highly technologically intensive recovery of mining-induced landscape will be backed up by the natural environment restoration strategy proposed in the Disturbed Land Reclamation Concept.

Current state and perspectives in automation of the open pit mining operations

2019 ◽  
Vol 8 (30) ◽  
pp. 115-123
Author(s):  
A.A. Sobolev ◽  
◽  
G.V. Sekisov ◽  
A.Yu. Cheban ◽  
N.M. Litvinova ◽  
...  
Keyword(s):  
Open Pit ◽  
Open Pit Mining ◽  
Mining Operations ◽  
Current State

Bulldozer-based technology for open pit mining of limestone-dolomite deposits

2020 ◽  
Vol 3 ◽  
pp. 16-29
Author(s):  
K.R. Argimbaev ◽  
◽  
D.N. Ligotsky ◽  
E.V. Loginov ◽  
◽  
...  
Keyword(s):  
Open Pit ◽  
Open Pit Mining

Probabilistic multiscale modeling of fracture in heterogeneous materials and structures

2020 ◽  
Vol 86 (7) ◽  
pp. 45-54
Author(s):  
A. M. Lepikhin ◽  
N. A. Makhutov ◽  
Yu. I. Shokin
Keyword(s):  
Monte Carlo ◽  
Monte Carlo Method ◽  
Fracture Mechanics ◽  
Multiscale Modeling ◽  
Virtual Work ◽  
Numerical Models ◽  
Heterogeneous Materials ◽  
Heterogeneous Structure ◽  
Generalized Coordinates ◽  
Heterogeneous Structures

The probabilistic aspects of multiscale modeling of the fracture of heterogeneous structures are considered. An approach combining homogenization methods with phenomenological and numerical models of fracture mechanics is proposed to solve the problems of assessing the probabilities of destruction of structurally heterogeneous materials. A model of a generalized heterogeneous structure consisting of heterogeneous materials and regions of different scales containing cracks and crack-like defects is formulated. Linking of scales is carried out using kinematic conditions and multiscale principle of virtual forces. The probability of destruction is formulated as the conditional probability of successive nested fracture events of different scales. Cracks and crack-like defects are considered the main sources of fracture. The distribution of defects is represented in the form of Poisson ensembles. Critical stresses at the tops of cracks are described by the Weibull model. Analytical expressions for the fracture probabilities of multiscale heterogeneous structures with multilevel limit states are obtained. An approach based on a modified Monte Carlo method of statistical modeling is proposed to assess the fracture probabilities taking into account the real morphology of heterogeneous structures. A feature of the proposed method is the use of a three-level fracture scheme with numerical solution of the problems at the micro, meso and macro scales. The main variables are generalized forces of the crack propagation and crack growth resistance. Crack sizes are considered generalized coordinates. To reduce the dimensionality, the problem of fracture mechanics is reformulated into the problem of stability of a heterogeneous structure under load with variations of generalized coordinates and analysis of the virtual work of generalized forces. Expressions for estimating the fracture probabilities using a modified Monte Carlo method for multiscale heterogeneous structures are obtained. The prospects of using the developed approaches to assess the fracture probabilities and address the problems of risk analysis of heterogeneous structures are shown.

scholarly journals On the Measures to Solve Environmental Problems of the Territory with Intensive Open Pit Coal Mining

2019 ◽  
Vol 105 ◽  
pp. 02006
Author(s):  
Tatiana Gvozdkova ◽  
Pawel Stefanek ◽  
Michaela Koščová
Keyword(s):  
Soil Cover ◽  
Mineral Resources ◽  
Radioactive Isotopes ◽  
Open Pit ◽  
Open Pit Mining ◽  
Mining Operations ◽  
Coal Deposits ◽  
Disturbed Land ◽  
Ecological Problems ◽  
Suitable Form

Ecological problems in the open pit mining of coal deposits are extremely hard, since mining operations are accompanied by disturbed land to a large depth with significant changes in the landscape, hydrometeorological conditions, mixing of rocks and removal of infertile or even harmful rocks with radioactive isotopes to the surface. Disturbed lands are unusable if they are not repaired. All man-made disturbances of the environment caused by open pit mining are divided into landscape (changes in terrain, vegetation and soil cover) and environmental (violation of living conditions within the allotment and adjacent lands: changes in water regime, pollution of the soil, air and water basins) onesOne of the most important areas in the field of environmental protection is the reclamation (restoration) of the earth’s surface. In accordance with the requirements of the protection of the subsoil, enterprises engaged in the development of mineral deposits are obliged at their own expense to bring disturbed lands into a state suitable form for their further use. Reclamation of ought to be carried out during open pit mining operations and must be completed after mining of mineral resources in the terms established by the authorities that provide land for use.

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