scholarly journals Modelisation of fractured rock mass for open pit mining in Vietnam

2020 ◽  
Vol 61 (5) ◽  
pp. 80-96
Author(s):  
Tuan Anh Nguyen ◽  
Viet Van Pham ◽  
Nam Xuan Bui ◽  
Hoa Thu Thi Le ◽  
Hai Thi Le ◽  
...  
Keyword(s):  
Rock Mass ◽  
Fractured Rock ◽  
Construction Materials ◽  
Mining Operation ◽  
Open Pit ◽  
Open Pit Mining ◽  
Design Parameters ◽  
Geometrical Parameters ◽  
Fractured Rock Mass ◽  
Mass Data

In open pit mining, besides the value of the minerals obtained, the cost of waste rock removal determines the efficiency of the mining operation. The paper introduces the rock mass data processing method and modelisation of fractured rock mass to serve the optimal calculation of technological stages in mining. This code is a discrete fracture network (DFN) code that couple geometrical block system construction based on modelisation stochastic with RESOBLOK simulations. The method of three-dimensional modeling (3D) of the fractured rock mass in the quarry is based on the rock mass data, the geometrical parameters of the open pit mine. From there, the rock mass simulation models were used in the analysis of the stability analysis of open pit benches, the optimization of the blast design parameters at overburden benches, project construction materials, and technology projects for block stone extraction. An application in some open pit mines such as quarries of Vietnam is presented.

scholarly journals Granulometric composition predicting models after explosion in open-pit mining

2020 ◽  
pp. 14-24
Author(s):  
Sergei Vokhmin ◽  
Keyword(s):  
Rock Mass ◽  
Granulometric Composition ◽  
Construction Materials ◽  
Production Costs ◽  
Open Pit ◽  
Open Pit Mining ◽  
Technological Problem ◽  
Total Production ◽  
Ferrous Metals ◽  
Fraction Yield

Introduction. Drilling and blasting operations are first in the workflow and significantly determine the economic efficiency of the entire mining and primary processing workflow in the enterprise. The cost of drilling and blasting operations is a significant part of total production costs of large mining companies. In this context, mining engineers today are facing a crucial technological problem, i.e. the reduction of the off-gauge fraction yield after the explosion. Research aims to develop the models which forecast the granulometric composition of the rock mass taken down as the original factor in reducing the economic waste of the entire workflow. Methodology. The parameters which influence the results of rock mass fragmentation and the techniques of rock mass granulometric composition forecasting in the course of drilling and blasting were analyzed. Results. The present paper gives a brief overview of the global mineral output; provides information on the extraction of key types of minerals (mineral fuel, ferrous metals, non-ferrous metals, precious metals, and construction materials), as well as revenues derived from their sale. On the example of domestic companies, approaches to the issue of forecasting the off-gauge fraction yield after the explosion. Summary. Direction for future actions in creating the model forecasting rock mass yield of a certain fraction after the explosion.

Estimation of open-pit / underground mining cross-effect in complicated geomechanical conditions

2021 ◽  
pp. 58-63
Author(s):  
I. E. Semenova ◽  
◽  
I. M. Avetisyan ◽  
Keyword(s):  
Rock Mass ◽  
Underground Mining ◽  
Ground Surface ◽  
Mining Operation ◽  
Open Pit ◽  
Design Parameters ◽  
Cross Effect ◽  
Stress Strain ◽  
Tectonic Stresses ◽  
Crown Pillar

The paper presents the results of prediction model studies of the stress–strain behavior in Gakman field of Yukspor deposit during hybrid open pit/underground mining under conditions of high tectonic stresses. The mountainous relief, rock mass faulting with a series of weak structures, geometry of the ore body, the actual and design parameters of stopes, and mining operation under the uncaved overlying stratum with three-sided support are taken into account. Based on the multivariate threedimensional stress–strain modeling using the finite element method, geomechanical substantiation of simultaneous open-pit and underground mining was carried out. It has been established that the geomechanical determinants in Gakman field are: – gravitational and tectonic stresses with a significant excess of the tectonic component over the gravitational component; – mountainous relief of ground surface with a significant elevation difference in the study area; – location of underground mining under the uncaved overlying stratum with three-sided support; – faulting of rock mass with a series of weak structures (Gakman fault); – formation of the open pit and crown pillar above underground mine; – significant lag of the mining front on the underlying levels of level + 320 m. The dimensions of the cross-effect zone and crown pillar when the underground operations approach the open pit mine are determined.

Slope stability investigation at Gaspé copper mines

1977 ◽  
Vol 14 (4) ◽  
pp. 477-486
Author(s):  
V. J. Hucka ◽  
J. G. Levaque ◽  
M. Allard
Keyword(s):  
Mechanical Properties ◽  
Rock Mass ◽  
Slope Stability ◽  
Mining Operation ◽  
Geological Mapping ◽  
Open Pit ◽  
Open Pit Mining ◽  
Ore Body ◽  
Copper Mines ◽  
Slope Design

In view of the extensive open pit mining operation at Gaspé Copper Mines Limited, Murdochville, Quebec, a study of an optimum slope design was felt necessary. This paper describes the different steps of the slope stability project: origin and organization to achieve an optimum design. The various phases of the project were: survey of the ore body and topography, investigation of physico-mechanical properties of rocks, structural geological mapping, groundwater study, and detailed study of structural weaknesses. The results were subsequently used to analyse different modes of possible failure of rock mass. The information obtained is being used in redesigning the Copper Mountain pit.

Mobile Safety Screen for Secondary Breaking

2021 ◽  
pp. 105-109
Author(s):  
S.P. Tarasov ◽  
P.I. Tarasov ◽  
M.L. Khazin
Keyword(s):  
Rock Mass ◽  
Shock Waves ◽  
Road Construction ◽  
Mining Operation ◽  
Open Pit ◽  
Open Pit Mining ◽  
Long Distance ◽  
Long Distance Transport ◽  
Hazardous Area ◽  
Distance Transport

Research objective: Development and implementation of a mobile safety screen for secondary breaking. Research methodology: Analysis of secondary breaking of oversize boulders. Research results: blasting creates oversize chunks of rock (boulders) in the pit walls and floor, which affects the productivity of the pit and the mining operation as a whole. Open pit mines with large volumes of rock formations have to handle hundreds of cubic metres of boulders every day bearing significant labour and material costs of these activities. Various methods of boulder breaking are used in open pit mining, including electrical treatment, mechanical impact, blasting, etc. A common disadvantage of these techniques is their relatively low capacity. Out of all the applied methods, drilling and blasting of boulders is the most effective, but the use of this method is limited due to the use of various equipment, increased hazards and the presence of certain other disadvantages. The autonomous mobile safety screen has been developed to solve this bottleneck. The use of this safety screen enables breaking boulders using blasting techniques, reduces the size of the hazardous area, increases the efficiency of the air shock waves, prepares safety trenches in open pits and for road construction, prepares the rock mass for long-distance transport by road or railways. Conclusions: The use of this safety screen enables breaking boulders using blasting techniques, reduces the size of the hazardous area, increases the efficiency of the air shock waves, prepares safety trenches in open pits and, during road construction, prepares the rock mass for long-distance transport by motor and railroads.

Study of the geometrical size effect of a fractured rock mass based on the modified blockiness evaluation method

2018 ◽  
Vol 11 (11) ◽  
Author(s):  
Qingfa Chen ◽  
Tingchang Yin ◽  
Wenjing Niu ◽  
Wenshi Zheng ◽  
Junguang Liu
Keyword(s):  
Rock Mass ◽  
Size Effect ◽  
Evaluation Method ◽  
Fractured Rock ◽  
Fractured Rock Mass ◽  
Geometrical Size

General concept of determining the parameters of non-mining walls of ultra-deep diamond deposits development open pits

2021 ◽  
pp. 48-53
Author(s):  
I. V. Zyryanov ◽  
A. N. Akishev ◽  
I. B. Bokiy ◽  
N. M. Sherstyuk
Keyword(s):  
Rock Mass ◽  
Structural Relaxation ◽  
Slope Angle ◽  
Field Tests ◽  
Friction Angle ◽  
Strength Properties ◽  
Strength Characteristics ◽  
Open Pit ◽  
Open Pit Mining ◽  
Relaxation Coefficient

A specific feature of open pit mining of diamond deposits in Western Yakutia is the construction of the open pits in the zone of negative ambient temperatures, which includes thick permafrost rock mass, and which is at the same time complicated by the influence of cryogenic processes on deformation of pit wall benches. The paper presents the comparative analysis of strength characteristics in frozen and thawed rocks, stability of benches during mining, the general geomechanical approach to the determination of parameters of non-mining walls of the ultra-deep open pit diamond mines, and the parameters of nonmining walls and benches. Optimization of open pit wall configuration should primarily be based on the maximum utilization of the strength properties of frozen rocks in combination with the development of new approaches, calculation schemes and methods for assessing stability of open pit walls and benches of unconventional design, including the non-mining vertical benches. The main design characteristic that determines the parameters of open pit walls is the structural tectonic relaxation coefficient, which specifies the calculated value of cohesion in rock mass. For the diamond deposits, the values of the structural relaxation coefficient were obtained in a series of field tests and back calculations. Full-scale tests were carried out both during exploration operations in underground mines and in open pits. The accuracy of determining the values of the structural relaxation coefficient in the range of 0.085–0.11 is confirmed by the parameters of non-mining walls in an open pit mine 385–640 m deep, with overall slope angles of 38–55° and a steeper H 0.35–0.5 lower part having the slope angle of up to 70° with average strength characteristics of 7.85–11.84 MPa and the internal friction angle of 28.1–37.4°. Using the natural load-bearing capacity of rock mass to the full advantage, which the values of the structural relaxation coefficient of deposits show, allows optimization of open pit wall slope design and minimization of stripping operations.

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