scholarly journals Evaluation of the possibility of manifestation of deformations from the position of disturbance of the massif (using the Kamagan field as an example)

2020 ◽  
pp. 173-182
Author(s):  
Oksana Sergeevna KOLESATOVA ◽  
◽  
Elena Aleksandrovna GORBATOVA ◽  
◽  
Keyword(s):  
Structural Features ◽  
Open Pit ◽  
Main Task ◽  
Mining Operations ◽  
Edge Zone ◽  
Stability Of Slopes ◽  
Fracture Systems ◽  
Prediction And Prevention ◽  
Long Time ◽  
The Stability

Introduction. The main task in the development of mineral deposits by open and underground methods is to ensure the safety of mining operations. As a result of long-time standing of the pit walls in the near edge zone massif, changes in natural stresses can occur, which lead to deformations. Prediction and prevention of deformation processes of the near-rock massif largely depend on reliable information about its structural features, including the structure of the massif and the degree of its disturbance. Purpose of research is to assess the possibility of manifestation of deformations from the position of disturbance of the massif. Methods of research. When assessing the possibility of deformation manifestation, a set of methods was used, including: full-scale measurements of fracturing; methods of mathematical statistics using the Stereonet program for processing measurement results; analysis of the spatial position of cracks relative to the direction of strike of the slopes and sides of the open pit with the identification of the most dangerous ones; kinematic analysis, allowing to determine potential types of loss of stability from the position of disturbance of the massif. Result of research. In the southeastern, northern and western sides of the Kamagan open pit, 41 fracture systems have been identified; the prevailing systems are northwestern dip systems at angles of 50 ° –85 °; south-east - at an angle of 50 ° and south-west - at an angle of 50 °. For example, for the northern side (Ap = 90 °; n = 60 °), it was found that potential types of destabilization are: wedge formed by systems of cracks with spatial characteristics Ap = 65 °; n = 45 ° and Apr = 150 °; n = 90 °, and planar sliding formed by systems of cracks with the parameters Ap = 90 °; n = 55 ° and Apr = 100 °; n = 42 °. Conclusions. Studies have proven the need to study and identify weakening surfaces in the process of mining and determine the parameters of their occurrence in order to assess the possibility of deformations and further assess the stability of slopes.

scholarly journals Study on the influence of the deformation zones of the quarry sides on the rock mass movement

2021 ◽  
Vol 304 ◽  
pp. 02002
Author(s):  
Vokhid Kadirov ◽  
Sherzod Karimov ◽  
Uchqun Qushshayev ◽  
Durdona Sharapova
Keyword(s):  
Rock Mass ◽  
Mass Movement ◽  
Physical And Mechanical Properties ◽  
Structural Features ◽  
Open Pit ◽  
Open Pit Mining ◽  
Rock Masses ◽  
Mining Operations ◽  
Dump Trucks ◽  
The Stability

The article presents a study and analysis of the causes of deformation of the slopes and sides of the quarry indicates that the magnitude and nature of the deformation processes depend on the height of the ledge, the angle of slope of the slopes, the physical and mechanical properties, the lithological and structural features of the instrument array and the geodynamic activity of the fault zones. The influence of the deformation zones of the sides of the quarry on the transport of rock masses is justified. The zone of deformed masses of the ore deposit, which affect the movement of the rock mass, is studied. Each process performed in open pit mining is linked to another workflow. Without ensuring the safety of mining operations and performing the tasks set is impossible. Transportation of rock masses in the lower horizons of a deep quarry is one of the main tasks of the industry. At the same time, the removal of deformation and landslides in the area where the transport berm is being constructed for draining and continuous transportation is the main goal of the quarry. The stability of the transport berm depends directly on the stability of the side of the quarry. It is determined that the choice of a single-lane or twolane transport berm constructed for heavy-duty quarry dump trucks depends on the condition of the side of the quarry.

scholarly journals Calibration of a Three-dimensional slope stability evaluation in Brazilian iron open pit mine

2021 ◽  
Author(s):  
Vidal Félix Navarro Torres ◽  
Rodrigo Dockendorff ◽  
Juan Manuel Girao Sotomayor ◽  
Cristian Castro ◽  
Aristotelina Ferreira da Silva
Keyword(s):  
Three Dimensional ◽  
Structural Features ◽  
Open Pit ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Strength Parameters ◽  
Dimensional Section ◽  
The Stability ◽  
Evaluation Techniques

Abstract It has historically been frequent among geotechnical practitioners, that the stability analysis of the slopes of an open pit is performed using a two dimensional section representing the highest and steepest walls within a certain geological setting. However, the literature shows that to predict rupture events in an open pit, a three-dimensional analysis would better represent the actual conditions, as the spatial distribution of the lithology and the structural features play an important role when defining the stability of the slopes. This paper presents the case study of an open it located in Brazil, which experienced instabilities between the years 2001-2019. An evaluation of the behavior of the open pit was performed by calibrating the strength parameters to represent the best documented rupture events. The three-dimensional model was made using the FLAC3D software. The results show that there is a good correlation between the results of the model and the reports of past instabilities. Finally, recommendations are presented for the inter-ramp angles for each lithology based on the calibrated stability analyzes performed. This work seeks to contribute to the knowledge in evaluation techniques for the three-dimensional behavior of open pits.

scholarly journals Stability Assessment and Optimization Design of Lakeside Open-Pit Slope considering Fluid-Solid Coupling Effect

2015 ◽  
Vol 2015 ◽  
pp. 1-11
Author(s):  
Wenchen Fan ◽  
Ping Cao ◽  
Ke Zhang ◽  
Kaihui Li ◽  
Chong Chen
Keyword(s):  
Slope Stability ◽  
Water Level ◽  
Lake Water ◽  
Optimization Design ◽  
Great Influence ◽  
Water Levels ◽  
Open Pit ◽  
Stability Of Slopes ◽  
The Stability ◽  
Slope Design

Chengmenshan copper mine, located at Jiujiang city in the Jiangxi Province, is a rarely lakeside open-pit mine in China. Since the open-pit is very close to Sai Lake, the seasonally changed water level and the distance between lake and slope have great influence to the stability of open-pit slope. Based on the drill data and geological sections, a numerical model of the slope is built. With the fluid-mechanical interaction associated, the stability of the slopes is numerically analyzed, in which different lake water levels and lake-slope distances are taken into consideration. The comparative analysis shows that a larger lake-slope distance can promise better slope stability and weaken the sensitivity of slope stability to water. The stability of slopes with different heights is analyzed to find that the stability weakens and the sensitivity is enhanced with the height increasing. To the most serious situation, the slope height and the lake water level being 238 m and 17.2 m, respectively, theFsvalue equals 1.18945 which is extremely closed to the allowable safety factor of 1.20 for slope design. According to the minimumFsfor slope design, the minimum distance between lake and open-pit slope is found to be 60 m.

Geotechnical assessments of the stability of slopes at the Cakmakkaya and Damar open pit mines (Turkey): a case study

2009 ◽  
Vol 61 (4) ◽  
pp. 741-755 ◽  
Author(s):  
Fehmi Arikan ◽  
Fatih Yoleri ◽  
Sureyya Sezer ◽  
Dincer Caglan ◽  
Bengu Biliyul
Keyword(s):  
Open Pit ◽  
Open Pit Mines ◽  
Stability Of Slopes ◽  
The Stability

scholarly journals Real-time monitoring and FEMLIP simulation of a rainfall-induced rockslide

2019 ◽  
Vol 19 (1) ◽  
pp. 153-168 ◽  
Author(s):  
Zhaohua Li ◽  
Zhigang Tao ◽  
Yuanjun Jiang ◽  
Qian Lv ◽  
Felix Darve ◽  
...  
Keyword(s):  
Real Time ◽  
Rock Slope ◽  
Water Infiltration ◽  
Liaoning Province ◽  
Open Pit ◽  
Real Time Monitoring ◽  
Weak Zone ◽  
Prediction And Prevention ◽  
Geological Discontinuity ◽  
The Stability

Abstract. Rockslides are a common and devastating problem affecting mining and other engineering activities all over the world; consequently, there have been many studies into their prediction and prevention. This study focused on a recent rockslide in an open-pit mine in Liaoning Province, China. The stability of the rock slope under excavation and rainfall conditions was monitored using an efficient real-time monitoring system. A further numerical analysis was performed using the finite element method with Lagrangian integration points (FEMLIP), and two forms of the normalized global second-order work were calculated to analyze the stability of the rock slope. In fact for the future it would be very interesting to compare measurements and simulations in real time, and not only to develop back computations after failure. The numerical results indicate that the rock slope remained stable during excavation, yet lost stability after subsequent rainfall. Water infiltration, along with a major geological discontinuity, degraded the strength of the weak zone and induced the rockslide. The monitoring approach presented its robustness and generality, and was worth being generalized. The numerical approach proposed the evolution of the safety factor, the monitoring data were compared, and the mechanism of the rockslide was determined. It could be used as an assistant tool for disaster prediction.

Study on Stability and Failure Characteristics of the Slope in Transition from Open-Pit to Underground Mining by Structural Geology

2012 ◽  
Vol 170-173 ◽  
pp. 932-936 ◽  
Author(s):  
Yun Fei Wang ◽  
Fang Cui
Keyword(s):  
Underground Mining ◽  
Structural Features ◽  
Open Pit ◽  
Slope Surface ◽  
Failure Characteristics ◽  
Structure Surface ◽  
Engineering Geological Zoning ◽  
Slope Rock ◽  
The Stability ◽  
The Impact

According to the impact on the slope characteristics, characteristics of underground ore occurrence, underground ore mining, the open pit slope can be separated by engineering geological zoning. After analyzed the factors that affect the stability of the slope rock, such as the combination relation between the slope surface and the structure surface, deposits of occurrence conditions, structural features and so on. The combination of cutting and under the action of the form may be made of the damage and determine the stability of the various partitions.

scholarly journals Restrictions on seismic impact of blast in the open-pit border zone at the open-pit and combined mining

2019 ◽  
Vol 129 ◽  
pp. 01001 ◽  
Author(s):  
Vyacheslav Kutuev ◽  
Sergey Zharikov
Keyword(s):  
Rock Mass ◽  
Underground Mining ◽  
Negative Impact ◽  
Seismic Effect ◽  
Border Zone ◽  
Open Pit ◽  
Main Task ◽  
The Stability ◽  
Seismic Impact ◽  
Drill And Blast

The combined mining under the condition of underground mining in the aquifer rock mass of the open-pit sides raises an acute issue of joint drill-and-blast works (D&B). The construction of an underground mine begins normally with the approach of the open-pit mine depth to the final marks. In this situation, if there is a volume for the cutback, it is very small, and the blast works come close to the limit open-pit contour, behind which the protected rock mass is located and in the future the underground mining is supposed to be carried out. The main task in the drill-and-blast works under such conditions is to preserve the stability of this rock mass. The well-timed shielding of the blast and creating the fracture surfaces by the trim blasting reduce the negative impact of the blast on the open-pit side, but do not always prevent the propagation of stress waves caused by the seismic effect along the rock mass. Therefore, restriction of the seismic effect of blast in the border zone is as important for the stability of the rock mass as professional deviated contour holes.

scholarly journals Determination of non-hazardous areas in terms of seismic effect for the use of explosives in the open pit in safe conditions

2022 ◽  
Vol 354 ◽  
pp. 00035
Author(s):  
Edward Gheorghiosu ◽  
Daniela Rus ◽  
Ștefan Ilici ◽  
Sorin Mihai
Keyword(s):  
Seismic Waves ◽  
Seismic Intensity ◽  
Seismic Effect ◽  
Open Pit ◽  
Open Pit Mining ◽  
Mining Operations ◽  
Industrial Buildings ◽  
The Stability ◽  
Mining Work

In addition to the technical and economic advantages of blasting rocks from open-pit mining, this method of extraction can produce effects with a direct impact in the area near the open pit. Blasting works generates effects such as seismic waves that cause vibrations, rock throws, noise and toxic gases. When their intensity and scope are not systematically evaluated and analysed, blasting works can cause serious consequences for people, civil / industrial buildings, the environment, thus affecting the health of the population and the stability / integrity of the buildings / slopes in the vicinity of the mining operations. The paper presents design / determination methods of areas where explosives may / may not be used in conditions of maximum safety in terms of seismic intensity, thus protecting the population and the civil / industrial objectives in the area of the mining work. The obtained results are extracted from a research study carried out for the opening in operation of a new mining deposit, having as reference calculations and theoretical interpretations related to the conditions established for the development of the blasting works.

scholarly journals Terrestrial photogrammetry at the quarry and validating the accuracy of slope models for monitoring their stability

2021 ◽  
Vol 906 (1) ◽  
pp. 012062
Author(s):  
Dima Ozhygin ◽  
Václav šafář ◽  
Dmitrij Dorokhov ◽  
Svetlana Ozhygina ◽  
Sergey Ozhygin ◽  
...  
Keyword(s):  
Geodetic Network ◽  
Open Pit ◽  
Survey Method ◽  
Reference Network ◽  
Surface Model ◽  
Mining Operations ◽  
Open Pit Mines ◽  
Total Station ◽  
Stability Of Slopes ◽  
Terrestrial Photogrammetry

Abstract The paper is devoted to the application of photogrammetry in surveying and geomechanical studies of the state of stability of slopes in a quarry. For deep quarries a particularly important task is to ensure the stability of the slopes of the benches. The purpose of this study is to improve the survey techniques of the slopes using terrestrial photogrammetry, the establishment of the values of the basic errors in the positioning of cameras in local geodetic network. The results of photogrammetric measuring data processing, which are the coordinates of the slope points and its elements, point cloud, surface model, volume and area data, improve the quality of geomechanical monitoring at mining enterprises and provide increase safety of mining operations. The proposed method of survey consists in positioning images (projection centres) in the system of the geodetic reference network by measuring with an electronic total station. Established during the study was dependence of the accuracy of the coordinates of the three-dimensional model of the slopes on the distance between the camera and the total station, between the camera positions in a pair of images. The article contains the results of the practical implementation of the proposed survey method, the results of experiments performed for the purpose of comparison with an alternative measurement method, which was a survey by a total station, graphs of dependencies describing the effect of measurement parameters on the accuracy of work performed. The article is also supplemented by a theoretical analysis of the use of UAVs in the use of work to determine of stability of slopes in a quarry, which is based on the authors’ experience with the use of UAVs in open pit mines. In this theoretical comparison, the emphasis is mainly on the operability of the use of UAV, which in the case of open pit mines creating a practically stable wind vortex with a speed higher than the allowed speed of operation rotors UAVs.

scholarly journals METHODOLOGY OF INSTRUMENTAL CONTROL OF STABILITY OF QUARRY SLOPES USING GNSS TECHNOLOGIES

2020 ◽  
Vol 1 (1) ◽  
pp. 161-168
Author(s):  
Ekaterina V. Sitnikova ◽  
Elena N. Hmyrova ◽  
Dmitry S. Ozhigin
Keyword(s):  
Iron Ore ◽  
Satellite Observations ◽  
Open Pit ◽  
Main Task ◽  
Efficient Operation ◽  
Ore Deposit ◽  
Iron Ore Deposit ◽  
The Stability ◽  
Favorable Conditions ◽  
Instrumental Control

The article describes the methodology of instrumental monitoring of the stability of Karatemir open pit slopes using GNSS technologies. An iron ore deposit was selected to carry out the study. The exploitation of subsurface use facilities developed in an open way requires regular monitoring of the stability state of the instrument array. This is the main task for the safe and efficient operation of the entire field. The favorable conditions for conducting observations and the accuracy of satellite observations are also described. The analysis of the stability status of career slopes.

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