scholarly journals Assessing the quality of drilling-and-blasting operations at the open pit limiting contour

2021 ◽  
pp. 42-48
Author(s):  
B Hussan ◽  
M.I Lozynska ◽  
D.K Takhanov ◽  
A.O Oralbay ◽  
S.L Kuzmin
Keyword(s):  
Rock Mass ◽  
Blast Waves ◽  
Open Pit ◽  
Elastic Response ◽  
Final Position ◽  
Geological Conditions ◽  
Drilling Quality ◽  
Seismic Vibrations ◽  
Seismic Impact

Purpose. To develop a methodology for assessing the quality of drilling-and-blasting operations when setting the side to the final position. In this regard, it is necessary to study the nature of deformations in the near-side masses of the design open-pit contours and to assess the seismic impact of blast waves in accordance with damage in the near and far zones from the open-pit boundary, as well as the level of generated seismic vibrations. Methodology.A methodology for assessing the quality of drilling-and-blasting operations at the limiting contour of open pits is developed using the analysis of the mining-and-geological conditions of the rocks constituting the field, in-situ surveying of the state of the open-pit sides, analysis of the physical-mechanical properties of the host rocks, analytical studies and instrumental measurements of the blasting effect. Findings.Based on the analytical methods, the calculation and analysis of the seismicity coefficient of the rocks at the field have been performed. By means of instrumental measurement of the blasting effect in open pit, data have been obtained on the seismic impact of blasting operations on the near-side mass. Based on the results of these works, a methodology for assessing drilling-and-blasting operations at the limiting contour of the open pit has been developed. Originality.In this work, to assess the blasting effect, the seismicity coefficient of the rock mass is used, which characterizes the degree of elastic response to external dynamic influence and is a parameter that determines the elastic seismic wave intensity with distance from the site of blasting operations. Based on the calculation, a map of the seismicity coefficient distribution in the open-pit area has been compiled. Using the method of instrumental measurements, which serves to determine the seismic impact of blasting on a rock mass, the degree of blasting effect on a near-side mass has been revealed. This made it possible to develop a method for assessing the blasting quality, based on determining the percentage of permissible deviations in the face drilling quality. Practical value.The results of the work will be used to calculate the safe parameters of conducting the blasting operations when setting the side to the final position. This method for assessing the quality of drilling-and-blasting operations can be applied at any mining enterprise conducting open-cut mining of minerals.

scholarly journals The effect of blasting on a high-pressure gas pipeline located within the borders of a mine take

2020 ◽  
pp. 50-60
Author(s):  
Viacheslav Kutuev ◽  
◽  
Sergei Zharikov ◽  
Keyword(s):  
High Pressure ◽  
Negative Impact ◽  
Soil Condition ◽  
Gas Pipeline ◽  
Open Pit ◽  
Geological Conditions ◽  
Seismic Vibrations ◽  
Seismic Impact ◽  
A Charge

Introduction. This article shows the results of investigating the allowable dynamic load on the II category high-pressure gas pipeline installation site located within the borders of a mine take, which is connected with blasting at SLK Cement open pit. Research aim. The research is aimed at increasing the level of secure operation of a gas pipeline and establishing restrictions in the seismic impact of mining (blasting) towards the gas pipeline installation site. Methodology. The methods of IM UB RAS has been applied concerning the determination of allowable distances from a blast in the open pit to the secure facility (gas pipeline) depending on the mass of the explosive at the timing stage, soil condition coefficient, and the allowable speed of seismic vibrations. Results. It has been determined that taking into account the depth of blast in the open pit and corresponding geological conditions, by means of changing mass at the timing stage, it is possible to totally eliminate the negative impact of a blast on a gas pipeline installation site. A design scheme has been proposed to determine secure distances to the high-pressure gas pipeline depending on the angle of open pit slope and the depth of blasting in the open pit. Summary. A dynamic design analysis has been carried out of blasting force action on soil and highpressure gas pipeline. It has been recommended to establish some restrictions in explosive mass at the level of minimum hazardous values. And for the future blasts it is also recommended to design a charge initiation scheme with explosive mass of less than one ton at the timing stage.

scholarly journals Research into influence of drilling-and-blasting operations on the stability of the Kusmuryn open-pit sides in the Republic of Kazakhstan

2021 ◽  
Vol 15 (3) ◽  
pp. 130-136
Author(s):  
Bolatkhan Hussan ◽  
Daulet Takhanov ◽  
Sergey Kuzmin ◽  
Sharabidin Abdibaitov
Keyword(s):  
Rock Mass ◽  
Research Method ◽  
Analytical Calculation ◽  
Physical And Mechanical Properties ◽  
Open Pit ◽  
Seismic Stability ◽  
Joint Research ◽  
Rock Hardness ◽  
Geological Conditions ◽  
Seismic Impact

Purpose. Research into influence of drilling-and-blasting operations on the nature of deformation in near-side masses of the design open-pit contours and assessing the seismic impact of blasting operations, which are the basis for development of recommendations on the rational parameters of drilling-and-blasting operations. Methods. The influence of drilling-and-blasting operations at the limiting contour of the Kusmuryn field is studied using the analysis of the mining-and-geological conditions and tectonics of the rocks constituing the field, in-situ surveying the state of the open-pit sides, analysis of the physical and mechanical properties of the host rocks, analytical studies and instrumental measurements of the blasting effect. Findings. Based on the analytical methods, the calculation and analysis of the seismic stability of the rocks at the field have been performed. By means of instrumental measurement of the blasting effect in open pit, data have been obtained on the seismic impact of blasting operations on the near-side masses. According to the results of these works, rational parameters of drilling-and-blasting operations at the limiting contour of the open pit have been determined. In addition, the main provisions for the organization of drilling-and-blasting operations at the limiting contour of the open pit have been developed. Originality. In this work, for the first time, a joint research method is applied, which includes an analytical calculation of the shock wave seismic impact on a rock mass, based on the results of which the dependency graphs have been obtained of the seismicity coefficient on the rock hardness coefficient at the Kusmuryn field according to the Protodyakonov scale for various explosives, as well as using the method of instrumental measurements, which serves to determine the seismic impact of an explosion on a rock mass. This makes it possible to substantiate the technology of conducting the drilling-and-blasting operations at the contour, providing a long-term stable position of the permanent side of the open pit. Practical implications. The results of the work will be used to calculate the safe parameters of conducting the blasting operations when placing the side in the final position at the Kusmuryn field. This research method can be applied at any mining enterprise conducting open-cut mining of minerals.

scholarly journals Substantiation of Safe Conditions During Undermining of Hydraulic Waste Disposal

2018 ◽  
Vol 41 ◽  
pp. 01007
Author(s):  
Yuriy Kutepov ◽  
Aleksandr Mironov ◽  
Maksim Sablin ◽  
Elena Borger
Keyword(s):  
Rock Mass ◽  
Waste Disposal ◽  
Coal Mine ◽  
Water Body ◽  
Water Inflow ◽  
Open Pit ◽  
Coal Seams ◽  
Geological Conditions ◽  
Mine Workings ◽  
Mine Dump

This article considers mining and geological conditions of the site “Blagodatny” of the mine named after A.D. Ruban located underneaththe old open pit coal mine and the hydraulic-mine dump. The potentially dangerous zones in the undermined rock mass have been identified based onthe conditions of formation of water inflow into mine workings. Safe depthof coal seams mining has been calculated depending on the type of water body – the hydraulic-mine dump.

scholarly journals Analysis of engineering geology conditions based on the quality of rock mass in the Tiga Dihaji Dam’s diversion tunnel, South Sumatera, Indonesia

2021 ◽  
Vol 325 ◽  
pp. 05001
Author(s):  
Zekrinaldi ◽  
Ferian Anggara ◽  
Hendy Setiawan
Keyword(s):  
Rock Mass ◽  
Geological Strength Index ◽  
Strength Index ◽  
Diversion Tunnel ◽  
Rock Mass Quality ◽  
Geological Conditions ◽  
Q System

This research has examined the rock mass quality case study in the Tiga Dihaji Dam’s diversion tunnel. Observations of geological conditions were carried out on the surface and subsurface of the study site and show that the study area consists of tuffaceous sandstone and carbonate interbeds. The method of this study is based on the classification of the Geological Strength Index (GSI), Rock Mass Rating (RMR), and the Q-system. The results indicate that tuffaceous sandstone has a GSI value of 15 - 87.5 (very poor - very good), RMR 48 - 82 (fair - very good), and Q-system 0.01 – 60.0 (exceptionally poor - very good). Meanwhile, carbonate interbeds have a low value, with a GSI value of 10.5 - 77.5 (very poor to very good), RMR 17.0 – 56.0 (very - poor fair), and Q-system 0 - 35.2 (exceptionally poor - good). Moreover, a correlation was made between rock mass quality for conditions in the study area. The correlation between GSI and RMR was obtained by the equation GSI = 2.2885RMR 82.567 (R2 = 0.6653), RMR and Q-system RMR = 2.0175ln(Q) + 63.061 (R2 = 0.4987), and GSI and Q-system GSI = 7.2119ln(Q) 54.578 (R2 = 0.8095).

Research of seismic influence on buildings and structures of Satka town while exploding explosive works on the Karagayskiy career in constrained conditions

2020 ◽  
pp. 383-398
Author(s):  
P. V. Menshikov ◽  
S. S. Taranzhin ◽  
A. S. Flyagin
Keyword(s):  
Wave Attenuation ◽  
Open Pit ◽  
Seismic Safety ◽  
The North ◽  
Industrial Buildings ◽  
Pump Station ◽  
Geological Conditions ◽  
Seismic Vibrations ◽  
Water Pipeline ◽  
Chelyabinsk Region

The analysis of methods for determining the permissible speed of seismic vibrations of the soil at the base of the protected objects of Satka town. The maximum permissible values of the rate of vibration of the soil were determined for the buildings and structures of the industrial site of the Karagaiskiy quarry of the mining enterprise PJSC “Kombinat “Magnezit” (buildings of the administrative household plant, underground steel water pipeline, pump station), as well as for residential and industrial buildings. Approximating functions are constructed and empirical correlation equations are obtained for the mining and geological conditions of the Karagaiskiy quarry, confirming the equation of M.A. Sadovskiy. Actual seismicity coefficients and seismic wave attenuation indices were determined based on instrumental measurements of the speed of seismic vibrations of soil at positive and negative rock temperatures from 2004 to 2019 for the geological conditions of the Karagaiskiy open pit in order to refine and evaluate the seismic safety of residential and industrial buildings, structures and natural infrastructure facilities of Satka town, Chelyabinsk region. Design decisions on the seismic safety of guarded facilities during blasting operations in cramped conditions during mining of the north-western section of the Karagaiskiy quarry were confirmed and the parameters of drilling and blasting operations ensuring the seismic safety of guarded facilities were clarified.

scholarly journals The Use of Self Supporting Capacity of Rock Mass for Sustainable Hydropower: An Analysis of the Middle Marsyangdi Headrace Tunnel, Nepal

1970 ◽  
Vol 6 ◽  
pp. 18-26
Author(s):  
Kiran K. Shrestha ◽  
Krishna K Panthi
Keyword(s):  
Rock Mass ◽  
Stability Analysis ◽  
Concrete Lining ◽  
Rock Support ◽  
Hydroelectric Project ◽  
Tunnel Section ◽  
Geological Conditions ◽  
Headrace Tunnel ◽  
Support Principle

The history of hydropower development in the Himalaya indicates that many tunnels have suffered from cost over- runs and delays. These issues are directly dependent on the quality of rock mass and the permanent rock support applied in underground excavation. Right judgment and proper evaluation of the self supporting capability of the rock mass and the use of optimum rock support systems help considerably in reducing construction cost and delays. This paper examines such issues as geological conditions in the Himalayas and varying approaches and costs in tunnel construction. An assessment is made regarding the exclusion of permanent concrete lining in the headrace tunnel of the 72MW Middle Marsyangdi Hydroelectric Project in Nepal. The project has 5.2 km fully concrete lined headrace tunnel that passes through fair to poor rock mass. The evaluation is based on the use of actually recorded rock mass quality of the headrace tunnel during construction and rock support principle used at the comparable Khimti Hydro Project headrace tunnel. The evaluation includes calculation of equivalent tunnel section for similar headloss, stability analysis, assessment of possible water leakage, and required injection grouting measures. We conclude that the headrace tunnel without permanent concrete lining was possible and would have been equally stable, at considerable fnancial savings.Key words: Equivalent tunnel section; Squeezing; Tunnel lining; Stability analysis; Leakage control; Hydropower; NepalDOI: 10.3126/hn.v6i0.4188Hydro Nepal Vol 6, January 2010Page : 18-26Uploaded Date: 23 January, 2011

scholarly journals The Challenges of Open-Pit Mining in the Vicinity of the Salt Dome (Bełchatów Lignite Deposit, Poland)

Energies ◽  
2020 ◽  
Vol 13 (8) ◽  
pp. 1913
Author(s):  
Marek Cała ◽  
Katarzyna Cyran ◽  
Joanna Jakóbczyk ◽  
Michał Kowalski
Keyword(s):  
Rock Mass ◽  
Large Scale ◽  
Salt Dome ◽  
Open Pit ◽  
Open Pit Mining ◽  
Stability Conditions ◽  
Mining Operations ◽  
Mass Behavior ◽  
Geological Conditions ◽  
Wall Slope

The extraction of the Bełchatów lignite deposit located in the vicinity of the Dębina salt dome requires careful planning that considers the influence of mining projects on the slope and salt dome stability conditions. The instability problem is directly related to horizontal and vertical displacement, as well as the complex geological and mining conditions. These conditions are very unique with regard to the co-occurrence of the salt dome and lignite deposits in the same area, as well as the large scale of the pit wall slope. Thus, predicting rock mass behavior and ensuring the safety of mining operations are important issues. The presented analysis focused on the influence of long-term lignite extraction on the western pit wall slope of the Bełchatów field and the salt dome’s stability conditions. This study offers a comprehensive approach to a complex geotechnical problem defined by large-scale, complex geometry, and geological conditions. The rock mass behavior and stress conditions are simulated in numerical modelling. The results of the presented analysis will be useful not only for present mining activities but also for future developments related to post-mining and recultivation plans.

scholarly journals INCREASING THE EFFICIENCY OF BLASTING WORKS IN THE QUARRY OF BUILDING MATERIALS

2021 ◽  
pp. 7-13
Author(s):  
Sergiy KOZLOV ◽  
Oleg TERENTIEV ◽  
Mykola SERGIENKO
Keyword(s):  
Rock Mass ◽  
Building Materials ◽  
Water Saturation ◽  
Unit Cost ◽  
High Water ◽  
Local Area ◽  
Open Pit ◽  
Open Pit Mining ◽  
Water Saturated

The article is devoted to the urgent problem of increasing the efficiency of blasting operations in open pits in conditions of high water saturation of minerals. The idea of solving this problem is to use the effect of draining the local area of the water-saturated block of the mineral due to the ordinal explosion of the well charge.   The purpose of this study was to improve the efficiency of blasting operations on flooded fractured rocks in open pit mining. Research methodology. The proposed technique makes it possible to determine the parameters of drainage of the watered mass during the explosion of borehole charges and the parameters of an ordinal explosion. This makes it possible to improve the quality of rock crushing and reduce the consumption of explosives per unit cost. The main direction of research in this work is to reduce the energy intensity of the process of destruction of a water-saturated mineral by using the internal potential of water in the cracks of the massif destroyed by the explosion. The regularities and the role of the drainage funnel in the efficiency of destruction have been established. The novelty and originality of the work is a developed technology for removing water from the explosion zone, which increases the efficiency of explosion and destruction of rocks using special water-resistant explosives. The practical value of the work lies in the effectiveness of the proposed method for carrying out blasting operations, which, along with improving the quality of crushing, provides an increase in the output of blasted rock mass from one running meter of the well and reduces the cost of expensive water-resistant explosives. Conclusions. The introduction of research results and recommendations in open pits made it possible to increase the efficiency of blasting operations in the development of water-saturated rocks. Energy consumption for the destruction of an array of water-saturated minerals is reduced by 10%. The amount of blasted rock mass per running meter of the well increased by 14.1%, and the specific consumption of explosives decreased by (12-14) %.         Keywords: quarry, minerals, well, filtration, water-saturated massif, crushing, explosive,  detonation.

scholarly journals Quantifying influence of drilling additional boreholes on quality of geological model

2019 ◽  
Vol 56 (3) ◽  
pp. 347-363 ◽  
Author(s):  
Marie-Hélène Fillion ◽  
John Hadjigeorgiou
Keyword(s):  
Rock Mass ◽  
Drill Hole ◽  
Open Pit ◽  
Hole Density ◽  
Geological Model ◽  
Mine Sites ◽  
Definition Of ◽  
Actual Rock ◽  
Geotechnical Model

Geotechnical stability analysis in open-pit mines requires access to a representative geotechnical model. The confidence level in the collected geotechnical data influences slope design. This paper investigates the influence of the number of boreholes, drilled to collect geological information, on the quality of one component of the geotechnical model, the geological model. The number of boreholes influences the number of rock core samples collected for the identification of rock type, and the definition of geotechnical domains and their boundaries within the rock mass. A challenge in the definition of the geotechnical domains is the determination of the drill hole density that minimizes the variation in the interpreted geological model from the actual rock mass. To quantify the influence of the drill hole density, boreholes are simulated in the most recently updated geological model for three mine sites. The simulated drill hole density is increased progressively until the variation of the interpreted section, compared with the original section, is minimized. A classification strategy was developed to determine the complexity level for each geotechnical domain. Furthermore, a series of empirical quantitative guidelines are presented prescribing the minimum drill hole density per domain complexity, while limiting variations from the actual rock mass.

scholarly journals Study of hydrogeological conditions to ensure security of mining at Sokolovsky iron-ore deposit

2020 ◽  
pp. 133-141
Author(s):  
Timur Sh. Dalatkazin ◽  
◽  
Alfiia N. Kaiumova ◽  
Keyword(s):  
Rock Mass ◽  
Industrial Safety ◽  
Open Pit ◽  
Prevention Measures ◽  
Security Measures ◽  
Field Development ◽  
Hydrogeological Conditions ◽  
Geological Conditions ◽  
Main Production ◽  
Iron Ore Deposit

Introduction. Complex hydrogeological conditions of the rock mass at Sokolovsky deposit are the cause of constant search for new solutions for industrial safety improvement. At the present time there is much information on engineering and geological conditions of the field rock mass which is a source of measures developed to ensure industrial safety and technological solutions in mining. Research aim. With the purpose of determining a tactics of mining security support, the information on the hydrogeological and engineering-geological conditions of Sokolovsky field was analyzed. Methodology. The article provides the details of Sokolovsky field structure. The factors have been revealed which are hazardous for mining: undrained hydrogeological horizons and complexes, karst, thixotropic rock within the open pit. These factors create the conditions for sludge and water accumulation and rush into the underground mine. The majority of sandshale rushes fall upon the main production horizons into the intake and transportation mine workings. Results. Directions have been determined for further investigation of the mechanism of hazardous phenomena development and realization in geological environment of the field; the investigation is directed at improving catastrophe prevention measures and personnel security measures. Summary. Currently, at the stage of field development, there emerged a need to study particular hydrogeological and geomechanical conditions in details in order to increase of effectiveness of drainage at local sites of the mass which are designed for ore extraction.

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