scholarly journals Substantiation of the method ensuring the safe development of the pit reserves of kimberlite ore deposits in the conditions of the Udachny mine

2021 ◽  
Vol 266 ◽  
pp. 03013
Author(s):  
K. A. Anisimov ◽  
V. P. Zubov
Keyword(s):  
Ore Deposits ◽  
Underground Mine ◽  
Rock Massif ◽  
Mining Operations ◽  
Pressure Drops ◽  
Low Coherence ◽  
Ore Bodies ◽  
Edge Part ◽  
Underground Mine Workings ◽  
Mine Workings

The paper discusses the features of the development of pit reserves of the Udachnaya diamondiferous pipe which consists of two closely spaced ore bodies under the protection of a moving ore-rock massif (a safety cushion). Low stability of the rock massif located between the ore bodies is indicated. Such low stability is caused by the presence of areas of increased intensity of fracturing and low coherence zones in the massif; it is also caused by the mutual impact of mining operations carried out in closely located ore bodies. A conclusion is made about the danger of collapse of sizeable rock blocks from the edge zones of the rock massif located between the ore bodies onto the safety cushion. In this case, individual rock blocks can be 0.4-0.6 tons or more, the drop height is up to 600-700 m. Impact blows on the safety cushion when rock blocks collapse onto it can cause a disruption of underground mine workings stability and occurrence of dangerous pressure drops at the outlet of air waves from the safety cushion into the underground mine workings. A method for preventing dangerous impact blows is proposed, which consists in the forced collapse (with certain parameters) of the edge part of the rock massif located between the ore bodies, onto the safety cushion.

Stability Evaluation of Old and Unapproachable Underground Mine Workings below Surface Structures

2019 ◽  
Vol 93 (3) ◽  
pp. 351-359 ◽  
Author(s):  
Angad Kushwaha ◽  
Subhashish Tewari ◽  
Prabhat Kumar Mandal ◽  
Rana Bhattacharjee ◽  
Arka Jyoti Das ◽  
...  
Keyword(s):  
Underground Mine ◽  
Surface Structures ◽  
Stability Evaluation ◽  
Underground Mine Workings ◽  
Mine Workings

GPR measurements for locating underground mine workings at an active open-pit mine

1992 ◽  
Author(s):  
Jeffrey J. Daniels ◽  
Dwayne Harris ◽  
Roger Roberts ◽  
Brian Schilling
Keyword(s):  
Open Pit Mine ◽  
Underground Mine ◽  
Open Pit ◽  
Underground Mine Workings ◽  
Mine Workings

Modelling of radon hazards in underground mine workings

2019 ◽  
Vol 695 ◽  
pp. 133853 ◽  
Author(s):  
Krystian Skubacz ◽  
Małgorzata Wysocka ◽  
Bogusław Michalik ◽  
Wacław Dziurzyński ◽  
Andrzej Krach ◽  
...  
Keyword(s):  
Underground Mine ◽  
Underground Mine Workings ◽  
Mine Workings

scholarly journals Improving the efficiency of tunneling underground mine workings with the use of blasthole charges with Munroe effect

2020 ◽  
pp. 15-23
Author(s):  
Farkhodbek Umarov ◽  
◽  
Utkir Nasirov ◽  
Gafur Nutfulloev ◽  
Zoir Nazarov ◽  
...  
Keyword(s):  
Rock Mass ◽  
Explosive Charge ◽  
Underground Mine ◽  
Theoretical Research ◽  
Hydrodynamic Theory ◽  
Energy Concentration ◽  
Face Advance ◽  
Efficiency Ratio ◽  
Underground Mine Workings ◽  
Mine Workings

Introduction. Various techniques of breaking rock by explosion have currently been developed when tunneling underground mine workings, but asymmetrically directed stress fields application is of the main interest. Research aim is to study explosion energy distribution and maximum concentration deep down the blasted rock mass. Blast energy concentration may be achieved by using the principle of cumulation in the hole back by means of changing the design of the blasthole explosive charge. Methodology. Based on the analyzed literature and theoretical research it is recommended to use the design of a blasthole explosive charge with the use of Munroe effect, which makes it possible to increase the blasthole efficiency ratio (BER), reduce drilling activity, reach sharper design contours of mine workings and eliminate bootlegs. The action of blasthole explosive charges with Munroe effect has been theoretically investigated, hydrodynamic theory of cumulation has been studied, and the dependences have been determined between the liner’s collapsing angle alternation and the radius of the cone, its height, initial velocity, and cumulative jet velocity. Results. The main factors which determine the efficiency of the proposed new technique of blasting against the basic technique are the blasthole efficiency ratio, face advance pace after one blast, the amount of rock mass detached after one blast, and the granulometric composition of the blasted rock mass. Summary. The developed design of the blasthole explosive charge with Munroe effect makes it possible to increase BER, face advance per one cycle, and increase the amount of the broken rock mass.

scholarly journals Analysis of efficiency of drilling equipment use in mining operations

2021 ◽  
Vol 315 ◽  
pp. 02018
Author(s):  
Yuriy Masaev ◽  
Vladislav Masaev ◽  
Yuriy Drozdenko
Keyword(s):  
Mechanical Properties ◽  
Energy Intensity ◽  
Physical And Mechanical Properties ◽  
Structural Features ◽  
Ore Deposits ◽  
Mining Operations ◽  
Drilling Equipment ◽  
Wide Range ◽  
Mine Workings ◽  
Underground Method

When developing coal and ore deposits by underground method, it is necessary to carry out a large volume of preparatory mine workings using drilling and blasting operations. Minerals are found in rocks under various conditions and their physical and mechanical properties change in a wide range. Under such conditions, it is necessary to use drilling machines this different to the principle of action and structural features. The article considers geometric parameters of roc cutters, peculiarities of drilling modes, affecting energy intensity and drilling productivity in rocks with different strength coefficient.

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