Development of Technology for Seismic Diagnostics of Rock Mass Conditions above the Production Working when Mining Coal Seams Prone to Geo-Dynamic Phenomena

2014 ◽  
Vol 10 (6) ◽  
pp. 52-54
Author(s):  
A. Trifonov ◽  
Keyword(s):  
Rock Mass ◽  
Coal Seams ◽  
Mining Coal ◽  
Dynamic Phenomena

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 Peculiarities of using classification indicators of the coal metamorphism degree for predicting the hazardous coal seams properties

2020 ◽  
Vol 201 ◽  
pp. 01014
Author(s):  
Mykola Antoshchenko ◽  
Elvira Filatieva ◽  
Vladyslav Yefimtsev ◽  
Vadym Tarasov
Keyword(s):  
Spontaneous Combustion ◽  
Chemical Activity ◽  
Mining Engineering ◽  
Coal Seams ◽  
Mining Operations ◽  
Emergency Situations ◽  
Specific Composition ◽  
Geological Conditions ◽  
Definition Of ◽  
Mining Coal

Currently, there is no reliable regulatory framework for determining the hazardous properties of coal seams, including the propensity of coal for spontaneous combustion. Under relatively identical mining engineering and geological conditions for mining coal seams, the probability of emergency situations is determined to a large extent by the genetic properties of coal. The research methodology is based on the classical definition of metamorphism, which characterizes the change in the composition and properties of coal. The analysis involves indicators that directly or indirectly characterize the elemental composition of organic and mineral mass, chemical activity and physico-mechanical properties. This will allow to establish a specific composition and properties that contribute to the manifestation of certain hazardous properties of coal seams during mining operations. It is shown that the modern industrial classification does not take into account the change in the organic and mineral constituents of coal, which does not make it possible to use it unchanged to predict the hazardous properties of coal seams.

Underground operations in Internatsionalny mine rock mass susceptible to gas dynamic phenomena

2021 ◽  
pp. 76-80
Author(s):  
A. A. Vyunikov ◽  
◽  
S. G. Vorozhtsov ◽  
N. V. Khoyutanova ◽  
E. K. Pul ◽  
...  
Keyword(s):  
Rock Mass ◽  
Prediction Method ◽  
Test Site ◽  
Gas Release ◽  
Prevention Measures ◽  
Science Center ◽  
Gas Dynamic ◽  
Prediction And Prevention ◽  
Engineering Sciences ◽  
Dynamic Phenomena

Starting from 2019 extraction of diamond ore reserves from Internatsionalnaya pipe by Internatsionalny mine of ALROSA is carried out in complex geological and geomechanical conditions. Geodynamic situation is complicated by a few gas dynamic phenomena of different nature and scale recorded. The investigation results on gas release dynamics from dolomite rock mass during drivage of Spiral decline, in a test site on level.-802/-820 m in case of prediction and prevention measures undertaken to combat gas dynamic phenomena are presented. The dynamic characteristics of gas in outburst-hazardous dolomite rocks are calculated by the initial velocity of gas release. Efficiency of the current outburst hazard prediction method using facility MIG-Ts1 is proved. At the same time, it is necessary to perform additional studies to collect sufficient statistics and reliable data on gas release and gas pressure during drivage operations in the mine. The authors appreciate participation of Deputy CEO of VostNII Science Center, Doctor of Engineering Sciences, Professor V. S. Zykov, Doctor of Engineering Sciences, Professor A. V. Dzhigrin, Director of Research Center for Applied Geomechanics and Convergent Technologies in Mining at NUST MISIS College of Mining, Doctor of Engineering Sciences, Professor of the Russian Academy of Sciences V. A. Eremenko and Director of VNIMI’s Kemerovo Division, Candidate of Engineering Sciences P. V. Grechishkin.

scholarly journals Operational Control of the Feed of the Harvester

2019 ◽  
Vol 105 ◽  
pp. 01009
Author(s):  
Sergey Kubrin ◽  
Konstantin Kopylov
Keyword(s):  
Operational Control ◽  
Coal Seams ◽  
Mining Operations ◽  
Technological Processes ◽  
Mining Enterprise ◽  
Geological Conditions ◽  
Operational Management ◽  
Mining Coal ◽  
The Right ◽  
Planning Production

Comparison of normative and actual indicators on mining testifies to inefficient work of the excavating equipment. The results of the correlation analysis of the speed of movement of the harvester relative to the section of the support with the readings of methane sensors revealed a significant dependence. When conducting mining operations in complex geological conditions at great depths, a joint step-by-step carrying out of various technological processes is required to ensure the preparation, opening and excavation of reserves and the creation of safe conditions for mining coal seams. At the same time, efforts should be made to minimize time, human and energy resources. In this regard, of particular importance is the right choice of the program of operational management of technological processes of mining, monitoring the implementation of technological operations for the timely detection of deviations from the selected mode, adjustment of the established current modes of operation of technological processes and the development, if necessary, measures aimed at reducing the risks of accidents. A promising direction of solving this problem is the use of modeling methods. The developed models of technological processes of the mining enterprise will allow planning production and supporting decision-making in the implementation of operational management.

scholarly journals The results of monitoring of hydroimpulsive disintegration of outburst-prone coal seams using ZUA-98 system

2020 ◽  
Vol 168 ◽  
pp. 00068
Author(s):  
Vasyl Zberovskyi ◽  
Kostiantyn Sofiiskyi ◽  
Rishard Stasevych ◽  
Artem Pazynych ◽  
Jan Pinka ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Rock Mass ◽  
Coal Seam ◽  
High Frequency ◽  
Strain State ◽  
Monitoring And Evaluation ◽  
Dynamic State ◽  
Coal Seams ◽  
Gas Dynamic ◽  
Mine Workings

The paper represents the results of monitoring and evaluation of the efficiency of hydroimpulsive disintegration of outburst-prone coal seams in the stopes of development mine workings using a system of sound detecting facilities. Methods of acoustic emission control have been considered as well as the monitoring tasks to evaluate rock mass conditions before the procedure and after it inclusive of the results of sound accompaniment of hydraulic disintegration of the coal seam. It has been determined that the higher concentration of stresses within the rock mass is, the more efficient action of high frequency self-oscillations of cavitation transmitter is on both the fissuring and changes in gas-dynamic state of the coal seam. It has been recommended to apply a mode of impulsive fluid pumping under the conditions where coal seam is in the stress-strain state.

A possibilities of dangerous dynamic phenomena prediction in a rock mass surrounding the excavations

2014 ◽  
Author(s):  
A. A. Cherepov ◽  
M. O. Eremin ◽  
P. V. Makarov ◽  
A. Yu. Peryshkin
Keyword(s):  
Rock Mass ◽  
Dynamic Phenomena

Research on Combined Tests to Entry Disturbed Zone (EDZ) of Rock Masses in Steep Coal Seams

2013 ◽  
Vol 718-720 ◽  
pp. 842-847
Author(s):  
Peng Fei Shan ◽  
Xing Ping Lai ◽  
Jian Tao Cao ◽  
Lin Yao Li
Keyword(s):  
Rock Mass ◽  
Ground Penetrating Radar ◽  
Rock Masses ◽  
East Side ◽  
Coal Seams ◽  
Disturbed Zone ◽  
Explosive Wave ◽  
High Production ◽  
Ground Penetrating

For high production of raw coal in steep coal seams, it is crucial to obtain engineer demands by enhancing section height in horizontal caving. However in-situ operations copious methods like pre-blasting was always needed to broken top-coal which was difficult to excavate commodiously and safely. Explosive wave caused by pre-blasting would destroy stress balance around entries, and definitely result in entry disturbed zone (EDZ) being loosen zone. Aimed to determine boundary of EDZ and keep rock mass in both entries steady, combined tests to EDZ of rock masses of head entry of +600 east-side stope of 43# coal seam was done in Wudong Colliery as research background with ground penetrating radar (GPR) and mono-hole ultrasonic wave experiment. It indicated that scope of EDZ here was 2.2-2.3m, which would be prerequisite to optimize supporting scheme in field.

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