TO THE ISSUE OF SYSTEMATIZATION OF GEOPHYSICAL STUDIES OF THE GEOMECHANICAL STATE OF ROCK MASS AND THE EARTH'S SURFACE FOR OPERATIONAL MONITORING OF THE SAFETY OF MINING IN COAL MINES

Ugol ◽  
2019 ◽  
pp. 29-33
Author(s):  
A.P. Egorov ◽  
◽  
V.A. Ryzhov ◽  
Keyword(s):  
Rock Mass ◽  
Coal Mines ◽  
Operational Monitoring ◽  
Geomechanical State

scholarly journals The Direction of Drilling Wells as a Factor of Improving the Crushing of Sedimentary

2019 ◽  
Vol 105 ◽  
pp. 01053
Author(s):  
Igor Katanov ◽  
Andrey Sysoev ◽  
Ivan Panachev
Keyword(s):  
Rock Mass ◽  
Coal Mines ◽  
Sedimentary Rocks ◽  
Specific Consumption ◽  
Theoretical Reasoning ◽  
Explosive Charges ◽  
Positive Effect ◽  
Explosive Destruction

The task of the work is to improve the quality of preparation of the rock mass for excavation. Explosive destruction of the rock is based on several theories developed by well-known scientists. The improvement of quality of preparation of rock mass to excavation without an increase in the value of specific consumption of explosives is important in the present time. The analysis of scientific works and industrial results of explosive preparation of the overburden removal is made. It is established that depending on the angle of the explosive charges meeting with the rock layers, the quality of its crushing changes. Modern drilling machines can drill at any angle. It is proposed to drill wells perpendicular to the rock layers. The proposal differs in originality from the previously known principles of charge placement of explosives in wells. This method of charge placement has a positive effect in sedimentary rocks in coal mines. The results of industrial explosions in coal mines have confirmed the theoretical reasoning.

CALCULATION OF THE GEOMECHANICAL STATE OF MINE WORKING SUPPORT AND SURROUNDING ROCK MASS IN CONDITIONS OF MINING ORE DEPOSITS IN EAST KAZAKHSTAN

2020 ◽  
Vol 2 ◽  
pp. 89-97
Author(s):  
Andrey A. Krasnovsky ◽  
Viktor M. Seryakov ◽  
Yuri N. Shaposhnik ◽  
Denisi A. Shokarev
Keyword(s):  
Rock Mass ◽  
Mine Working ◽  
Strain State ◽  
Ore Deposits ◽  
Surrounding Rock ◽  
Stress Fields ◽  
Uniform Pressure ◽  
Stress Strain ◽  
East Kazakhstan ◽  
Geomechanical State

The statement of the problem of determining the stress-strain state of support and rock mass around the mine working in unstable rocks, in case of voids filling with phenol resins is proposed. The initial parameters used in the calculations correspond to the conditions of mining ore deposits in East Kazakhstan. The distribution character of stress fields in the support and their change depending on geometric sizes of the area filled with phenol resins is determined. It is shown that using phenol resins causes formation of a uniform pressure of surrounding rocks on the arch part of the support and facilitates an increase in its stability.

Evaluation of the geomechanical state of a rock mass in working deposits in a cryolithozone

1993 ◽  
Vol 29 (3) ◽  
pp. 217-220
Author(s):  
V. Yu. Izakson ◽  
V. G. Grinev ◽  
A. V. Samokhin ◽  
G. P. Neobutov ◽  
S. P. Shkulev
Keyword(s):  
Rock Mass ◽  
Geomechanical State

scholarly journals Physical, technological and technical characteristics of the blasted rock mass in terms of energy intensity of the processes

2021 ◽  
Vol 303 ◽  
pp. 01034
Author(s):  
Ivan Panachev ◽  
Ilya Kuznetsov ◽  
Anastasia Shirokolobova
Keyword(s):  
Rock Mass ◽  
Energy Consumption ◽  
Specific Energy ◽  
Energy Intensity ◽  
Coal Mines ◽  
Specific Energy Consumption ◽  
Rock Blasting ◽  
Mining Equipment ◽  
The Relationship

Kuzbass coal mines are equipped with powerful mining equipment; it is CME excavator type with bucket capacity from 4.6 m3 to 20 m3. To evaluate the efficiency of the excavation processes, a universal criterion was used – the value of specific energy consumption (kW h/m3). The dependences of excavator efficiency on the quality of rock blasting, estimated by the diameter of the average piece in the shot pile, are obtained. The relationship between the efficiency of excavators CME - 4.6, CME – 8, CME – 12.5, CME – 20, their energy intensity and the diameter of an average piece in the shot pile is determined.

scholarly journals Experimental Study on Comprehensive Real-Time Methods to Determine Geological Condition of Rock Mass along the Boreholes while Drilling in Underground Coal Mines

2019 ◽  
Vol 2019 ◽  
pp. 1-17 ◽  
Author(s):  
Ganggang Niu ◽  
Kai Zhang ◽  
Bosong Yu ◽  
Yanlong Chen ◽  
Yu Wu ◽  
...  
Keyword(s):  
Rock Mass ◽  
Real Time ◽  
Coal Mines ◽  
Vibration Measurement ◽  
Geological Condition ◽  
Camera System ◽  
Underground Coal Mines ◽  
Measurement While Drilling ◽  
Borehole Camera ◽  
Rock Mass Condition

The geological condition is essential for mining design and disaster control in underground coal mines. The present research focuses on the real-time assessment method on rock mass condition during drilling boreholes. In situ comprehensive experiments were carried out using three methods, which are measurement while drilling (MWD) system, vibration measurement while drilling (VMWD) system, and borehole camera detecting system. In the MWD system, the operating parameters of the drilling machine were recorded, and a dimensionless index Id based on the collected parameters was adopted to assess the geological condition along the borehole. The results show that the state of rock mass can be well classified using the MWD system for both the cross-layer and in-seam boreholes. In the VMWD system, the vibration of the drilling bit was monitored, and the signal was analyzed in both time domain and frequency domain. The results indicate that the rock mass condition can be quantitatively evaluated using the mean square value of the signal and qualitatively estimated using the energy of the spectrum. In the borehole camera system, the photos of the rock mass along the borehole could be well captured, and the identified rock mass condition was used to verify the results of the MWD and VMWD systems. Comprehensive compassion between the results from the three systems shows that all the methods can give valuable information for the geological condition, and the outcomes of the different methods are generally comparable. For practical purposes, the advantages of the involved three detecting systems are discussed.

scholarly journals A Novel in Situ Stress Monitoring Technique for Fracture Rock Mass and Its Application in Deep Coal Mines

2019 ◽  
Vol 9 (18) ◽  
pp. 3742 ◽  
Author(s):  
Bin Liu ◽  
Yuanguang Zhu ◽  
Quansheng Liu ◽  
Xuewei Liu
Keyword(s):  
Rock Mass ◽  
Coal Mines ◽  
Three Dimensional ◽  
In Situ Stress ◽  
Hole Drilling ◽  
Stress Monitoring ◽  
Underground Engineering ◽  
In Situ Tests ◽  
Monitoring Method

A novel in situ stress monitoring method, based on rheological stress recovery (RSR) theory, was proposed to monitor the stress of rock mass in deep underground engineering. The RSR theory indicates that the tiny hole in the rock can close gradually after it was drilled due to the rheology characteristic, during which process the stress that existed in the rock can be monitored in real-time. Then, a three-dimensional stress monitoring sensor, based on the vibrating wire technique, was developed for in field measurement. Furthermore, the in-field monitoring procedures for the proposed technique are introduced, including hole drilling, sensor installation, grouting, and data acquisition. Finally, two in situ tests were carried out on deep roadways at the Pingdingshan (PDS) No. 1 and No. 11 coal mines to verify the feasibility and reliability of the proposed technique. The relationship between the recovery stress and the time for the six sensor faces are discussed and the final stable values are calculated. The in situ stress components of rock masses under geodetic coordinates were calculated via the coordinate transformation equation and the results are consistent with the in situ stress data by different methods, which verified the effectiveness of the proposed method.

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