Manifestation of rock pressure while working coal seams by the open/subsurface method

1986 ◽  
Vol 22 (5) ◽  
pp. 388-392
Author(s):  
I. N. Los' ◽  
V. A. Kokovin
Keyword(s):  
Rock Pressure ◽  
Coal Seams

scholarly journals Research of rock pressure manifestations in rocks of parting during descending and simultaneous mining of C9 and C10Top coal seams

2017 ◽  
Vol 11 (1) ◽  
pp. 50-56 ◽  
Author(s):  
I Kovalevska ◽  
◽  
H Symanovych ◽  
M Barabash ◽  
V Snihur ◽  
...  
Keyword(s):  
Rock Pressure ◽  
Coal Seams ◽  
Rock Pressure Manifestations

scholarly journals Experimental Studies about Characteristics of the Rocks Displacement and State of Bearing Pressure on the Haulage Roadway

2019 ◽  
Vol 105 ◽  
pp. 01008
Author(s):  
Duc Thang Pham ◽  
Hung Thang Hoang ◽  
Victor Vitcalov
Keyword(s):  
Rock Pressure ◽  
Roof Rock ◽  
Experimental Studies ◽  
Coal Seams ◽  
Coal Basin ◽  
Mining Depth ◽  
The Face ◽  
Mine Workings ◽  
Roof Rocks ◽  
Quang Ninh

Comprehensive studies were conducted using measuring stations to measure the rock pressure and displacements of the roof rocks in the mine workings adjacent to the face when extracting medium thick inclined coal seams with the use of longwall (seam 6 at the Quang Hanh mine of Quang Ninh coal basin, Vietnam). The results of the study show that the displacement of the roof rock on the parallel roadway increases sharply at a distance of 1 to 12 m to the face, varies from 20 to 40 mm when the mining depth of the coal seam is 200 m and the maximum rock pressure on the haulage roadway supports is located at a distance of 3–8 m ahead of the face and is from 14 to 16 tons ranges.

scholarly journals INVESTIGATION OF THE MANIFESTATIONS OF ROCK PRESSURE IN A DEEP MINE WITH A STEEP OCCURRENCE OF COAL SEAMS

2021 ◽  
Vol 37 (2) ◽  
pp. 44-50
Author(s):  
V. Yu. Dovhal
Keyword(s):  
Rock Pressure ◽  
Coal Mine ◽  
Cross Sectional Area ◽  
Sectional Area ◽  
Coal Seams ◽  
Cross Sectional ◽  
Deep Coal Mine ◽  
The Cross ◽  
The Stability ◽  
Excavation Site

The purpose of the work. Investigation of the manifestations of rock pressure in the retractable road of a steep coal seam to ensure the operational state of production and increase the safety of work at the excavation site of a deep coal mine. The research used a comprehensive approach, including analysis and generalization of theoretical and experimental research on this problem, field experiment to study the stability of retractable drifts and processing of experimental data. To assess the stability of the preparatory workings, mine studies were performed to study the manifestations of rock pressure in the retractable drift under different methods of protection, when the magnitude of the displacement of lateral rocks on the contour and change the cross-sectional area of the drift along the excavation section. As a result of the performed researches the conditions of stability of retractable drifts of steep coal seams at protection by fires from wooden sleepers and bushes from risers are substantiated. It is recorded that in the zone of influence of mining works, the fastening in the retractable road is deformed and has characteristic curves from the roof. At a distance of l > 80 m behind the clearing face, the loss of the cross-sectional area of the excavation was about 50 % with the method of protection by bushes from the risers and 30 % with the use of wooden fires. It is experimentally proved that with the method of protection of precinct preparatory workings by rigid wooden structures in the form of bushes from risers, the change of cross-sectional area of the retractable lane behind the treatment face in the area of impact of treatment works occurs linearly with increasing length of the excavation site. To ensure the stability of retractable drifts in a deep coal mine with a steep occurrence of coal seams, it is advisable to use aimless methods of protection, when to support the side rocks are used pliable structures in the form of fires made of wooden sleepers. The use of this method of protection of the preparatory workings can reduce the likelihood of landslides and increase the safety of mining operations.

scholarly journals Specifics of hydro-loosening of coal seams with account of rocks displacement parameters

2018 ◽  
Vol 60 ◽  
pp. 00025 ◽  
Author(s):  
Vasyl Zberovskyi ◽  
Olena Bubnova ◽  
Kateryna Babii
Keyword(s):  
High Pressure ◽  
Coal Seam ◽  
Rock Pressure ◽  
Strain State ◽  
Injection Pressure ◽  
Coal Seams ◽  
Stress Strain ◽  
Liquid Injection ◽  
Seam Mining ◽  
Parameters Calculation

The analysis of efficiency decline of methods for hydraulic influence on outburst-prone coal seams in the conditions of large depths is represented. The models are considered for parameters calculation of high-pressure liquid injection, based on the hypotheses of the stress-strain state formation of the coal seam; the patterns of rock pressure manifestation as well as calculation discrepancy between the liquid injection pressure and the terms of large depths, are established. It is shown that in the parameters calculation of the high-pressure liquid injection, it is necessary to take the height of the column of rocks which lost their integrity and form the stratification zone in the underworked massif instead of depth Н of the seam mining. It has been established that the efficiency of hydro-loosening depends not only on the injection pressure, but also on the location of borehole filtration part relative to the maximum of abutment zone.

scholarly journals LABORATORY STUDIES OF VIBRATION INFLUENCE ON THE PERMEABILITYOF A COAL CORE CONTAINING A THROUGH CRACK

2020 ◽  
Vol 2 ◽  
pp. 180-186
Author(s):  
Leonid A. Rybalkin ◽  
Sergey V. Serdyukov
Keyword(s):  
Hydraulic Fracturing ◽  
Rock Pressure ◽  
Gas Permeability ◽  
Hydraulic Fractures ◽  
Laboratory Studies ◽  
Coal Seams ◽  
Permeability Changes ◽  
Coal Core ◽  
Seismic Vibrations ◽  
Fractured Coal

The degassing of coal seams unloaded from rock pressure is associated with the requirement to intensify the flow of gas to degassing wells. For this purpose, a hydraulic fracturing operation is performed. The paper considers the features of the integrated intensification of coal seams’ degassing performed by hydraulic fractures in the field of seismic vibrations. The work presents the results of laboratory studies of gas permeability changes in fractured coal containing a through crack under the influence of various geomechanical compression and amplitude frequency of seismic vibrations. The obtained results provide the opportunity to evaluate the possibility of seismic vibration’s implication to intensify the degassing of non-wedged hydraulic fractures in coal mines.

Changes in rock pressure manifestations when working pre-wetted coal seams

1965 ◽  
Vol 1 (5) ◽  
pp. 448-454
Author(s):  
V. I. Murashov ◽  
Ya. G. Shliomovichus
Keyword(s):  
Rock Pressure ◽  
Coal Seams ◽  
Rock Pressure Manifestations

Resource-saving technologies during mining of thin and very thin coal seams

2014 ◽  
Vol 8 (1) ◽  
pp. 55-60
Author(s):  
V Buzylo ◽  
◽  
O Koshka ◽  
S Poimanov ◽  
D Malashkevych ◽  
...  
Keyword(s):  
Coal Seams ◽  
Resource Saving
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