A discussion on analytical and numerical modelling of the land subsidence induced by coal seam gas extraction

2018 ◽  
Vol 77 (9) ◽  
Author(s):  
Guojun Wu ◽  
Shanpo Jia ◽  
Bailin Wu ◽  
Diansen Yang
Keyword(s):  
Numerical Modelling ◽  
Coal Seam ◽  
Land Subsidence ◽  
Gas Extraction ◽  
Coal Seam Gas

Experimental Study on Deep Borehole Pre-Cracking Blasting of Drilling through Strata at Low Permeability Seam

2013 ◽  
Vol 868 ◽  
pp. 339-342
Author(s):  
Jian Liu ◽  
Qian Le
Keyword(s):  
Coal Seam ◽  
Control Area ◽  
Low Permeability ◽  
Gas Extraction ◽  
Test Results ◽  
Deep Borehole ◽  
Coal Seam Gas ◽  
Gas Concentration ◽  
Working Face ◽  
Outburst Coal Seam

In the process of roadway excavation in the low permeability outburst coal seam, with drilling through strata in the bottom drainage roadway extracting coal seam gas of control area. In order to improve extraction effect, the method that deep borehole pre-cracking blasting is used to increase the permeability of coal in the drilling through strata seam segment is proposed. The calculation formula on crushing circle and crack circle radius of deep borehole pre-cracking blasting are derived, and the effective loosening radius of blasting is calculated in theory, the research achievements are applied to field test, the test results show that deep borehole pre-cracking blasting permeability improvement technology is carried out in the drilling through strata of the low permeability outburst coal seam, the permeability of coal seam is improved by 180 times, the gas extraction scalar is raised by 8-10 tomes, during the process of roadway excavation, gas concentration of the working face is 0.2%-0.3%, and tunneling footage is increased by 2 times.

scholarly journals Stress Distribution and Gas Concentration Evolution during Protective Coal Seam Mining

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Xingang Niu ◽  
Biming Shi ◽  
Zhigang Zhang ◽  
Yongjiang Zhang
Keyword(s):  
Numerical Modelling ◽  
Coal Seam ◽  
Mining Method ◽  
Coal Seam Gas ◽  
Gas Concentration ◽  
Induced Stress ◽  
Complete Extraction ◽  
Stress Zone ◽  
Seam Mining ◽  
Concentration Evolution

Coal and gas burst is one of the significant and catastrophic hazards in underground longwall operations. To date, the protective coal seam mining has been recognized as the most effective mining method for minimizing or even avoiding the effect of the coal and gas burst. In this paper, numerical modelling and field test were carried out for the longwall operation in Qidong Coal Mine in order to investigate the induced stress and coal seam gas drainage performance in the protected coal seam after the complete extraction of the protective coal seam. It was found that four stress zones can be classified in the protected coal seam being the original stress zone, stress concentration zone, stress relief zone, and recompaction zone. In addition, the monitoring data of gas concentration and volume change in the field agree well with the numerical modelling results.

Fracked: Coal seam gas extraction and farmers’ mental health

2016 ◽  
Vol 47 ◽  
pp. 22-32 ◽  
Author(s):  
Methuen I. Morgan ◽  
Donald W. Hine ◽  
Navjot Bhullar ◽  
Debra A. Dunstan ◽  
Warren Bartik
Keyword(s):  
Mental Health ◽  
Coal Seam ◽  
Gas Extraction ◽  
Coal Seam Gas

Modelling the cumulative impacts of future coal mining and coal seam gas extraction on river flows: applications of methodology

2021 ◽  
pp. 126440
Author(s):  
Neil R. Viney ◽  
David A. Post ◽  
Yongqiang Zhang ◽  
Fazlul Karim ◽  
Santosh K. Aryal ◽  
...  
Keyword(s):  
Coal Seam ◽  
Coal Mining ◽  
Gas Extraction ◽  
Cumulative Impacts ◽  
Coal Seam Gas ◽  
River Flows
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