Review and interpretation of primary floor failure mechanism at a longwall coal mining face based on numerical analysis

Géotechnique ◽  
2000 ◽  
Vol 50 (5) ◽  
pp. 547-557 ◽  
Author(s):  
B. Indraratna ◽  
J. A. Nemcik ◽  
W. J. Gale
Keyword(s):  
Numerical Analysis ◽  
Failure Mechanism ◽  
Coal Mining ◽  
Floor Failure ◽  
Longwall Coal Mining ◽  
Mining Face

Microseismic Monitoring and Numerical Simulation Research of Floor Failure Depth in Extra-Thick Coal Seam

2014 ◽  
Vol 881-883 ◽  
pp. 1799-1804 ◽  
Author(s):  
Ai Ping Cheng ◽  
Yong Tao Gao ◽  
Chao Liu ◽  
Jin Fei Chai
Keyword(s):  
Numerical Analysis ◽  
Coal Mining ◽  
Microseismic Monitoring ◽  
Floor Rock ◽  
Thick Coal Seam ◽  
Floor Failure ◽  
Mining Disturbance ◽  
Microseismic Events ◽  
Mining Face ◽  
Failure Depth

Based on the condition of fully mechanized caving face in one mine, two methods of microseismic monitoring and numerical analysis were combined to study the evolution characteristics and development law of floor failure depth in extra-thick coal seam. Microseismic monitoring results show that the number of microseismic events partly reflects the influence of mining disturbance in the roof and floor rock mass. The distribution of microseismic events are intensive near the coal mining face, which show the floor rock mass is seriously damaged during the coal mining. The greatest floor failure depth estimated from mine microseismic monitoring is 31 meters. Numerical analysis indicate that the rock stress around the mine stope is redistributed during the coal mining, due to the effect of mining disturbance. The abutment pressure increases in front of the coal mining face and the stress reduces in the mined areas. The concentration and release of the stress makes contribution to the destroy of the floor rock. The maximum floor failure depth is up to 28 meters calculated from numerical simulation. The consistency of microseismic monitoring results and numerical analysis improve that it is effective and reliable to obtain floor failure depth and considerably possible to predict the water inrush using microseismic monitoring technology with its inherent ability to remotely monitor the progressive failure caused by mining. The research results have great popularization and application values for the similar mine.

scholarly journals RISK ANALYSIS OF ROOF FALL AND PREDICTION OF DAMAGED REGIONS AT RETREAT LONGWALL COAL MINING FACE

2020 ◽  
Vol 35 (3) ◽  
pp. 85-95
Author(s):  
Sajjad Aghababaei ◽  
Gholamreza Saeedi ◽  
Hossein Jalalifar
Keyword(s):  
Risk Analysis ◽  
Coal Mining ◽  
Roof Fall ◽  
Longwall Coal Mining ◽  
Mining Face

scholarly journals Failure mechanism and fracture aperture characteristics of hard thick main roof based on voussoir beam structure in longwall coal mining

2019 ◽  
Vol 8 (2) ◽  
pp. 340-352 ◽  
Author(s):  
Chunwang Zhang ◽  
Zhixin Jin ◽  
Xuanmin Song ◽  
Guorui Feng ◽  
Zhu Li ◽  
...  
Keyword(s):  
Failure Mechanism ◽  
Coal Mining ◽  
Main Roof ◽  
Fracture Aperture ◽  
Beam Structure ◽  
Longwall Coal Mining

Prediction of horizontal movement and strain at the surface due to longwall coal mining

2016 ◽  
Vol 84 ◽  
pp. 105-118 ◽  
Author(s):  
James Barbato ◽  
Bruce Hebblewhite ◽  
Rudrajit Mitra ◽  
Ken Mills
Keyword(s):  
Coal Mining ◽  
Horizontal Movement ◽  
Longwall Coal Mining
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