Deep-hole water injection technology of strong impact tendency coal seam—a case study in Tangkou coal mine

2018 ◽  
Vol 11 (2) ◽  
Author(s):  
Zhigang Liu ◽  
Anye Cao ◽  
Xiaosheng Guo ◽  
Jinxiu Li
Keyword(s):  
Coal Seam ◽  
Coal Mine ◽  
Water Injection ◽  
Strong Impact ◽  
Deep Hole ◽  
Injection Technology

scholarly journals Cooperative Control Mechanism of Long Flexible Bolts and Blasting Pressure Relief in Hard Roof Roadways of Extra-Thick Coal Seams: A Case Study

2021 ◽  
Vol 11 (9) ◽  
pp. 4125
Author(s):  
Zhe Xiang ◽  
Nong Zhang ◽  
Zhengzheng Xie ◽  
Feng Guo ◽  
Chenghao Zhang
Keyword(s):  
Coal Seam ◽  
Cooperative Control ◽  
Field Tests ◽  
Surrounding Rock ◽  
Deep Hole ◽  
Coal Seams ◽  
Thick Coal Seam ◽  
Structure Damage ◽  
Hard Roof

The higher strength of a hard roof leads to higher coal pressure during coal mining, especially under extra-thick coal seam conditions. This study addresses the hard roof control problem for extra-thick coal seams using the air return roadway 4106 (AR 4106) of the Wenjiapo Coal Mine as a case study. A new surrounding rock control strategy is proposed, which mainly includes 44 m deep-hole pre-splitting blasting for stress releasing and flexible 4-m-long bolt for roof supporting. Based on the new support scheme, field tests were performed. The results show that roadway support failure in traditional scenarios is caused by insufficient bolt length and extensive rotary subsidence of the long cantilever beam of the hard roof. In the new proposed scheme, flexible 4-m-long bolts are shown to effectively restrain the initial expansion deformation of the top coal. The deflection of the rock beam anchored by the roof foundation are improved. Deep-hole pre-splitting blasting effectively reduces the cantilever distance of the “block B” of the voussoir beam structure. The stress environment of the roadway surrounding rock is optimized and anchorage structure damage is inhibited. The results provide insights regarding the safe control of roadway roofs under extra-thick coal seam conditions.

Research and practice on fluctuation water injection technology at low permeability coal seam

2012 ◽  
Vol 50 (4) ◽  
pp. 851-856 ◽  
Author(s):  
Wei-min Cheng ◽  
Wen Nie ◽  
Gang Zhou ◽  
Yanbin Yu ◽  
Youying Ma ◽  
...  
Keyword(s):  
Coal Seam ◽  
Water Injection ◽  
Low Permeability ◽  
Research And Practice ◽  
Injection Technology

Research on Bursting Liability and its Preventive Measures of -906m Deep Coal and Rock in Zhuji Coal Mine

2012 ◽  
Vol 170-173 ◽  
pp. 428-433 ◽  
Author(s):  
Dong Ming Guo ◽  
Hua Jun Xue ◽  
Li Juan Li ◽  
Jun Long Xue ◽  
Gui He Li
Keyword(s):  
Coal Seam ◽  
Coal Mine ◽  
Water Injection ◽  
Elastic Strain Energy ◽  
Hole Drilling ◽  
Energy Index ◽  
Deep Mining ◽  
Hole Drilling Method ◽  
Drilling Method ◽  
The Impact

Rock burst is a common mine dynamic phenomenon in the world, and the research on bursting liability of coal and rock is the foundation of rock burst’s prevention and treatment. This paper has a research on bursting liability of coal and rock of 11-2 coal seam which is the main coal seam of Zhuji coal mine, and through the research and analysis of coal seam burst energy index(bursting energy index, elastic strain energy index, duration of dynamic fracture) and rock seam burst energy index(bending energy index), this paper given that seam and rock in deep mining section of Zhuji coal mine has bursting liability, put forward a series of countermeasures such as the previous water injection, hole-drilling method, blasting distressing to the coal seam with the impact disaster for deep mining in Zhuji coal mine.

scholarly journals Research on the Mining Effect of Floor Strata in Deep Coal Seam Mining: A Case Study of #7 Coal Seam at Chazhuang Coal Mine

2020 ◽  
Vol 570 ◽  
pp. 052013
Author(s):  
Wenquan Zhang ◽  
Xintao Wu ◽  
Jianli Shao ◽  
Yanghui Ren ◽  
Zaiyong Wang
Keyword(s):  
Coal Seam ◽  
Coal Mine ◽  
Seam Mining

Improving the permeability of coal seam with pulsating hydraulic fracturing technique: A case study in Changping coal mine, China

2018 ◽  
Vol 117 ◽  
pp. 565-572 ◽  
Author(s):  
Ni Guanhua ◽  
Xie Hongchao ◽  
Li Zhao ◽  
Zhuansun Lingxun ◽  
Niu Yunyun
Keyword(s):  
Coal Seam ◽  
Hydraulic Fracturing ◽  
Coal Mine

Analysis on Gas Drainage Based on High-Pressure Water Injection

2012 ◽  
Vol 524-527 ◽  
pp. 1147-1152
Author(s):  
Chao Zheng ◽  
Tian Hong Yang ◽  
Qing Lei Yu ◽  
Peng Hai Zhang
Keyword(s):  
High Pressure ◽  
Coal Seam ◽  
Water Injection ◽  
Mine Safety ◽  
Gas Drainage ◽  
Damage Area ◽  
Major Disaster ◽  
Before And After ◽  
Pressure Water ◽  
Injection Technology

Gas outburst has been a major disaster in high gas mine. Flow law of gas in coal seam was studied, and gas drainage measures were proposed were extraordinarily useful for mine safety and rational use of gas. Finite element numerical method was applied to study changing law of gas pressure before and after the high-pressure water injection and damage deformation of coal under high-pressure water based on fluid-solid coupling and gas-solid coupling and damage theory. This research shows that: (1) a damage area was generated in coal seam under high-pressure water injection. Range of the damage area increase rapidly at the start of water injection and gradually slow down with the passage of time, eventually be more stable. (2) The permeability of rock mass of coal under high-pressure water injection. (3) High-pressure water injection had significant effect on gas drainage in a certain area. It provided a theoretical basis for selecting reasonable design programs to product gas by high-pressure water injection technology.

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