Study on reasonable width of coal pillar near the edge of panel based on prevention and control of rock burst

Deep rock burst accidents occur frequently and become increasingly serious. Further improving the effectiveness and accuracy of the prevention and control of rock burst, ensuring the safe and efficient production of mines, clarifying the basic causes of disasters, and refining the type of deep rock burst are the most important key links. Aiming at the problems such as unclear incentives and types and the lack of effective and targeted prevention measures of deep rock burst, taking Xin’an Mine as the research background, based on the energy theory, the coal and rock mass multisource energy unified equation was established to analyze coal and rock mass instability mechanism. According to the different degrees of participation of various factors, the types of deep rock burst are determined as three categories and four types, and the corresponding judgment criteria are proposed. The precise prevention and control system for the source of rock burst with Xin’an characteristics is proposed, successfully applied to the 8101 working face, which not only guarantees the safe production of the working face, but also achieves good economic benefits. The research results lay the foundation for improving the accuracy and precision of the prevention and control of deep rock burst and provide theoretical guidance for the safe and efficient mining of the mine.

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Controlling Mechanism of Rock Burst by CO2 Fracturing Blasting Based on Rock Burst System

Shock and Vibration ◽

10.1155/2020/8876905 ◽

2020 ◽

Vol 2020 ◽

pp. 1-9 ◽

Cited By ~ 1

Author(s):

Tianwei Lan ◽

Chaojun Fan ◽

Jun Han ◽

Hongwei Zhang ◽

Jiawei Sun

Keyword(s):

Coal Mining ◽

Rock Burst ◽

Coal Mine ◽

Prevention And Control ◽

Stress Measurement ◽

Tectonic Stress ◽

Microseismic Monitoring ◽

Time Space ◽

Controlling Mechanism ◽

And Control

Rock burst induced by mining is one of the most serious dynamic disasters in the process of coal mining. The mechanism of a rock burst is similar to that of a natural earthquake. It is difficult to accurately predict the “time, space, and strength” of rock burst, but the possibility of rock burst can be predicted based on the results of microseismic monitoring. In this paper, the rock burst system under the tectonic stress field is established based on the practice of coal mining and the result of mine ground crustal stress measurement. According to the magnitude of microseismic monitoring, the amount of the energy and spatial position of the rock burst are determined. Based on the theory of explosion mechanics, aiming at the prevention and control of rock burst in the coal mine, the technique of liquid CO2 fracturing blasting is put forward. By the experiment of blasting mechanics, the blasting parameters are determined, and the controlling mechanism of rock burst of liquid CO2 fracturing blasting is revealed. The application of liquid CO2 fissure blasting technology in the prevention and control of rock burst in Jixian Coal Mine shows that CO2 fracturing blasting reduces the stress concentration of the rock burst system and transfers energy to the deeper part, and there is no open fire in the blasting. It is a new, safe, and efficient method to prevent and control rock burst, which can be applied widely.

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Prevention and Control Technology Research on Rock Burst of Fully Mechanized Caving Faces and Gob-Side Entry

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.353-356.303 ◽

2013 ◽

Vol 353-356 ◽

pp. 303-306

Author(s):

Zhi Chao Tian ◽

Long Hao Dong ◽

Min Ma ◽

Ye Jiao Liu

Keyword(s):

Rock Burst ◽

Coal Mine ◽

Similar Condition ◽

Economic Benefit ◽

Prevention And Control ◽

Scientific Basis ◽

Surrounding Rock ◽

Control Technology ◽

Technology Research ◽

And Control

According to the actual monitoring data of mining environment and rock burst happening on the 3511 fully-mechanized workface in Anyuan coal mine, the research of the rock burst on the workface and its surrounding rock of gob-side entry is done and the reasonable supporting scheme is determined. The research results are of great guiding importance to the coal mining that has similar condition, provide scientific basis for the control technology of rock burst on the workface and its gob-side entry as well as the reasonable identification of support parameters on the gob-side tunnel, and supply technology protection in order to accelerate the advancing speed of workface. Finally it can produce larger economic benefit.

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Mechanism and Control of Roadway Floor Rock Burst Induced by High Horizontal Stress

Shock and Vibration ◽

10.1155/2021/6745930 ◽

2021 ◽

Vol 2021 ◽

pp. 1-13

Author(s):

Dongming Guo ◽

Xinchao Kang ◽

Zhiying Lu ◽

Qiyu Chen

Keyword(s):

Rock Burst ◽

Prevention And Control ◽

Large Diameter ◽

Horizontal Stress ◽

Steel Tube ◽

Pressure Relief ◽

Floor Rock ◽

Concrete Filled Steel Tube ◽

Rock Burst Risk ◽

And Control

According to the characteristics of rock burst of high horizontal stress roadway floor, the rock burst mechanism of roadway floor was studied with the background of south track roadway Xing’an mine. Based on the deflection theory and energy principle of the slab, the mechanical model of the floor of the roadway under high horizontal stress was established, the stress and energy criteria of rock burst occurred in the floor of the roadway were deduced, the prevention and control measures of the floor pressure relief with large diameter borehole and concrete-filled steel tube pile support were put forward, and the key parameters were determined. By establishing a numerical model, the evolution law of plastic zone, horizontal stress, and elastic strain energy density of roadway floor with or without support is contrastively analyzed. The results show that the effective means to prevent and control the floor rock burst is to cut off the stress transfer path by weakening the hard floor to reduce floor energy accumulation so as to reduce the floor rock burst risk. Based on the above research, field tests were carried out, and the microseismic monitoring results showed that the floor pressure relief of large diameter boreholes and concrete-filled steel tube pile support effectively relieved the floor rock burst and guaranteed the safety and efficiency of roadway excavation. This technology can provide a reference for the prevention and control of floor rock burst of similar roadways.

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Prevention Logic of Rock Burst for Brittle Rock under High Geo-Stress

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.261-263.1484 ◽

2011 ◽

Vol 261-263 ◽

pp. 1484-1488

Author(s):

Guo Qing Chen ◽

Guo Shao Su ◽

Tian Bin Li

Keyword(s):

Rock Burst ◽

Prevention And Control ◽

Hard Rock ◽

Deep Tunnel ◽

Working Face ◽

Numerical Software ◽

Released Energy ◽

Ground Stress ◽

And Control ◽

Good Agreement

Rock burst hazard is the main problem of hard rock deep tunnel under high ground stress conditions. The prevention logic of prevention and control of rock burst is proposed by combining local energy release rate index based on the brittle Hoek-Brown model. Stress releasing holes are adopted to lead some energy to release actively and eliminate burst potential of rock burst. Supporting opportunity and parameters were studied by contrasting the magnitude of released energy in FLAC3D numerical software, and then the prevention logic of rock burst is presented. Stress releasing holes relieve stress concentration of the working face, transfer the stress to the deep and reduce the risk of rock burst near the working face. At last, the prevention and control of rock burst for sinping II Hydropower tunnel was analyzed, the results are in good agreement with the actual situations. The proposed method could benefit other deep tunnel projects which have brittle failure.

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Mechanism of Coal Burst and Prevention Practice in Deep Asymmetric Isolated Coal Pillar: A Case Study from YaoQiao Coal Mine

Shock and Vibration ◽

10.1155/2021/3751146 ◽

2021 ◽

Vol 2021 ◽

pp. 1-19

Author(s):

Chengchun Xue ◽

Anye Cao ◽

Wenhao Guo ◽

Songwei Wang ◽

Yaoqi Liu ◽

...

Keyword(s):

Numerical Simulation ◽

Coal Mine ◽

Prevention And Control ◽

High Stress ◽

Coal Pillar ◽

Support Pressure ◽

Mining District ◽

Coal Pillars ◽

And Control ◽

The Impact

Coal pillar bursts continue to be a severe dynamic hazard. Understanding its mechanism is of paramount importance and crucial in preventing and controlling its occurrence. The extreme roadway deformations from the asymmetric isolated coal pillars in the central mining district of YaoQiao Coal Mine have responded with frequent intense tremors, with risky isolated coal pillar bursts. The theoretical analysis, numerical simulation, and field measurements were done to research the impact of spatial overburden structure and stress distribution characteristics on the isolated coal pillar area, aiming to reveal the mechanism of coal pillar burst leading to the practice of prevention and control in the asymmetric isolated coal pillar area. The study shows that the overburden structure of the asymmetric is an asymmetric “T” structure in the strike-profile, and the stress in the coal pillar is mostly asymmetric “saddle-shaped” distribution, with the peak stress in the east side of the coal pillar, and the coal pillar is a “high stress serrated isolated coal pillar.” Numerical simulation results showed that the support pressure in the isolated coal pillar area on the strike profile was asymmetrically “saddle-shaped” distribution. The peak vertical stress in the coal pillar area continued to rise and gradually shifted to the mining district's deep part. As a result, the response of the roadway sides to the dynamic load disturbance was more pronounced. They developed a coal burst prevention and control program of deep-hole blasting in the roof of asymmetrical isolated coal pillar roof and unloading pressure from coal seam borehole. Monitored data confirmed that the stress concentration was influential in the roadway’s surrounding rock in the asymmetric isolated coal pillar area, circumventing coal pillar burst accidents. The research outcomes reference the prevention and control of coal bursts at isolated working faces of coal pillars under similar conditions.

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Numerical Analysis of Roof Pre-Splitting Roadway Effect in Incline Coal Seam

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.644-650.1899 ◽

2014 ◽

Vol 644-650 ◽

pp. 1899-1902

Author(s):

Hua Jin ◽

Tao Ning ◽

Bo Yin

Keyword(s):

Stress Concentration ◽

Stress Distribution ◽

Coal Seam ◽

Rock Burst ◽

Prevention And Control ◽

New Technology ◽

Simulation Software ◽

Concentration Degree ◽

Roof Strength ◽

And Control

Roof pre-splitting roadway is a new technology in roof induced rock burst prevention and control of incline coal seam. With the purpose of increasing rock burst prevention and control effective, FLAC3D numerical simulation software was used to analyze stress distribution characteristics and roof pre-splitting effect and the layout of the roof pre-splitting roadway parameters. The results showed that the roof pre-splitting roadway changed roof and floor stress distribution, the stress concentration degree is high in the zone of roof and floor around pre-splitting roadway and the two ribs of pre-splitting roadway, which made the roof strength weakened and easy to break, avoiding a large overhang in the process of mining and rock-burst; The roof pre-splitting roadway led to stress concentration in the range of 5 ~ 10 m, roof effective weakening range 12 m, so the distance of two roof pre-splitting roadway should be more than 20m. The research provided the reference basis for rock burst prevention by roof pre-splitting roadway in the incline coal seam group mining.

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