Reasonable Width of Narrow Coal Pillar of Gob-side Entry Driving in Large Mining Height

The gob-side roadway of 130205, a large-mining-height working face in the Yangchangwan coal mine, was investigated in terms of the mine pressure law and support technology for large mining heights and narrow coal pillars for mining roadways. The research included field investigations, theoretical analysis, numerical simulation, field tests, and other methods. This paper analyzes the form of movement for overlying rock structure in a gob-side entry with a large mining height and summarizes the stress state and deformation failure characteristics of the surrounding rock. The failure mechanism of the surrounding rock of the gob-side roadway and controllable engineering factors causing deformation were analyzed. FLAC3D numerical simulation software was used to explore the influence law of coal pillar width, working face mining height, and mining intensity on the stability of the surrounding rock of the gob-side roadway. Ensuring the integrity of the coal pillar, improving the coordination of the system, and using asymmetric support structures as the core support concept are proposed. A reasonably designed support scheme for the gob-side roadway of the working face for 130205 was conducted, and a desirable engineering effect was obtained through field practice verification.

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Dynamic Evolution Law and Width Determination of Section Coal Pillars in Deep Mining Height Working Face

10.21203/rs.3.rs-442910/v1 ◽

2021 ◽

Author(s):

Lei Zhaoyuan ◽

Cui Feng ◽

Liu Jianwei ◽

Lai Xingping ◽

Yi Ruiqiang

Keyword(s):

Dynamic Instability ◽

Coal Pillar ◽

Field Measurements ◽

Deep Mining ◽

Evolution Law ◽

Working Face ◽

Large Mining Height ◽

Coal Pillars ◽

Lower Corner ◽

Mining Height

Abstract The coal column undergoes three types of force evolution from the formation to the end of mining. This paper takes large mining height working face at No.2 Coal Mine as example to study the ways to avoid dynamic instability of the coal column triggered by the deep mining. By means of geological survey, theoretical analysis, numerical calculation and field verification, the load processes under the three stress stage are proposed, and the evolution law of the coal column is analyzed. The study shows that the depth, large mining height working face, coal pillar force and size altogether determine the damage characteristics of the coal pillar. With the combination of Flac3D and 3DEC, it can be analyzed that the plastic failure and displacement characteristics of the 35m coal column under the action of secondary dynamic load coincide. The perturbation stress distribution is stable, which finally determines the reasonable width of the 35m coal column. Field measurements show that the top and gang of the 35m coal column undergo three kinds of displacement characteristics. The lower part is more stable. The top plate of the upper and lower corner completely collapsed in the emptying area, which can play a good supporting role.

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Study on Rational Width of Entry Protection Coal-Pillar in Large Mining Height Working Face

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.413.404 ◽

2011 ◽

Vol 413 ◽

pp. 404-409

Author(s):

Xu Feng Wang ◽

Dong Sheng Zhang ◽

Ting Feng Cui ◽

Jin Liang Wang ◽

Wei Zhang

Keyword(s):

Numerical Simulation ◽

Theoretical Calculation ◽

Coal Pillar ◽

Engineering Practice ◽

Pillar Width ◽

Pillar Design ◽

Working Face ◽

Large Mining Height ◽

Mining Height

This paper demonstrates the attempt to identify a reasonable chain pillar width in the condition of large mining height, along with a case study at the gateway of No.1103 panel with large mining height in Suancigou Mine. Theoretical calculation and numerical simulation were employed as the main approaches during the research to figure out the rational width of entry protection coal-pillar, which was then proved to be capable for engineering practice. The results that derived from our research can offer technical support for spot production, and serve as references for future investigation upon chain pillar design under large mining height.

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Research on Surrounding Rock Control Technology in Two Hard Fully Mechanized Coal Mining

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.868.343 ◽

2013 ◽

Vol 868 ◽

pp. 343-346

Author(s):

Hong Chun Xia ◽

Ru Nan Zhang ◽

Wei Li

Keyword(s):

Coal Pillar ◽

Surrounding Rock ◽

Efficient Production ◽

Security Measures ◽

Safety Requirements ◽

Well Production ◽

Production Safety ◽

Large Mining Height ◽

Surrounding Rock Control ◽

Mining Height

The coal 8210 big mining height of the Datong mine Jin hua gong face in the process of mining airport coal pillar fried state a, floor deformation intense, serious kick drum, eventually leading to rock failure .In the severe cases, easily induced by shock pressure and other disasters ,these have serious impact on the efficient production of face security in the large mining height. by the airport side of roadway roof pressure relief, combined with roadway bolting reinforcement technology effectively control the deformation of surrounding rock of roadway, Test results show that the security measures taken can meet the well production safety requirements.

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Research on Rational Width of Entry Protection Coal-Pillar in Large Mining Height Work-Face of Shallow Coal Seam

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1010-1012.1461 ◽

2014 ◽

Vol 1010-1012 ◽

pp. 1461-1466

Author(s):

Xin Bin Xu ◽

Bang Jun Wang ◽

Ting Feng Cui

Keyword(s):

Numerical Simulation ◽

Coal Seam ◽

Theoretical Calculation ◽

Coal Pillar ◽

Engineering Practice ◽

Large Mining Height ◽

Shallow Coal Seam ◽

Mining Face ◽

Mining Height

For the study on the problem of rational width of entry protection coal-pillar, according to the gateway of 5103 mining face in Heshan Mine, through theoretical calculation and numerical simulation, rational width of entry protection coal-pillar was educed, which was 25 m. The roof and floor and 2-sides deformation were both 35 mm through engineering practice, and its feasibility was demonstrated, which provided some theoretical references for preserving reasonable coal-pillar for the similar coalface with large mining height.

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