Research on the grouting and setting pressure of the automatic hole sealing device in underground coal mine

Authors

LI Chengcheng, China Coal Research Institute, Beijing 100013, China; Xi'an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xi'an 710077, ChinaFollow
WANG Yi, China Coal Research Institute, Beijing 100013, China; Xi'an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xi'an 710077, China
WANG Li, China Coal Research Institute, Beijing 100013, China; Xi'an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xi'an 710077, China
DUAN Huijun, China Coal Research Institute, Beijing 100013, China; Xi'an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xi'an 710077, China

Abstract

Grouting pressure and setting pressure are the main parameters for designing an automatic hole sealing device in coal mine, and they are also the important basis for the design of automatic hole sealing construction. Based on the radial sealing range of the slurry, the paper analyzes the sealing effect under different slurry pressure conditions by means of theoretical calculation and numerical simulation. Combined with the mechanical characteristics of the rubber Mooney-Rivlin model, extrusion seal and other principles, the optimal injection pressure and setting pressure are studied and determined. The results show that the radial sealing range of the slurry at a pressure of 2 to 4 MPa is 2 to 4 m, which can meet the sealing requirements for drilling. When the drilling diameter is 96 to 100 mm, the setting seal pressure of 2.2 to 8.4 MPa can make the device achieve the best setting sealing effect. The results can provide a theoretical basis for the design of the device and provides a theoretical basis for determining the technical parameters of the application of the device.

Keywords

methane drainage, sealing device, grouting pressure, setting pressure

DOI

10.3969/j.issn.1001-1986.2021.02.032

Recommended Citation

LI Chengcheng, WANG Yi, WANG Li, et al. (2021) "Research on the grouting and setting pressure of the automatic hole sealing device in underground coal mine," Coal Geology & Exploration: Vol. 49: Iss. 2, Article 33.
DOI: 10.3969/j.issn.1001-1986.2021.02.032
Available at: https://cge.researchcommons.org/journal/vol49/iss2/33

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