Original scientific paper

https://doi.org/10.17559/TV-20170904131528

Influence Mechanism of Main Roof Height on Surrounding Rock Stability of Gob-Side Entry Driving

Hai-qing Shuang orcid.org/0000-0001-6284-7803 ; College of Safety Science and Engineering, Xi’an University of Science and Technology, Xi’an 710054, P. R.China / Room 1501, College of Mechanical and Electrical Engineering, China University of Mining & Technology, No. 58 Yan Ta Road , Xi’an, 710054, Sha
Shu-gang Li ; College of Safety Science and Engineering, Xi’an University of Science and Technology, Xi’an 710054, P. R.China / Room 1501, College of Mechanical and Electrical Engineering, China University of Mining & Technology, No.58 Yan Ta Road , Xi’an, 710054, Shaa
Gao-feng Chen ; College of Safety Science and Engineering, Xi’an University of Science and Technology, Xi’an 710054, P. R.China / Room 1501, College of Mechanical and Electrical Engineering, China University of Mining & Technology, No. 58 Yan Ta Road , Xi’an, 710054, Sha
Peng Xiao ; College of Safety Science and Engineering, Xi’an University of Science and Technology, Xi’an 710054, P. R.China / Room 1501, College of Mechanical and Electrical Engineering, China University of Mining & Technology, No. 58 Yan Ta Road , Xi’an, 710054, Sha
Liang-chang Shen ; College of Energy Engineering, Xi’an University of Science and Technology, Xi’an 710054, P. R. China / Room 9605, College of Energy Engineering, China University of Mining & Technology, No. 58 Yan Ta Road , Xi’an, 710054, Shaanxi Province, P. R. China
Ki-il Song ; Department of Civil Engineering, Inha University, 100 Inha-ro, Nam-gu, Incheon 402-751, Republic of Korea

Abstract

The main roof directly affects the stress environment and the control effect of the surrounding rock of gob-side entry driving. A mechanical model of the surrounding rock of gob-side entry driving was established to analyze the influence mechanism of different main roof heights on the surrounding rock stability of the roadway under similar geological conditions. In addition, the influences of the main roof heights on the stress distribution of the surrounding rock were qualitatively analyzed. A quantitative analysis of the stress and deformation distribution characteristics of the surrounding rock were conducted by Universal Distinct Element Code (UDEC) when the heights were 0, 5, and 10 m based on the actual geological conditions. Results show that waste rocks in the caving zone and damaged immediate roof could provide four different stress combinations to key rock block, which is affected by the main roof height and other related parameters. With the increase in the main roof height, the hinged stress between the key rock blocks and the plastic damage area of the physical coal wall are reduced, the damage range of immediate roof gradually increases, and the vertical stress of narrow coal pillars first increases to 5.22 MPa and then remains at approximately 1.92 MPa. Therefore, the supporting strength of roof and the physical coal wall should be enhanced. Research results are successfully applied in the Yanjiahe Coal Mine. The conclusions provide significant theoretical guidance for controlling surrounding rock stability of the roadway under similar conditions.

Keywords

gob-side entry driving; main roof height; numerical simulation; surrounding rock stability

Hrčak ID:

199148

URI

https://hrcak.srce.hr/199148

Publication date:

21.4.2018.

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