Vertical Stress and Deformation Characteristics of Roadside Backfilling Body in Gob-Side Entry for Thick Coal Seams with Different Pre-Split Angles

Authors

Yuqi Ren, Taiyuan University of Technology, Shanxi Province Research Center of Green Mining Engineering Technology
Guorui Feng, Taiyuan University of Technology, Shanxi Province Research Center of Green Mining Engineering Technology
Pengfei Wang, Taiyuan University of Technology, Shanxi Province Research Center of Green Mining Engineering Technology
Jun Guo, Taiyuan University of Technology, Shanxi Province Research Center of Green Mining Engineering Technology
Yi Luo, Taiyuan University of Technology, Shanxi Province Research Center of Green Mining Engineering Technology, West Virginia University
Ruipeng Qian, Taiyuan University of Technology, Shanxi Province Research Center of Green Mining Engineering Technology
Qiang Sun, Taiyuan University of Technology, Shanxi Province Research Center of Green Mining Engineering Technology
Songyu Li, Taiyuan University of Technology, Shanxi Province Research Center of Green Mining Engineering Technology
Yonggan Yan, Taiyuan University of Technology, Shanxi Province Research Center of Green Mining Engineering Technology

Author ORCID Identifier

https://orcid.org/0000-0002-1434-511X

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https://orcid.org/0000-0002-2714-1992

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Document Type

Article

Publication Date

2019

College/Unit

Statler College of Engineering and Mining Resources

Department/Program/Center

Mining Engineering

Abstract

Retained gob-side entry (RGE) is a significant improvement for fully-mechanized longwall mining. The environment of surrounding rock directly affects its stability. Roadside backfilling body (RBB), a man-made structure in RGE plays the most important role in successful application of the technology. In the field, however, the vertical deformation of RBB is large during the panel extraction, which leads to malfunction of the RGE. In order to solve the problem, roof pre-split is employed. According to geological conditions as well as the physical modeling of roof behavior and deformation of surrounding rock, the support resistance of RBB is calculated. The environment of surrounding rock, vertical stress and vertical deformation of the RBB in the RGE with different roof pre-split angles are analyzed using FLAC3D software. With the increase of roof pre-split angle, the vertical stresses both in the coal wall and RBB are minimum, and the vertical deformation of RBB also decreases from 110.51 mm to 6.1 mm. Therefore, based on the results of numerical modeling and field observation, roof pre-split angle of 90° is more beneficial to the maintenance of the RGE.

Digital Commons Citation

Ren, Yuqi; Feng, Guorui; Wang, Pengfei; Guo, Jun; Luo, Yi; Qian, Ruipeng; Sun, Qiang; Li, Songyu; and Yan, Yonggan, "Vertical Stress and Deformation Characteristics of Roadside Backfilling Body in Gob-Side Entry for Thick Coal Seams with Different Pre-Split Angles" (2019). Faculty & Staff Scholarship. 2192.
https://researchrepository.wvu.edu/faculty_publications/2192

Source Citation

Ren, Y., Feng, G., Wang, P., Guo, J., Luo, Y., Qian, R., Sun, Q., Li, S., & Yan, Y. (2019). Vertical Stress and Deformation Characteristics of Roadside Backfilling Body in Gob-Side Entry for Thick Coal Seams with Different Pre-Split Angles. Energies, 12(7), 1316. https://doi.org/10.3390/en12071316

Comments

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