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

Yuqi Ren, Guorui Feng, Pengfei Wang, Jun Guo, Yi Luo, Ruipeng Qian, Qiang Sun, Songyu Li and Yonggan Yan
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Yuqi Ren: College of Mining Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Guorui Feng: College of Mining Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Pengfei Wang: College of Mining Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Jun Guo: College of Mining Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Yi Luo: College of Mining Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Ruipeng Qian: College of Mining Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Qiang Sun: College of Mining Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Songyu Li: College of Mining Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Yonggan Yan: College of Mining Engineering, Taiyuan University of Technology, Taiyuan 030024, China

Energies, 2019, vol. 12, issue 7, 1-16

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 FLAC 3D 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.

Keywords: longwall mining; gob-side entry; roadside backfilling body; stress; deformation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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