Open Access
ARTICLE
Stability Control of Gob-Side Entry Retaining in Fully Mechanized Caving Face Based on a Compatible Deformation Model
Xinshuai Shi1, Hongwen Jing1, *, Jianguo Ning2, Zhenlong Zhao1, Junfu Zhu1
1 State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and
Technology, Xuzhou, 221116, China.
2 College of Mining and Safety Engineering, Shandong University of Science and Technology, Qingdao,
266510, China.
* Corresponding Author: Hongwen Jing. Email: .
(This article belongs to this Special Issue: Modeling and Simulation of Fluid flows in Fractured Porous Media: Current Trends and Prospects)
Computer Modeling in Engineering & Sciences 2020, 124(1), 315-343. https://doi.org/10.32604/cmes.2020.07955
Received 15 July 2019; Accepted 10 March 2020; Issue published 19 June 2020
Abstract
The stability control of gob-side entry retaining in fully mechanized caving face
is a typical challenge in many coal mines in China. The rotation and subsidence of the
lateral cantilever play a critical role in a coal mine, possibly leading to instability in a coal
seam wall or a gob-side wall due to its excessive rotation subsidence. Hence, the presplitting
blasting measures in the roof was implemented to cut down the lower main roof and convert
it to caved immediate roof strata, which can significantly reduce the rotation space for the
lateral cantilever and effectively control its rotation. Firstly, the compatible deformation
model was established to investigate the quantitative relationship between the deformation
of the coal seam wall and the gob-side wall and the subsidence of the lateral cantilever. Then,
the instability judgments for the coal seam wall and gob-side wall were revealed, and the
determination method for the optimal roof cutting height were obtained. Furthermore, The
Universal Distinct Element Code numerical simulation was adopted to investigate the effect
of roof-cutting height on the stability of the retained entry. The numerical simulation results
indicated that the deformation of the roadway could be effectively controlled when the roofcutting height reached to 18 m, which verified the theoretical deduction well. Finally, a field
application was performed at the No. 3307 haulage gateway in the Tangan coal mine, Ltd.,
Shanxi Province, China. The field monitoring results showed that the blasting roof cutting
method could effectively control the large deformation of surrounding rocks, which provided
helpful references for coal mine safety production under similar conditions.
Keywords
Cite This Article
Shi, X., Jing, H., Ning, J., Zhao, Z., Zhu, J. (2020). Stability Control of Gob-Side Entry Retaining in Fully Mechanized Caving Face Based on a Compatible Deformation Model.
CMES-Computer Modeling in Engineering & Sciences, 124(1), 315–343.
Citations