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Open AccessArticle

Model Test and Numerical Study on Surrounding Rock Deformation and Overburden Strata Movement Law of Gob-Side Entry Retaining via Roof Cutting

by Daoyong Zhu 1,2, Jiong Wang 1,2,*, Weili Gong 1,2 and Zheng Sun 1,2
1
School of Mechanics and Civil Engineering, China University of Mining & Technology, Beijing 100083, China
2
State Key Laboratory for Geomechanics & Deep Underground Engineering, China University of Mining & Technology, Beijing 100083, China
*
Author to whom correspondence should be addressed.
Minerals 2020, 10(5), 458; https://doi.org/10.3390/min10050458
Received: 13 April 2020 / Revised: 13 May 2020 / Accepted: 14 May 2020 / Published: 19 May 2020
The effects of roof cutting techniques on the movement law of the overlying strata and deformation features of the surrounding rock in gob-side entry retaining mines were studied using 200 working faces of the Dianping coal mine in Shanxi Province. Using a mechanical analysis, a cantilever beam model formed by roof cutting was used to derive a deformation equation. The physical model test based on the field prototype revealed an asymmetrically distributed displacement curve and reduced collapse displacement when the rock stratum was far from the cutting seam. Outside of the roof cutting height, the collapse of the overlying strata gradually reached a symmetric distribution with increasing height. The deformation of the retained roadway was mainly concentrated on the roof, and the maximum deformation was 14 mm near the roof cutting side. A numerical simulation of the original size of the model test proved that the laws of strata movement and surrounding rock deformation were consistent with the physical test results. Finally, field measurements were performed, which verified the rationality of this study. View Full-Text
Keywords: gob-side entry retaining by roof cutting; model test; non-contact monitoring system; strata movement; numerical simulation; mine pressure monitoring gob-side entry retaining by roof cutting; model test; non-contact monitoring system; strata movement; numerical simulation; mine pressure monitoring
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Zhu, D.; Wang, J.; Gong, W.; Sun, Z. Model Test and Numerical Study on Surrounding Rock Deformation and Overburden Strata Movement Law of Gob-Side Entry Retaining via Roof Cutting. Minerals 2020, 10, 458.

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