Mechanism and Treatment of Rock Burst on the Deep Working Face Induced by Drainage in Water-Rich Areas
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ORIGINAL PAPER
Mechanism and Treatment of Rock Burst on the Deep Working Face Induced by Drainage in Water-Rich Areas Couxian Shu
. Fuxing Jiang . Bo Wang
. Xidong Du . Jinlin Wen
Received: 18 June 2020 / Accepted: 17 August 2020 Ó Springer Nature Switzerland AG 2020
Abstract Dynamic events, such as rib spalling and coal burst, occurs frequently on the coal walls and crossheadings of deep working faces in water-rich areas. This paper adopts the methods of case analysis, theoretical analysis and numerical analysis to reveal the mechanism of rock burst on deep working faces induced by drainage in water-rich areas and makes the following conclusions: (1) drainage results in the damage of rock stratum and uneven stress distribution with the stress within the damage zone decreased and the stress on the edge of damage zone increased; (2) in the mining process towards water-rich areas, the stress peaks in different positions from lowest to highest are the stress on the edge of water-rich areas, outside water-rich areas and under water-rich areas respectively; (3) drainage brings about stress concentration on the working face. It is likely to suffer from rock burst when the sum of concentrated stress and C. Shu X. Du State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang 330013, Jiangxi, China F. Jiang B. Wang (&) School of Civil and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China e-mail: [email protected] J. Wen China Academy of Safety Science and Technology, Beijing 100012, China
abutment pressure on the working face is larger than the critical value of rock burst occurrence. Rock burst is the most likely to take place during the mining process towards the edge of water-rich areas. On this basis, rock burst prevention measures are proposed, including optimizing the arrangement of drainage holes, slowing the mining speed, releasing large diameter pressure, increasing the initial support force of hydraulic support, selecting reasonable roadway positions and strengthening roadway support. Specifically for B Mine in the Nalinhe mining area, largeenergy microseismic events can be found during the mining process towards the edge of water-rich areas. No large-energy microseismic events are monitored outside and within water-rich areas because of taking prevention measures in advance. In spite of coal burst and rib spalling, rock burst cannot be found, which ensures the face safe mining. Keywords Drainage Physical action of water– rock Chemical action of water–rock Rock burst Phase transition Deep
1 Introduction With the depletion of coal resources in the east and the implementation of the strategy of coal resources transfer to the west, the coal mining in China shows
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Geotech Geol Eng
a trend of gradually depletion of resources in the east and deep development of coal resources in the west. For example, the maximum mining depth in the mining areas borderin
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