Reasons and Control Countermeasures of Special Soft Coal Roadway Deformation in Liangbei Coal Mine

Abstract:

B1 coal seam located at -550m level in Liangbei Coal Mine is a typical "three-soft" seam. The coal roadway with a depth of 610-750m lies under the critical softening depth of the roadway, and its support difficulty coefficient is 1.5-2.0. The coal has poor air permeability, high gas content and high gas pressure, so danger degree of the gas outburst is relatively strong. The coal seam was destroyed in a disastrous state by more than 100 boreholes for gas outburst prevention during the excavation. This results in the difficulty in the roadway support. Engineering geological characteristics of the coal roadway at 11 mining area are introduced. Based on the engineering geo-mechanics method, the reasons of deformation and failure of the coal roadway are analyzed. In view of problems in excavation and support, as well as the type of the coal roadway deformation mechanism, the borehole parameters are optimized for the gas outburst prevention, and bolt-net-cable coupling support with high convex steel-belt is used to control the coal roadway stability at 11 mining area. Practice shows that the effect is fine.

• Periodical: Advanced Materials Research (Volumes 671-674)
• Pages: 1144-1149
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.671-674.1144
• Online since: March 2013
• Authors: Le Tuan Cheng, Jia Lin Zhang, Zheng Sheng Zou, Qing Bo Li
• Keywords: Bolt-Net-Cable Coupling Support, Deformation Mechanism, Engineering Geological Characteristics, Gas Drainage Borehole, High Convex Steel-Belt, Three-Soft Coal Roadway

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