Gas Control Technology under Unstable Disturbance Stress

Abstract:

Under the action of unstable disturbance stress, the stress concentration and roadway deformation are serious when tunneling along the goaf with small pillar while the adjacent working face is mining. This leads to the abnormal gas discharge and the increase of gas emission, and the effectiveness of gas drainage is reduced. In order to eliminate the threat of gas, the dynamic gas control technology of tunneling along the goaf with small pillar under unstable disturbance stress has been researched. The main sources of loads are confirmed by the analysis of dynamic and static loads. Combined with the force analysis of roadway and pillar, the stress superposition level is affected by the relative location of heading face and working face, and the regional characteristics. The measured surrounding rock deformation of A4007 return roadway heading face fits the theoretical analysis and pressure step of working face. The dynamic gas control technology is researched from the aspects of air volume, high-level gas drainage and goaf drainage, and applied in A4007 working face. The gas has been well controlled with the gas concentration of top corner of 0.62% and gas concentration of return current of 0.35%. As a result of the flow control, the gas drainage has not casused spontaneous combustion.

• Periodical: International Journal of Engineering Research in Africa (Volume 15)
• Pages: 26-34
• DOI: https://doi.org/10.4028/www.scientific.net/JERA.15.26
• Online since: April 2015
• Authors: Wei Min Cheng, Lu Lu Sun*, Gang Wang, Hong Yuan Qu
• Keywords: Dynamic Gas Control, Small Coal Pillar, Stress Concentration, Tunnel along the Goaf, Unstable Disturbance Stress

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