Deformation Failure Mechanism of Tianping Tunnel Driving through Outburst Coal Seam and Research and Application of Its Control Technology
YUAN Guangming
TIAN Weidong
HUANG Wenxiang
Abstract：The coal-seam gas content and pressure in the section of Tianping tunnel where the coal seam was exposed are very high, the ground stress is large and the tunnel support becomes more and more difficult. In order to smoothly and safely drive through the coal seam exposing section and control the stability of the tunnel surrounding rock, analysis was made on the deformation failure characteristics of the tunnel surrounding rock by using FLAC3D program which was computed based on the mixed discrete method, corresponding support measure and scheme were obtained through research, and site implementation and effect monitoring were carried out. The numerical simulation results showed the state of the stress redistribution and change of the tunnel, the high concentration of the stress in the local range of two sides 3 to 5 m away from the roadway wall was the most direct factor leading to roadway instability. The site monitoring results indicated that the maximum deformation of the tunnel surrounding rock was 108 mm after the support scheme was adopted and it was in an allowable range, so the roadway can keep stable for a long time.
Keywords：high stresslarge deformationnumerical simulationsurrounding rock control
Publication Date：2015-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 87-91 )