The Control Technology on Continuing Displacement of Tunnel in Coal Seam with High Stress Surrounding Rocks
The measurement data indicates that the main reason for tunnel damage is continuing level displacement with the characteristic of Pie Form. The experiment shows that, compared with uniaxial compressing, the residual stress in triaxiality compressing is greater, this can result that the level support can increase the stress of the surrounding rocks and decrease or stop the level displacement, at same time, control the pie form displacement of the coal. Based on the situation of tunnel displacement, semi-closing support with I bar or support structure with anchor cable are designed, which can control the continuing displacement of tunnel effectively.
Guangfan Li, Yong Huang and Chaohe Chen
M. X. Lu et al., "The Control Technology on Continuing Displacement of Tunnel in Coal Seam with High Stress Surrounding Rocks", Advanced Materials Research, Vols. 250-253, pp. 1552-1555, 2011