中国矿山工程

To solve the roof caving of rectangular roadway caused by concentrated stress, a research was carried out based on the haulage roadway at C2316 working face of Anju Coal Mine. By adopting theoretical calculation, numerical simulation and other methods, the reasons for the roadway instability have been found and support measures have been proposed for improvement. The results of the theoretical calculation show that the height of the relaxation zone over the roadway roof is Ls=3m, the width of the relaxation zone on the two sides of the roadway is Le=2.5m, the rock bolts in the original support scheme are not long enough to reach the relaxation zone. Thus, it’s proposed to change the support scheme of the roof from bolt support to anchor cable support, and change the bolt length on the two sides from 1800mm to 3000mm. Site practice shows that the roof-to-floor and side-to-side convergences are 30mm and 28mm respectively, proving the deformation of the roadway surrounding rocks has been effectively controlled and safety production requirement can be met.