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| Research and application of drilling pressure relief support technology in deep rock roadway |
| Du Longlong1,2 |
| 1. Hebei Coal Research Institute Co., Ltd., Xingtai 054000, China; 2. Hebei Mine Microseism Key Laboratory,Xingtai 054000, China |
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Abstract The track roadway of No.11 mining area in Dongpang Mine is located on the floor of No. 2 coal seam. There was severe deformation and had undergone multiple renovations, resulting in high maintenance costs. To control tunnel deformation, research on deep rock roadway support technology was carried out. On site investigation showed that the deformation of the track roadway in the 11th mining area was severe, and the support bodies such as anchor rods and cables were severely damaged. Mechanical parameter testing was conducted on the sandstone in the tunnel, and its uniaxial compressive strength was 23.7 MPa. The main reasons for the large deformation of the roadway were the low strength of the surrounding rock, the extraction of the No.2 coal working face, and the unreasonable support parameters. Analysis showed that after drilling in the coal rock mass of the tunnel, it could promote the transfer of stress concentration to the deep, while providing a certain buffer for tunnel deformation, which was conducive to the stability of the surrounding rock. Therefore, it was determined to adopt a joint control scheme of strong anchor cables, pressure relief drilling, and secondary grouting. The observation of mine pressure showed that after adopting this plan for repair, the track roadway underwent severe deformation during a certain period of time, with small deformation values, which provided reference for roadway support under similar conditions.
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