Deformation-Failure Characteristics and Control Strategy of Mining Roadway Roof in Argillaceous Rock
Authors
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Institute of Mining Engineering, InnerMongolia University of Science and Technology, Baotou 014010, Inner Mongolia and Li Jianhua ,CN
He Yanjun -
Shenhua Baotou Energy Co.,Ltd, Erdos 017000, Inner Mongolia ,CNLi Jianhua
Keywords:
Argillaceous rock; mining roadway; large deformation; long-extension bolt.Abstract
Aimed at the large amount of mining roadway roof subsidence in argillaceous rock, as well as frequently happened roof caving accidents, the mining roadway from Baode coal mine was taken as the research background. By the integrated use of field measurement, numerical simulation, and the theoretical analysis, the deformationfailure characteristics and engineering controllability of mining roadway roof in argillaceous rock was studied. The results indicate that: During the mining influence. This kind of roadway suffers serious roof deformation and failure and has little to do with the increase of the support strength. The roof subsidence is far out of the endurance of the anchor cable. The roof breakage depth is around 4.0m. With the existing technology, it is not available to limit the roof subsidence by high-strength bolting, and it is a must to adopt the supporting method with good extension property, which gives priority to roof caving control. Accordingly, the control strategy which gives priority to long-extension bolt appeared. The engineering testing results indicate that this technology can coordinate with the roof deformation, thus effectively prevent the roof caving.
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