| 摘要 |
A rock bolt assembly comprising a rock bolt having an elongate shaft extending between opposite distal and proximal ends of the rock bolt, and a sheath disposed on the shaft at or adjacent the distal end of the bolt, the sheath having a body that extends about the shaft, the body having a longitudinal axis, opposite leading end and trailing end spaced apart along the axis, the body incorporating a cavity in which the shaft is disposed, the cavity extending from the trailing end of the body.
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