Selecting appropriate rock bolt types and installation techniques depends on several key factors related to the rock mass characteristics, the tunnel's design, and the desired level of support. Rock type and strength are paramount. Stronger, more competent rock may require fewer or less robust rock bolts, while weaker, fractured rock will need more extensive support. The uniaxial compressive strength (UCS) and tensile strength of the rock are key parameters. Joint orientation, spacing, and condition also influence rock bolt selection. Closely spaced j....
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