Abstract
To evaluate the reinforcement effectiveness of the grouted rock bolts, a dimensionless parameter’s approach (i.e. bolt density β) is adopted. Following the Mohr–Coulomb and generalized Hoek–Brown f...
Highlights
Grouted rock bolts have been widely used in all civil engineering fields because of its simple structure, convenient construction, remarkable reinforcement effectiveness, low cost, and engineering adaptability, especially in cracked and softening rock masses
The shear stress is characterized by the division of grouted rock bolts are installed with ST spacing around the circumference and with SL spacing along the longitudinal axis of the tunnel as the rock bolts, a pick-up length and an anchor length, on either side of the neutral point
Incorporating the strain-softening characteristic of the surrounding rock and the neutral point of the grouted rock bolts, the equivalent plastic zone is divided into three categories
Summary
Grouted rock bolts have been widely used in all civil engineering fields because of its simple structure, convenient construction, remarkable reinforcement effectiveness, low cost, and engineering adaptability, especially in cracked and softening rock masses. Ranjbarnia et al.[9] proposed an analytical solution to determine the stress and displacement of a tunnel that was excavated in a brittle and strainsoftening rock mass and reinforced with active grouted rock bolts. This solution is based on the nonlinear peak strength criterion. Osgoui and Oreste[10] developed an elastic–plastic analytical solution of an axisymmetrical problem for a circular tunnel reinforced by the grouted rock bolts This improved model was based on the approach of Indraratna and Kaiser,[5] and the nonlinear Hoek–Brown (H–B) failure criterion was adopted. The relationship between the shear stress and the axial stress is presented by dtz dz d2sz dz[2]
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