A classification method of tunnel rockburst prevention using npr materials
A rockburst and tunnel technology, which is applied in the field of tunnel rockburst classification prevention and control, can solve the problems of unrealized energy, slow release, accumulation, etc., and achieve the effects of reducing the probability of rockburst occurrence, improving the yielding deformation capacity, and preventing the induced rockburst
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[0044] (1) Determine the intensity level of rock burst;
[0045] Step 1: Use the hydraulic fracturing method to measure the in-situ stress state of the proposed tunnel, mainly including the maximum horizontal stress (S H ), the minimum horizontal stress (S h ) and vertical stress (S v ) and the direction of maximum principal stress and the dominant direction. Step 2: Determine the angle between the direction of the maximum horizontal principal stress near the borehole and the direction of the tunnel axis, and calculate the angle α between the direction of the maximum horizontal principal stress and the direction of the normal stress on the sidewall of the tunnel in the tunnel cross-section. Step 3: Calculate the stress acting on the sidewall of the tunnel according to the elastic mechanics formula. The specific formula is as follows:
[0046]
[0047]
[0048] σ θ =3σ h -σ H
[0049] where: σ H is the axial stress of the tunnel, Mpa; σ θ is the maximum tangentia...
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