Single-line railway tunnel anti-rock-burst support method corresponding to different rock burst intensity levels
A single-track railway, rockburst technology, applied in tunnels, tunnel lining, earthwork drilling, etc., can solve the problem of lack of rockburst-proof support structure system, and achieve the effect of ensuring stability and safety, and strong practical operability
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[0023] Example 1
[0024] The explosion intensity level is judged according to existing methods such as advanced geological prediction, microseismic monitoring, and site characteristics:
[0025] The specific support steps for the minor rockburst section are as follows. The cyclical footage of the tunnel excavation is controlled to 3m. After the blasting, danger discharge and slag discharge of the tunnel every cyclical excavation, ① spray high-pressure water on the face and wall of the tunnel to soften the surface to release the enclosure. Rock stress. ② After the rockburst state has basically subsided, C25 concrete shall be sprayed to the excavation surface to play the role of initial support. ③The arch wall is equipped with 2m long Φ22 mortar anchors with a spacing of 2m×2m (ring × vertical), and a φ6 steel mesh is hung with a grid spacing of 25×25cm. ④ Re-spray C25 concrete to the design thickness.
[0026] The specific support steps for the medium rock burst section are as fol...
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