Tunnel extremely soft rock stratum shrinkage arch frame primary supporting method
An arch and rock formation technology is applied in the field of the initial support of the shrinkage arch frame in the extremely soft rock formation of the tunnel, which can solve the problems of affecting the construction progress, increasing the construction cost, and reducing the amount of reserved settlement and deformation, so as to avoid safety accidents, speed up the construction progress, The effect of avoiding intrusive rework
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[0037] Aiming at some existing problems such as partial strand-like groundwater outflow from the face, surrounding rocks softened by water, poor self-stabilization ability of the surrounding rocks, local slipping and block falling during the excavation process, the existing construction method adopts three Step method + temporary inverted arch, the excavation reserved deformation of 300mm. Such as figure 2 with 3 As shown, the composite lining structure of Va is designed, and the arch frame + the primary support structure of the advanced small conduit is adopted, and the arch foot is reinforced by the φ42 locking foot anchor pipe 2. details as follows:
[0038] ① Advance support adopts small conduits 12 of φ42mm, 4.0m in length, 3.6m in longitudinal spacing, 50 in each ring, and 0.4m in circumferential spacing;
[0039] ② The primary support adopts shotcrete, steel mesh, anchor rod, and I22b steel, among which:
[0040] Shotcrete: C25 concrete, arch thickness 28cm, invert...
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