- The advanced small conduit is a technological method in the excavation construction process of tunnel engineering. It is mainly used in weak fracture zones, shallow buried sections, tunnel bias sections, sand layers, sand and pebble sections, fault fracture zones and other sections with short self-stabilization time. of pre-support.
- The advanced small conduit is a very effective auxiliary construction method to stabilize the excavation working surface. In the construction of weak and broken rock strata, the small advance conduit plays a role in reinforcing the loose rock stratum. After grouting, the stability of the loose and weak surrounding rock is enhanced, which is beneficial to the stability of the surrounding rock after the completion of excavation and the completion of initial support. , which will prevent the surrounding rock from becoming unstable and damaging until collapse.
Advance small tube grouting is suitable for weak surrounding rock in the tunnel arch, loose, unbonded soil layers, sand layers with poor self-stabilizing ability, and gravel (pebble) level broken rock layers. - Grouting through advanced small conduits can change the condition and stability of the surrounding rock. After the slurry is injected into weak, loose strata or cracks in the water-bearing broken surrounding rock, it can come into close contact with and solidify. The slurry replaces the water and air between soil particles and rock cracks by filling, splitting, etc., and then occupies its position. After a certain period of time, it condenses and cements the original loose soil particles or cracks into a whole to form a new structure. , a consolidated body with high strength and good waterproof performance, which greatly improves the loose and broken condition of the surrounding rock.
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