A Construction Method Combining Full-Section Fiberglass Anchor and Core Soil Reinforcement

Abstract

The invention discloses a construction method combining full-section glass fiber anchor rods and core soil reinforcement. The tunnel face is divided into an arc-shaped ring surface area and a core soil area, and the core soil area is reserved to constrain the soil in front of the tunnel face. Extrusion deformation; then divide the arc-shaped annulus area and the core soil area, and set glass fiber anchors with different spacing according to the division, thereby reducing the number of glass fiber anchors, reducing the amount of work for workers, and reducing the construction period. Effectively reduce the construction cost.

Description

technical field [0001] The invention belongs to the technical field of tunnel construction, and in particular relates to a construction method combining full-section glass fiber bolts and core soil reinforcement. Background technique [0002] At present, in the construction process of domestic tunnels and subways, many construction lines with short self-stabilization time are weak and broken zones, shallow buried sections, hollow bias sections, sand sections, sand pebble sections, and fault fracture zones. The stability ability is relatively weak or even has no self-stabilization ability, which may cause the situation that the excavation face cannot be self-stabilized or the ground subsidence is too large during excavation; Self-stabilizing ability to ensure the progress of excavation and follow-up operations. Construction auxiliary measures must be used to pre-support or pre-reinforce the face formation. [0003] In recent years, with the massive construction of undergrou...

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Problems solved by technology

[0003] In recent years, with the massive construction of underground projects, the degree of mechanized construction has been continuously improved, and new technologies and new processes have been adopted by many domestic projects one after another; glass fiber anchor grouting is the mainstay of the newly introduced tunnel "Xinyi method" construction method in China. The supporting technology has been widely concerned by the tunnel engineering community. The main component of glass fiber anchor is glass fiber reinforced polymer. The performance of the material depends on the type of fiber and polymer and the cross-sectional shape, so the performance of glass fiber material is flexible. Its changeable characteristics can meet the special requirements of different projects; but at present, because the "new method" adopts the method of uniformly setting glass fiber anchor rods on the entire face of the tunnel, and then carrying out full-section excavation, due to the use of full-section excavation, In places where the geology is more complex, due to the different strength of the soil, the soil in front of the face may be extruded and deformed; and the construction will result in a large number of glass fiber anchors that need to be grouted, thereby increasing the workload of the workers , such a construction method will greatly increase the construction period, thereby increasing the construction cost

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