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High deformation control method for longspan tunnel in water-bearing stratum of chlorite quartz schist

A control method and technology of quartz flakes are applied in tunnels, tunnel linings, underground chambers, etc., to achieve the effects of improving the bearing capacity and stability of surrounding rock, ensuring construction efficiency and construction safety, and fast settlement rate.

Inactive Publication Date: 2017-12-08
CHANGAN UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

It can solve the large deformation control problem of tunnel construction in the current chlorite quartz schist water-bearing formation

Method used

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  • High deformation control method for longspan tunnel in water-bearing stratum of chlorite quartz schist
  • High deformation control method for longspan tunnel in water-bearing stratum of chlorite quartz schist

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Embodiment 1

[0037] The present invention provides a large deformation control method for large-span tunnels in chlorite-quartz schist water-bearing formations, based on the three-step annular excavation method for reserving core soil, such as figure 1 As shown, tunnel expansion and support are carried out under advanced support, in which double-layer HK200b steel frames are used at the arch and side walls of the tunnel, and support is carried out in stages, in which the first layer of steel frame is used The corresponding reserved deformation is 50~90cm, and the corresponding reserved deformation is 25~45cm when the second layer of steel frame is constructed. The inverted arch adopts a single-layer HK200b steel frame. Double-layer Φ8 steel mesh, grid spacing 20×20cm, specifically includes the following steps:

[0038] (1) Advance support: use double rows of 3.5m long Φ50 advance grouting small conduits 1 with a circumferential spacing of 40cm, and make 1 ring for every 2 steel frames.

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Abstract

The invention relates to the technical field of tunneling, and specifically relates to a high deformation control method for a longspan tunnel in a water-bearing stratum of chlorite quartz schist. The method adopts a three-step annular excavation core soil reservation method as a basis, excavation expansion and supporting of a tunnel are performed under forepoling, wherein an arch and walls of the tunnel adopt two-layer steel frames and graded supporting is performed, a corresponding reserved deformation amount is 50-90cm when the first layer of steel frame is constructed, and a corresponding reserved deformation amount is 25-45cm when the second layer of steel frame is constructed, and the arch adopts a single-layer steel frame. According to the method provided by the invention, while the requirement on high deformation of the longspan tunnel in the water-bearing stratum of the chlorite quartz schist is met, safety of the supporting structures can also be ensured, the purposes of no invasion and no arch change are achieved, and the current difficulty of controlling high deformation of the longspan tunnel constructed in the water-bearing stratum of the chlorite quartz schist can be solved.

Description

technical field [0001] The invention relates to the technical field of tunnel engineering, in particular to a large deformation control method for large-span tunnels in chlorite quartz schist water-bearing formations. Background technique [0002] Chlorite schist is mixed with a small amount of quartz veins (quartz content is less than 20%), commonly known as chlorite quartz schist. This type of rock mass has low strength, poor rock mass integrity, and is fragmented or scattered. Although it is more stable than pure chlorite schist formations, in water-bearing formations, the chlorite schist components will disintegrate. The rock mass is extremely broken, and the self-stabilization ability of the surrounding rock of the tunnel is extremely poor. Serious large deformations are likely to occur during the construction process. Excavation disturbs the surrounding rock in a large range. If the technical measures are not appropriate, it is easy to cause tunnel support deformation...

Claims

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Application Information

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IPC IPC(8): E21D9/04E21D11/14E21D11/18E21D11/10
CPCE21D9/001E21D9/04E21D11/10E21D11/14E21D11/18
Inventor 陈建勋罗彦斌陈丽俊高贵轩王万平姚铁峰别素平李伟
Owner CHANGAN UNIV
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