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Large deformation control method of chlorite quartz schist stratum large-span tunnel

A control method and quartz sheet technology, 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

Active Publication Date: 2018-02-23
CHANGAN UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the above technical problems, the present invention provides a large deformation control method for large-span tunnels in chlorite-quartz schist formations, which does not invade the limit and does not change arches, and can solve the problem of chlorite-quartz schist formation in view of the characteristics of chlorite-quartz schist formations. Large deformation control problem of long-span tunnel in schist formation

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  • Large deformation control method of chlorite quartz schist stratum large-span tunnel

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Embodiment 1

[0037] The method for controlling large deformation of a large-span tunnel in a chlorite-quartz schist stratum provided by the present invention is 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 advance support, in which double-layer HW175 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 frames is used The corresponding reserved deformation amount is 30~50cm, and the corresponding reserved deformation amount is 15~25cm when the second layer of steel frame is constructed. 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.

[0039] (2) Construction of the steel frame on t...

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Abstract

The invention relates to the field of tunnel engineering, in particular to a large deformation control method of a chlorite quartz schist stratum large-span tunnel. The method comprises the steps of conducting tunnel expanding excavation and supporting under forepoling based on a three-step annular excavation reserve core soil method, wherein double-layer steel frames are adopted to the arches andside walls of the tunnel, and fractional supporting is conducted; during fractional supporting, the corresponding reserved deformation is 30-50 cm when a first layer of the steel frame is established, the corresponding reserved deformation is 15-25 cm when a second layer of the steel frame is established, and a single-layer steel frame is adopted at inverted arches. According to the large deformation control method of the chlorite quartz schist stratum large-span tunnel, the large deformation requirements are met; meanwhile, it can be ensured that a support structure is safe, and the purposethat there is no intrusion or arch replacing is achieved, and the current difficulty of large deformation control of large-span tunnel building in a chlorite quartz schist stratum can be overcome.

Description

technical field [0001] The invention relates to the field of tunnel engineering, in particular to a large deformation control method for long-span tunnels in chlorite quartz schist 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 a thin-layered or fragmented structure in the absence of groundwater. When building long-span tunnels in high-stress chlorite-quartz schist strata, due to the weak surrounding rock, poor self-stabilization ability, and high ground stress level, if the technical measures are not appropriate, large extrusion deformations are likely to occur, resulting in cracking of the shotcrete in the tunnel , spalling, twisting and breaking of the steel frame, primary support encroachment and replacement, secondary lining cracks and blocks or even collapse, etc., ha...

Claims

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Application Information

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IPC IPC(8): E21D11/10E21D11/18E21D20/00
CPCE21D11/105E21D11/18E21D20/00
Inventor 陈建勋陈丽俊罗彦斌高贵轩王万平姚铁峰桂晓华奥张华
Owner CHANGAN UNIV
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