Large deformation control method of chlorite quartz schist stratum one-hole three-lane highway tunnel

A technology for road tunnels and control methods, applied in tunnels, tunnel linings, underground chambers, etc.

Active Publication Date: 2018-02-23
CHANGAN UNIV
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  • Abstract
  • Description
  • 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 a single-hole three-lane road tunnel in chlorite schist formation, which can ensure the safety and stability of the support structure while meeting the requirements of large deformation, and achieve non-invasion limit and non-replacement The purpose of the arch is to solve the problem of large deformation control of tunnels in chlorite schist formation

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Embodiment 1

[0033] The present invention provides a large deformation control method for a single-hole three-lane road tunnel in chlorite schist stratum, based on the method of reserving core soil for three-step annular excavation, such as figure 1 As shown, the excavation and support of the tunnel are carried out under the advance support, in which the steel frames at the tunnel arch, side walls and inverts are all made of double-layer HK200b steel, and are supported in stages, of which the first layer When the steel frame is constructed, the corresponding reserved deformation is 90~120cm, and when the second layer of steel frame is constructed, the corresponding reserved deformation is 45~60cm. Each layer of the steel frame is equipped with double-layer Φ8 steel mesh. The grid spacing is 20×20cm, which specifically includes the following steps:

[0034] (1) Advance support: use double rows of 3.5m long Φ50 advance grouting small conduits 1 with a circumferential spacing of 40cm, and mak...

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Abstract

The invention relates to the technical field of tunnel engineering, in particular to a large deformation control method of a chlorite quartz schist stratum one-hole three-lane highway tunnel. The method comprises the steps of conducting tunnel expanding excavation and supporting working under forepoling based on a three-step annular excavation reserve core soil method, wherein double-layer steel frames are adopted to arches, side walls and inverted arches of the tunnel, fractional supporting is conducted, the corresponding reserved deformation is 90-120 cm when a first layer of the steel frameis established, and the corresponding reserved deformation is 45-60 cm when a second layer of the steel frame is established. According to the large deformation control method of the chlorite quartzschist stratum one-hole three-lane highway tunnel, the large deformation requirements are met; meanwhile, it can be ensured that a support structure is safe and stable, and the purpose that there is no intrusion or arch to be replaced is achieved.

Description

technical field [0001] The invention relates to the technical field of tunnel engineering, in particular to a large deformation control method for a single-hole three-lane highway tunnel in a chlorite schist formation. Background technique [0002] The chlorite schist has a flaky structure and disintegrates when exposed to water. After the tunnel is excavated, it becomes powdery, with extremely low strength and compactness. For large-span tunnels such as single-hole three-lane road tunnels with stress levels, due to the very small strength-stress ratio of the surrounding rock and the large disturbance range of the surrounding rock caused by excavation, improper technical measures can easily cause deformation of the tunnel support Invasion, cracking and spalling of shotcrete, twisting and fracture of steel frame, cracking and falling of secondary lining or even collapse, sinking of side walls and cracking of pavement, etc., lead to delays in construction period, sharp increas...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D9/04E21D11/14E21D11/15E21D11/18E21D11/10E21D20/00
CPCE21D9/04E21D11/105E21D11/107E21D11/14E21D11/152E21D11/18E21D20/00
Inventor 陈建勋罗彦斌陈丽俊高贵轩王万平王波姚铁峰桂晓华
Owner CHANGAN UNIV
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