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A soft rock large deformation tunnel support structure system and its construction method

A support structure and large deformation technology, applied in tunnels, tunnel linings, earthwork drilling and mining, etc., can solve the problems of increasing lining thickness, encroachment of surrounding rocks in a large area, and unpredictable construction period, so as to reduce the pressure of surrounding rocks , the effect of controlling tunnel settlement

Active Publication Date: 2019-06-11
CHANGAN UNIV
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Problems solved by technology

[0002] Due to the lack of self-supporting capacity of soft rock, tunnel excavation often has the characteristics of large deformation, fast deformation rate and long duration. Large-scale encroachment of rock, spalling and falling of shotcrete, twisting and deformation of steel frame or even misalignment, and cracking of secondary lining, etc., and then measures such as frequent removal and replacement of steel frame, secondary excavation, and increase of lining thickness have to be taken, which not only wastes materials, which cause problems such as uncontrollable project cost, unpredictable construction period and unguaranteed construction safety.
It can be said that the problem of large deformation of soft rock tunnels is a worldwide problem in the field of tunnel engineering and has not been well resolved. It is urgent to invent a support structure system and its construction method that are suitable for large deformation requirements of soft rock tunnels

Method used

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  • A soft rock large deformation tunnel support structure system and its construction method
  • A soft rock large deformation tunnel support structure system and its construction method
  • A soft rock large deformation tunnel support structure system and its construction method

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Embodiment Construction

[0029] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0030] The soft rock large deformation tunnel support structure system provided by the embodiment of the present invention, such as Figure 1~3 As shown, it includes the elastic foam board 1 on the outer layer of the arch, the steel frame on the outer layer of the arch 2, the anchor pipe 3 at the arch foot of the upper step, the longitudinal channel steel joist 4, the small conduit for advance grouting 5, and the outer layer of the arch Shotcrete 6, the outer elastic foam board on the left side of the lower step 7, the outer steel frame on the left side of the lower step 8, the anchor pipe at the f...

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Abstract

The invention relates to the field of tunnel engineering, in particular to a soft rock large deformation tunnel supporting structure system and a construction method thereof. By setting double-layer elastic foam boards between the surrounding rock and the primary support, enough surrounding rock deformation space is reserved to meet the large deformation requirements of soft rock tunnels, which can not only avoid the encroachment problem caused by excessive deformation of the surrounding rock, Moreover, it can effectively reduce the surrounding rock pressure acting on the support structure; the initial support is strengthened, and the use of double-layer initial support can avoid spalling and falling of shotcrete and twisting and breaking of steel frames caused by excessive force on the support structure , secondary lining cracking and other phenomena, and finally ensure the safety and reliability of the soft rock large deformation tunnel support structure; in view of the characteristics of soft rock large deformation tunnel system anchor bolt effect is not obvious and time-consuming and labor-intensive, cancel the system anchor bolt in soft rock large deformation tunnel Based on the application in the tunnel, the measure of strengthening the longitudinal connection between the anchor pipe and the steel frame is proposed, and the corresponding reasonable support parameters are given to better control the tunnel settlement.

Description

1. Technical field: [0001] The invention relates to the field of tunnel engineering, in particular to a soft rock large deformation tunnel supporting structure system and a construction method thereof. 2. Background technology: [0002] Due to the lack of self-supporting capacity of soft rock, tunnel excavation often has the characteristics of large deformation, fast deformation rate and long duration. Large-scale encroachment of rock, spalling and falling of shotcrete, twisting and deformation of steel frame or even misalignment, and cracking of secondary lining, etc., and then measures such as frequent removal and replacement of steel frame, secondary excavation, and increase of lining thickness have to be taken, which not only wastes Materials, but also lead to uncontrollable project cost, unpredictable construction period and construction safety can not be guaranteed. It can be said that the problem of large deformation of soft rock tunnels is a worldwide problem in the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D11/00E21D11/18E21D11/10E21D11/38E21D20/00E21D9/00
CPCE21D9/00E21D9/001E21D11/00E21D11/10E21D11/18E21D11/183E21D11/38E21D20/00
Inventor 陈建勋罗彦斌陈丽俊刘钦黄沛
Owner CHANGAN UNIV
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