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Tunnel forepoling system design method and tunnel forepoling design method

A technology of advanced support and design method, applied in computing, instrumentation, electrical and digital data processing, etc., can solve problems such as relying on engineering experience

Active Publication Date: 2019-09-06
SOUTHWEST JIAOTONG UNIV
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  • Claims
  • Application Information

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Problems solved by technology

However, the current tunnel advance support design method is only aimed at a single support measure, and mostly depends on engineering experience. With the extensive promotion and application of the tunnel mechanized full-section method, it is urgent to establish a quantitative and systematic advance support system design. method

Method used

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  • Tunnel forepoling system design method and tunnel forepoling design method
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  • Tunnel forepoling system design method and tunnel forepoling design method

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Embodiment 1

[0071] Full-section excavation has fewer disturbances to the surrounding rock, simple procedures, and high construction efficiency. Therefore, large-scale mechanized full-section construction methods are the development direction of tunnel construction. However, this large-scale mechanized full-section construction method has a large excavation area and the tunnel face is prone to instability. , landslides, so the current full-section method is mainly used in grades I to III surrounding rock. Under weak surrounding rock conditions, the traditional step method is mainly used.

[0072] Reasonable advanced support measures can effectively improve the stability of the tunnel face, and it is a powerful means to realize the mechanized full-section excavation of weak surrounding rock tunnels.

[0073] The current tunnel advance support design method is only for a single support measure, and mostly depends on engineering experience. Commonly used advanced support measures include adv...

Embodiment 2

[0177] Embodiments of the present invention further provide a method for designing tunnel advance support, comprising the following steps:

[0178] Based on the classic wedge model, calculate the face stability coefficient K,

[0179] Among them, it is assumed that the whole face of the tunnel is damaged by the full-section method, and the tunnel face of the upper step is partially damaged by the micro-step method, and the angle between the failure surface and the horizontal direction is straight line, see figure 2 .

[0180] According to the limit equilibrium method, the formula for calculating the stability coefficient K of the tunnel face is:

[0181]

[0182] In formula 1, F 1 , F 2 are the anti-sliding force and sliding force of the wedge-shaped body of the face, respectively, and K is the stability coefficient of the face.

[0183] According to the horizontal and vertical static balance conditions of the face wedge, combined with formula 1, the calculation form...

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Abstract

The tunnel forepoling design method includes the steps: based on a classic wedge-shaped body model, comparing the size relation between the stability coefficient K of a tunnel face and the designed stability coefficient [K] of the tunnel face, to guide the design of forepoling measures; if the stability coefficient K of the tunnel face is smaller than or equal to the designed stability coefficient[K] of the tunnel face, sequentially adding a tunnel face sprayed concrete forepoling measure, a lead pipe-shed support measure, a tunnel face anchor rod forepoling measure and a tunnel face groutingforepoling measure; and until the stability coefficient K is greater than the designed stability coefficient [K] of the tunnel face, establishing a forepoling system design method for mechanized full-section construction of the weak surrounding rock tunnel, and realizing quantitative design of tunnel forepoling.

Description

technical field [0001] The invention relates to the field of tunnel engineering, in particular to a design method for a tunnel advance support system and a tunnel advance support design method. Background technique [0002] With the rapid development of my country's economy, the construction scale and difficulty of railway tunnels are getting bigger and bigger. As of the end of 2017, China has planned a total of 2,687 high-speed railway tunnels, with a cumulative length of about 5,482km. The large-scale mechanized full-section method is China's high-speed railway tunnel The direction of development of construction methods. Full-face excavation has few disturbances to the surrounding rock, simple process, and high construction efficiency, but the excavation area is large, and the face of the tunnel is prone to instability and collapse. Therefore, it is currently mainly used in grades I-III and weak surrounding rock conditions. , the traditional step method is mainly used, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F2119/06G06F30/20Y02E10/20
Inventor 王明年张宵刘大刚童建军赵思光王志龙姚萌杨涅张艺腾
Owner SOUTHWEST JIAOTONG UNIV
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