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Method for determining ventilation on-way resistance of curved tunnel

A determination method and technology for tunnel ventilation, applied in mine/tunnel ventilation, earthwork drilling, sustainable transportation, etc., can solve problems such as the operation safety and energy saving impact of curved tunnels, and the difficulty of designing ventilation systems for curved tunnels, so as to ensure operation. Safety and energy saving effect

Inactive Publication Date: 2012-02-01
王明年
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Problems solved by technology

This has caused great difficulties in the design of the ventilation system of curved tunnels, and will have a serious impact on the operational safety and energy saving of curved tunnels

Method used

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  • Method for determining ventilation on-way resistance of curved tunnel
  • Method for determining ventilation on-way resistance of curved tunnel
  • Method for determining ventilation on-way resistance of curved tunnel

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Embodiment Construction

[0038] The section of the model tunnel in this embodiment adopts the actual section form of Ganhaizi Tunnel and Tiezhaizi No. 1 Tunnel, and the wall roughness of the curved tunnel is taken as 0.8mm and 8mm respectively. The method for determining the resistance along the ventilation path of a curved tunnel includes the following steps:

[0039] 1) The determination method for analyzing the resistance hf along the straight line tunnel is as follows:

[0040] h f = λ · l d · v 2 2 g - - - ( A )

[0041] In the above formula: l is the length of the tunnel m; d is the equivalent diameter of the tunnel section m; v is the average velocity of the section inside the tunnel, m / s; g is the acceleration...

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Abstract

The invention relates to a method for determining the ventilation on-way resistance of a curved tunnel, which comprises the following steps: 1) analyzing a method for determining the on-way resistance hf of a linear tunnel; 2) establishing a mathematical model for calculating the on-way resistance of the tunnel, a geometrical model of a curved tunnel with a radius of 150-10000m, a geometrical model of the linear tunnel and a physical model of air flow in the tunnel space by using the computational fluid mechanics (CFD) method and large fluid mechanics software FLUENT; 3) determining two limit roughness resistance coefficients Lambda f by the models; 4) determining the resistance and the resistance coefficient of an air flow stable distance in the curved tunnel; 5) when the radius is smaller than 2000m, carrying out non-linear fitting on the ratio of the on-way resistance coefficients of the curved and linear tunnels to obtain Lambda (R)= 1.8235 Lambda (Linear) R-0.078; and 6) determining the on-way resistance hf(R) of the curved tunnel based on the Lambda (R). The method can obtain the accurate on-way resistance coefficient of the curved tunnel, and the coefficient also fully reflects the influences of linear structure and wall-surface roughness of the tunnel. Thus, the invention fills the blank of researching the ventilation on-way resistance of the curved tunnel, provides scientific proofs for the design of the ventilation on-way resistance of the curved tunnel, has important engineering senses, and ensures the safe operation and energy saving of the curved tunnel.

Description

[0001] (1) Technical field: The present invention relates to a method for determining resistance along a curve tunnel ventilation, which belongs to the category of tunnel ventilation (E21F). (two) background technology: [0002] With the rapid development of tunnel engineering in my country, especially the rapid development of highway tunnels, the importance of tunnel ventilation engineering has gradually been highly valued by relevant researchers, designers and construction personnel. The design of tunnel ventilation engineering becomes the key to tunnel safe operation and efficient and energy-saving operation. At present, the linear design of tunnel engineering in my country has developed from a single linear shape to a curved shape, or even a spiral shape. Such as: Beijing-Kunming Expressway Ya’an-Lugu Project in Sichuan Province Ya’an-Shimian-Lugu Expressway Section Double Helix Tunnel, Ganhaizi Tunnel and Tiezhaizi No. 1 Tunnel. The change of the alignment of the curved ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21F1/00G06F17/50
CPCY02T90/00
Inventor 王明年王峰郭春于丽刘大刚童建军张安睿
Owner 王明年