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A Method for Evaluating Roughness of Tunnel Ventilation Wall Surface

A technology for wall roughness and tunnel ventilation, which is applied in mine/tunnel ventilation, earthwork drilling, instruments, etc., can solve the problems of complex evaluation methods and low accuracy of tunnel wall roughness, and ensure economy and safety , the evaluation method is simple, and the effect of important engineering significance

Inactive Publication Date: 2020-01-31
SOUTHWEST JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Aiming at the above-mentioned deficiencies in the prior art, the present invention provides a method for evaluating the roughness of the tunnel ventilation wall to solve the problems that the existing methods for evaluating the roughness of the tunnel wall are complex and have low accuracy

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  • A Method for Evaluating Roughness of Tunnel Ventilation Wall Surface
  • A Method for Evaluating Roughness of Tunnel Ventilation Wall Surface
  • A Method for Evaluating Roughness of Tunnel Ventilation Wall Surface

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experiment example

[0083] Taking the mileage 2+005-2+015 of the No. 1 diversion tunnel of Jinping Diversion Tunnel as the evaluation section, the method for evaluating the roughness of the ventilation wall surface of the tunnel by the method of the present invention includes the following steps:

[0084] 1) Data measurement: the mid-latitude ZTS600 total station with an angle measurement accuracy of 2″ is used to measure the actual excavation contour of the tunnel in the tunnel evaluation section; The actual excavation contours of the vault, the left spandrel, the right spandrel, the left arch waist and the right arch waist are measured along the axial direction, and 5 sets of measurement results are obtained as follows: Figure 1 to Figure 5 shown; then the actual excavation contours of the cross-section were tested from the 000, 010 and 015 end faces of the tunnel, and three sets of measurement results were obtained as follows Figure 6 ~ Figure 8 shown.

[0085] 2) Calculate the average roug...

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Abstract

The invention discloses a method for evaluating the roughness of the ventilation wall surface of a tunnel, which includes measuring the actual excavation contour line in the axial direction and the actual excavation contour line in the cross section of the tunnel; The roughness constant value of the contour line; according to the average roughness height of the tunnel ventilation wall surface and the roughness constant information in the axial direction, the roughness of the tunnel ventilation wall surface is calculated. According to the two values ​​of the average roughness height Rh of the tunnel ventilation wall surface and the tunnel roughness constant Rc, the present invention can then determine the wall surface roughness in the tunnel ventilation, and more accurately obtain the wind speed, air volume and pollutant concentration distribution rules of the wind flow inside the tunnel, which is beneficial to the tunnel. It provides guidance for the construction ventilation design of underground engineering and has important theoretical significance and practical value.

Description

technical field [0001] The invention relates to a method for evaluating the roughness of the ventilation wall of a tunnel. Background technique [0002] At present, the construction of long tunnels is usually based on the drilling and blasting method combined with trackless transportation. During the construction period, the ventilation problem has become a major problem. During the construction process, the influence of the roughness of the tunnel wall on the actual ventilation effect is hardly considered. The "Code for Design of Ventilation and Lighting for Highway Tunnels" (JTJ026.1-1999) mainly uses the average wall roughness in the tunnel and the equivalent diameter of the tunnel section as the ventilation effect. The main considerations in the design are used to calculate the resistance coefficient along the passage; the roughness of the tunnel wall is an important parameter reflecting the ventilation of the tunnel, which directly affects the design of the ventilation ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/20E21F1/02
CPCE21F1/02G06F30/20G06F2113/14
Inventor 张恒吴瑾涂鹏林放王路孙建春张超刘效成陈寿根周泽林
Owner SOUTHWEST JIAOTONG UNIV