Method for calculating the length of insulated water ditch at tunnel entrance in cold and severe cold area

A calculation method and tunnel technology, applied in the direction of calculation, design optimization/simulation, special data processing application, etc., can solve the problem of lack of quantitative calculation method, and achieve the effect of improving accuracy

Active Publication Date: 2019-03-19
CHINA RAILWAY FIRST SURVEY & DESIGN INST GRP
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Problems solved by technology

The design of the length of the thermal insulation ditch at the tunnel entrance is usually based

Method used

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  • Method for calculating the length of insulated water ditch at tunnel entrance in cold and severe cold area
  • Method for calculating the length of insulated water ditch at tunnel entrance in cold and severe cold area
  • Method for calculating the length of insulated water ditch at tunnel entrance in cold and severe cold area

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Embodiment Construction

[0028] The present invention will be described in detail below in conjunction with specific embodiments.

[0029] The invention relates to a method for calculating the installation length of a heat-insulating ditch at the entrance of a tunnel in cold and severe cold areas, including:

[0030] Step 1: Analysis of the influence of solar radiation on the tunnel entrance. Analyze the solar radiation conditions at the entrance of the tunnel in cold and severe cold regions, judge the solar radiation at the entrance of the tunnel and calculate the tunnel entrance through three influencing factors: the azimuth of the slope of the tunnel entrance, the natural slope of the slope and the geographical latitude Solar radiation index;

[0031] Step 2: Draw up the equation form. Taking the solar radiation index at the tunnel entrance and the coldest monthly average temperature at the entrance of the tunnel as independent variables, the measured icing length of the drainage channel of the railway ...

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Abstract

A method for calculating the length of insulated water ditch at tunnel entrance in cold and severe cold area features that the solar radiation at tunnel entrance in cold and severe cold area is analyzed and the solar radiation index at tunnel entrance is calculated. Taking the solar radiation index at the tunnel entrance, the coldest monthly average temperature at the tunnel entrance, the measuredice length of the drainage channel, the corresponding length of the insulating ditch and the ice length of the ditch as the influencing factors, the nonlinear curved surface equation is formulated. Using multiple nonlinear regression, the undetermined parameters of multiple nonlinear curved surface equation are calculated, and the formula for calculating the length of tunnel thermal insulation ditch in cold and severe cold regions is obtained. The invention overcomes the shortcoming that the prior art can not theoretically qualitatively and quantitatively analyze the length of the heat preservation water ditch, puts forward a pertinent calculation method, and improves the accuracy of the calculation of the length of the heat preservation water ditch at the tunnel entrance in cold and severe cold regions.

Description

Technical field [0001] The invention relates to the field of tunnel cold protection, and in particular to a method for calculating the length of the thermal insulation ditch at the entrance of the tunnel in cold and severe cold regions. Background technique [0002] According to the survey of tunnel frost damage in my country's already built severely cold areas, tunnel frost damage generally starts from partial icing of the drainage channel. According to statistics on a newly-built high-speed railway tunnel in northwest my country, some of the tunnels have been built with local drainage channels frozen, which seriously threatens driving safety. In particular, the tunnel entrance is located on the shady slope of the mountain and the temperature is low, and the problem of icing is more prominent. The judgment of the shady and sunny slopes of the mountain is directly affected by solar radiation. [0003] A perfect and effective drainage system and reliable cold-proof and heat-preserv...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/13G06F30/20
Inventor 何永旺陈霄汉靳宝成李国良黄双林符亚鹏刘国庆严文翔司剑钧田鹏王新东谭永庆
Owner CHINA RAILWAY FIRST SURVEY & DESIGN INST GRP
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