Curvilinear tunnel critical wind speed computing method

A technology of critical wind speed and calculation method, which is applied in mine/tunnel ventilation, calculation, earth-moving drilling and other directions, can solve problems such as the calculation formula of critical wind speed in tunnels without curves, and is beneficial to personnel evacuation, fire safety and economic benefits. Good, fast fire response effect

Active Publication Date: 2015-07-01
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL +1
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Problems solved by technology

[0008] The critical wind speed of curved tunnels is only in the qualitative research stage, and there is no clear calculation formula for calculating the critical wind speed of curved tunnels

Method used

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  • Curvilinear tunnel critical wind speed computing method
  • Curvilinear tunnel critical wind speed computing method
  • Curvilinear tunnel critical wind speed computing method

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Embodiment Construction

[0025] The present invention will be further described below in conjunction with the accompanying drawings.

[0026] Implementation example 1:

[0027] Such as Figure 1 to Figure 3 As shown, in view of the fact that the longitudinal ventilation wind speed in the existing straight tunnel is too conservative and there is no clear formula for calculating the critical wind speed of the curved tunnel, the purpose of really obtaining the "simple calculation formula for the critical wind speed under different curve radii" is specifically designed as follows:

[0028] Relying on the shield-machined circular tunnel of Line 7 of the third-phase subway project in Shenzhen, the maximum radius of the curve between Shangsha Station and Shawei Station is 1500m, the diameter of the outer contour of the tunnel is 6m, and the diameter of the inner contour is 5.4m.

[0029] Use revit2014 to build a 150m-long tunnel with a cross-section such as 1) the actual shield circular tunnel minus the bal...

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Abstract

The invention provides a curvilinear tunnel critical wind speed computing method. The curvilinear tunnel critical wind speed is computed by the following formula: Vcurve=(a+br-cr<2>+dr<3>), and value ranges of letters in the formula are as follows: 0.363<a<0.985, 3.714*10<-3><b<10.08*10<-3>, 4.628*10<-6><c<12.562*10<-6>, 1.788*10<-9><d<4.853*10<-9>. The Vcurve represents critical wind speed (m/s) under different curve radiuses, the r represents the radius (m) of a tunnel curve, wherein 400m<r<1500m. Backflow of smoke is prevented under the minimum longitudinal air supply velocity which is the critical wind speed, the smoke only can spread and extend towards the side of a fire source, personnel evacuating and fire safety are facilitated, and meanwhile the comburent dangerousness is lowered to the minimum by the critical wind speed.

Description

technical field [0001] The invention relates to the technical field of subway tunnel building fire protection, in particular to a method for calculating the longitudinal ventilation wind speed of a subway tunnel. Background technique [0002] With the construction of a large number of urban subway buildings, since the subway tunnel is in a relatively closed environment, people pay more and more attention to fire prevention in the tunnel. The air is supplied from one end of the tunnel and the smoke is exhausted from the other, so that the airflow in the tunnel flows in one direction. The current specification of the airflow velocity of the tunnel section only stipulates a range of 2m / s to 10m / s, and it is not less than the critical wind speed. value, but there is no specific calculation method for critical wind speed. [0003] Aiming at the critical wind speed value when the smoke just does not flow back, researchers at home and abroad have used theoretical calculations and ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00E21F1/00
Inventor 查晓雄曾生陈宜言姜瑞娟
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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