A Design Method for Smoke Control Wind Velocity in Plateau Tunnel Fire
A technology for tunnels and fires, applied in the design of fire control wind speed in plateau tunnels, can solve the problems of tunnel operation safety, adverse effects of energy saving, and difficulties in disaster prevention and ventilation design, so as to control the spread of fire smoke and personnel, and ensure energy conservation and operation. Safety, the effect of improving safety
Active Publication Date: 2021-12-21
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology
This has caused certain difficulties in the disaster prevention and ventilation design of plateau highway tunnels, and adversely affected tunnel operation safety and energy conservation.
Method used
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Embodiment
[0032] In this example, a typical two-lane road tunnel section is selected, and the full-scale curved roof model of the tunnel is established by using FDS software; and based on the Chengdu Plain, the variation law of the heat release rate of the fire source under different altitude conditions is studied; the smoke control wind speed of the plateau tunnel fire is obtained design method.
[0033] 1) In this embodiment, a typical two-lane highway tunnel section is selected, and FDS software is used to establish a full-scale curved roof model of a 12m (width) × 9m (height) × 300m (length) tunnel, as shown in figure 1 . The grid size within 20 meters near the fire source is set to 0.167m, and the grid size of other sections is 0.333m, such as figure 2 . Using this model, the numerical calculation results of critical wind speeds of different fire scales are shown in the following table:
[0034]
[0035] From image 3 It can be seen that as the altitude increases, that is, ...
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The invention discloses a design method for wind speed control of fire smoke in plateau tunnels. Including: use the fire dynamics software FDS to obtain the ventilation critical wind speeds corresponding to different scales of highway tunnel fires at different altitudes; combine the critical wind speed results, apply dimensionless analysis to obtain the dimensionless tunnel critical wind speed expression; carry out tunnel model tests to determine And obtain the change law of heat release rate of tunnel fire fire source under different altitude conditions; combined with the change law of heat release rate of tunnel fire fire source under different altitude conditions, modify the dimensionless tunnel critical wind speed expression, and obtain the smoke control of tunnel fire under different altitude conditions Wind speed design method. The invention clarifies the influence of plateau, low air pressure, low temperature and low oxygen content environment on the critical wind speed of tunnel fire, reveals the change law of critical wind speed of road tunnel at different altitudes, can obtain the critical wind speed of road tunnel fire at any altitude, and is especially applicable Critical wind speed of highway tunnel fire in plateau area.
Description
technical field [0001] The invention belongs to the technical field of tunnel fire prevention and disaster reduction design, and in particular relates to a fire control wind speed design method for plateau tunnels characterized by low air pressure, low temperature and low oxygen content in plateau areas. Background technique [0002] Road tunnels in high-altitude areas have significant environmental characteristics of "three lows", namely low air pressure, low temperature, and low oxygen content. The disaster prevention and ventilation design of tunnels must be significantly different from those in plain areas. For road tunnel fires, the critical wind speed, as a key parameter of the disaster prevention ventilation control method, is particularly important for the disaster prevention ventilation design. According to the existing road tunnel ventilation design rules, the road tunnel with longitudinal smoke exhaust is adopted. When a fire occurs in the tunnel, the ventilation ...
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IPC IPC(8): E21F1/02E21F17/00
CPCE21F1/02E21F17/00
Inventor 王峰张路华朱磊黄玉冰罗飞宇戴开来王宇
Owner SOUTHWEST JIAOTONG UNIV