Unlock instant, AI-driven research and patent intelligence for your innovation.

Plateau tunnel fire smoke control wind speed design method

A design method and tunnel technology, applied in mine/tunnel ventilation, mining equipment, earthwork drilling, etc., can solve problems such as tunnel operation safety, adverse effects on energy saving, and difficulty in disaster prevention ventilation design, so as to control the spread of fire smoke , Guarantee energy saving and operation safety, and control the effect of personnel evacuation

Active Publication Date: 2020-04-28
SOUTHWEST JIAOTONG UNIV
View PDF6 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Plateau tunnel fire smoke control wind speed design method
  • Plateau tunnel fire smoke control wind speed design method
  • Plateau tunnel fire smoke control wind speed design method

Examples

Experimental program
Comparison scheme
Effect test

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 the 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 ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a plateau tunnel fire smoke control wind speed design method. The method comprises the steps of applying fire dynamics software FDS to obtain ventilation critical wind speeds corresponding to highway tunnel fires of different scales under different altitude conditions; combining a critical wind speed result, and applying dimensionless analysis to obtain a dimensionless tunnel critical wind speed expression; carrying out a tunnel model test, and determining and obtaining a tunnel fire source heat release rate change rule under different altitude conditions; and correcting the dimensionless tunnel critical wind speed expression in combination with the tunnel fire source heat release rate change rule under different altitude conditions to obtain the tunnel fire smoke control wind speed design method under different altitude conditions. According to the method, the influence of plateau, low-air-pressure, low-temperature and low-oxygen-content environments on the critical wind speed of the tunnel fire is defined, the change rule of the critical wind speed of the highway tunnel at different altitudes is revealed, the critical wind speed of the highway tunnel fireat any altitude can be obtained, and the method is particularly suitable for the critical wind speed of the highway tunnel fire in plateau areas.

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 ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
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