Ventilation type cold zone tunnel longitudinal temperature distribution experimental device

Abstract

The invention discloses a ventilation type cold zone tunnel longitudinal temperature distribution experimental device which comprises a constant temperature warehouse, a wind speed control device, a tunnel model, a constant temperature tank, a wind speed sensor, a temperature sensor and a data acquisition system. The constant temperature warehouse is used for providing a cold source, the wind speed control device is used for providing wind energy, the tunnel model is formed by connecting tunnel model units, the constant temperature tank is composed of the constant temperature bath units whichare arranged independently, the constant temperature bath units coat the outer surface of the tunnel model units, the wind speed sensor and the temperature sensor are arranged in the tunnel model andare electrically connected to the data acquisition system. The experimental device for testing the longitudinal temperature distribution law of a cold zone tunnel under a one-way or two-way ventilation condition provided by the invention can simulate the distribution law of the longitudinal temperature of a long tunnel under the conditions of different tunnel lengths, different tunnel inlet temperatures, different tunnel inlet wind speeds, different surrounding rock initial temperatures and the like, and can provide accurate parameters for the laying length of a long tunnel thermal insulationlayer in a cold zone.

Description

technical field [0001] The invention relates to an experimental device for tunnels in cold regions, in particular to an experimental device for longitudinal temperature distribution of ventilated tunnels in cold regions. Background technique [0002] In high-latitude areas such as Northwest and Northeast my country, as well as high-altitude areas in western my country, more and more tunnels are being built, and the length of the tunnels is also getting longer and longer. Taking the Western Sichuan Highland Highway Tunnel as an example, there are more than 152 km / 88 tunnels currently under construction, and in the foreseeable future, the Western Sichuan Plateau tunnels will reach 304 km / 162; Tunnels accounted for even more than 90%. According to preliminary estimates, there are more than 7 tunnels with a length of more than 30km, and some tunnels are above 4200m above sea level. At present, for tunnels in medium and short cold regions, the same anti-freezing and thawing meas...

AI Technical Summary

Problems solved by technology

Using the method of field testing of the on-site tunnel, the results obtained are the most realistic and can best meet the actual situation, and can provide accurate parameters for the laying length of the insulation layer, but there are two problems. One is that the test results can only represent a specific tunnel. Longitudinal temperature distribution of the tunnel, there are many factors affecting the longitudinal temperature distribution of the tunnel, such as: the average temperature of the coldest month at the entrance of the tunnel, natural wind speed, wind direction, tunnel length, etc. There are certain limitations in popularization and application. A large amount of manpower, material and financial resources, a large amount of engineering, general economical practicability; second, only the data test results after the tunnel is completed and opened to traffic can represent the actual longitudinal temperature distribution of the tunnel. the actual needs of

Theoretical analysis is too idealistic, with too many assumptions, and it is difficult to meet engineering needs. Even if it can meet the needs, it needs to be verified

Therefore, generally speaking, there is still a lack of an effective means to study the longitudinal temperature distribution of tunnels in cold regions.

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