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Cold-region short tunnel entrance cooling determination model and test method thereof

A tunnel model and model technology, which is applied in the cold area short tunnel entrance cooling measurement model and its testing field, can solve the problems of inability to effectively reproduce the specific environment of cold area tunnels, poor control of temperature boundaries, and large errors in experimental results, so as to improve flexibility. Sex and diversity, improve the effect of heat insulation, the effect of reasonable structure

Pending Publication Date: 2017-12-22
JIANGSU VOCATIONAL INST OF ARCHITECTURAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the relevant tunnel cooling simulation test devices in cold regions have complex structures, large volumes, and cumbersome operations. Although they can simulate tunnels and thermal insulation structures, they are not effective in controlling the temperature boundary in complex environments under the influence of multiple factors, and are poorly targeted. Effectively reproduce the real and specific environment of tunnels in cold regions, and the experimental results have large errors

Method used

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  • Cold-region short tunnel entrance cooling determination model and test method thereof
  • Cold-region short tunnel entrance cooling determination model and test method thereof
  • Cold-region short tunnel entrance cooling determination model and test method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0052]A cooling measurement model for a short tunnel entrance in a cold region, comprising a model box 1, a tunnel model 2, a simulated air flow system 3, a measurement sensor system 4 and a simulated tunnel driving system 5, the tunnel model 2 is set in the model box 1, The tunnel model 2 includes a tunnel wall 201, the end of the tunnel wall 201 is fixedly connected to the side wall of the model box 1, and the tunnel wall and the side wall of the model box can be glued and inserted. In this embodiment , Adhesive bonding between the tunnel wall and the side wall of the model box. A tunnel is formed between the side wall of the model box 1 and the inner wall of the tunnel, and the measurement sensing system 4 includes a first temperature sensor 401, a display and a power supply. In this embodiment, the first temperature sensor and the second temperature sensor use The model is WRNK-191. There are multiple first temperature sensors 401, and multiple first temperature sensors 4...

Embodiment 2

[0054] The testing method of above-mentioned measuring model is characterized in that, comprises the following steps:

[0055] 1), simulation test preparation steps: first, specify the different initial airflow temperatures that need to be simulated for the test, place the tunnel model 2 at a designated position in the model box, and then adjust the tunnel simulation tunneling system insulation board 501 to the preset position according to Similar simulation tests are carried out in size and covered in layers with geotechnical materials 7 in the model box. The geotechnical materials 7 are made of soil and mountain materials in cold regions, and the tunnel model air duct 6 is connected with the simulated airflow system 3 , to seal other tunnel model air ducts 6;

[0056] 2) Steps for simulating the cooling effect of airflow at different temperatures: fix the position of the thermal insulation board 501 of the tunneling system; then make the simulated airflow system 3 produce ga...

Embodiment 3

[0060] In this embodiment, the model adopts the structure in Embodiment 1, and then in the preparation step of the simulated test, the cooling liquid mixed with ethylene glycol and water at 1:1 is put into the cavity from the entrance of the geothermal cooling bath, and the cooling liquid and The inlet of the ground temperature cooling bath and the outlet of the ground temperature cooling bath cooperate with each other to form a cooling system to adjust the bottom plate of the model box to the required ground temperature state. The air duct of the tunnel model is connected to a single or multiple second air pump air ducts as required, so as to flexibly obtain different airflow velocities, different initial temperatures and different ground temperatures. Other test steps are the same as in Example 2.

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Abstract

The invention discloses a cold-region short tunnel entrance cooling determination model and a test method thereof and relates to the technical field of indoor model tests. The cooling determination model comprises a model box body, a tunnel model, a simulated airflow system, a measuring and sensing system and a simulated tunneling system. The test method comprises a simulation test preparation step, a step of simulating cooling effects of different airflows at different temperatures, a parameter determination step and a follow-up simulated result processing step. The cold-region short tunnel entrance cooling determination model disclosed by the invention has the beneficial effects that a special environment at a cold-region short-span tunnel entrance can be simulated, pertinence is strong, tunnel cooling tests at different airflow velocities and different initial temperatures can be carried out, the cooling determination model device is easy to mount and convenient for implementation, test precision is relatively high, and a basis is provided for design of a cold-region short-span tunnel.

Description

technical field [0001] The invention mainly relates to the technical field of indoor model tests, in particular to a model for measuring the temperature drop at the entrance of a short tunnel in a cold region and a test method thereof. Background technique [0002] According to statistics, in China, which has a vast territory and diverse topography, more than half of the land belongs to the cold area. The cold area refers to the area where the annual freezing depth of the topsoil layer is greater than 800mm, mainly including the permafrost area and the seasonal frozen soil area. These types account for 20% and 55% of the country's land area respectively, and a large part of these areas are distributed in the west and northeast regions. The construction of railways in cold regions has greatly accelerated people's understanding of engineering in cold regions, but this type of tunnel is more prone to a series of diseases such as lining cracking, spalling, water leakage from the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N25/20
CPCG01N25/20
Inventor 陶祥令马金荣王建州刘明李亭
Owner JIANGSU VOCATIONAL INST OF ARCHITECTURAL TECH