Simulation test method of ventilation on-way frictional resistance coefficient of curved tunnel

A simulation test and frictional resistance technology, which is applied in aerodynamic tests, machine/structural component testing, measuring devices, etc., can solve problems such as errors, inability to carry out research on frictional resistance coefficients, and results that cannot be effectively confirmed. easy effect

Inactive Publication Date: 2012-08-15
中铁西南科学研究院有限公司
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Problems solved by technology

Obviously, in the ventilation design of a curved tunnel, if the empirical value method is used to determine the frictional resistance coefficient, errors will inevitably be caused, especially in the case of a small curve radius and a large corner, the wind flow state is different from that of a straight line. The situation is completely different, and still using the empirical value method may cause unacceptable results
Secondly, the on-site test method can indeed obtain a more accurate coefficient of frictional resistance, but it may cause other adverse consequences due to interference with construction or operation, and it i

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  • Simulation test method of ventilation on-way frictional resistance coefficient of curved tunnel
  • Simulation test method of ventilation on-way frictional resistance coefficient of curved tunnel

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[0021] This method takes the small-radius spiral curved tunnel on the Yalu Expressway—Tiezhaizi No. 1 Tunnel as the prototype tunnel to carry out the simulation verification test. The actual wall roughness of the prototype tunnel is 1.12cm, and the actual air volume of the prototype tunnel to be measured is about 24m 3 / s. The similarity ratio of the simulation test is 1:24, and the test air volume after similar conversion is about 1.0m 3 / s; the prototype tunnel curve radius is 600m.

[0022] see Figure 1~3 ,

[0023] 1), according to the similarity ratio, make a curved model tunnel 12 with a section shape similar to the prototype tunnel, a curve radius of 25m, and a connection angle of up to 120° with a material such as glass fiber reinforced plastics according to the axis curve length of 1m. According to the similarity ratio, make a straight line model tunnel 11 with sufficient length for rectification;

[0024] 2) Customize the sandpaper 2 with a roughness of 0.46 mm...

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Abstract

The invention provides a simulation test method of a ventilation on-way frictional resistance coefficient of a curved tunnel and belongs to the technical field of a tunnel ventilation disaster-preventing technology. The simulation test method comprises the following steps of: selecting an appropriate similarity ratio and manufacturing a curved model tunnel and a straight-line model tunnel for rectification section by section; selecting sand paper as an inner surface of the curved model tunnel; connecting the curved model tunnel with the straight-line model tunnel and a rectifying circular tube; connecting the rectifying circular tube with a test fan; mounting static-pressure test tubes on the curved model tunnel at two end points with the length to be detected; inserting a pitot tube into a small test hole of the rectifying circular tube; externally connecting a micro-manometer; providing a test air quantity by the fan; and substituting a measured static pressure difference value and a dynamic pressure value into a formula to calculate the frictional resistance coefficient in the curved model tunnel. By comparing a result obtained by a simulation test with an actual numerical calculation result, the requirement on acceptable precision in engineering is met.

Description

technical field [0001] The invention relates to a friction coefficient simulation test technology in the technical field of tunnel ventilation and disaster prevention. In particular, it relates to the simulation test technology of the frictional resistance coefficient along the ventilation of the curved tunnel. Background technique [0002] At present, when people determine the frictional resistance coefficient along the tunnel ventilation, there are three common methods: (1) the empirical value method, that is, according to the past experience data, the value is randomly selected within a certain range; (2) the field test method , that is, the data is obtained through on-site measurement (see "Testing Research on the Ventilation Resistance Coefficient of Shotcrete Lined Tunnel" in Volume 18, Issue 1 of "Journal of China Highway Society"); (3) Numerical calculation method, that is, by establishing a numerical calculation model, through Calculated by computer. All three met...

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Application Information

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IPC IPC(8): G01M9/00G01M9/08
Inventor 高菊茹徐辰丁伍晓军涂文轩王书科罗建春袁玮张博黄承军
Owner 中铁西南科学研究院有限公司
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