A Calculation Method of Air Volume Required by Full-jet Longitudinal Ventilation in Multi-ramp Urban Road Tunnel

Abstract

The invention relates to a multi-ramp urban road tunnel full jet flow longitudinal ventilation required airflow calculation method, and belongs to the technical field of tunnel ventilation. The methodincludes the steps: S1 sequentially calculating the traffic flow of sections of a mainline tunnel; S2 decomposing the mainline tunnel into a plurality of sections and numbering the sections; S3 calculating smoke dust and CO discharge amount of branched tunnels and the mainline tunnel, and collectively acquiring the total smoke dust discharge amount and the total CO discharge amount of the whole tunnel; S4 calculating total required airflow for diluting smoke dust and CO of the whole tunnel; S5 calculating the required airflow for diluting smoke dust and CO of the branched tunnels, and furthercalculating the final required airflow of the branched tunnels; S6 calculating the final required airflow of the sections of the mainline tunnel according to the final required airflow of the branched tunnels. The method has good engineering adaptability and operability, theoretical significance is clear and definite, and the required airflow for diluting harmful gas in multi-ramp urban road tunnel full jet flow longitudinal ventilation can be effectively calculated.

Description

technical field [0001] The invention belongs to the technical field of tunnel ventilation, and relates to a method for calculating the air volume required for full-jet longitudinal ventilation of multi-ramp urban road tunnels. Background technique [0002] Multi-ramp urban road tunnel is a new type of unconventional tunnel. There are few relevant studies on the ventilation design of multi-ramp urban road tunnel, especially the calculation of the air volume required for full-jet longitudinal ventilation to dilute harmful gases. [0003] Chen Yuyuan used the subway environmental control calculation software SES to assist in the calculation of the ventilation system of the multi-ramp urban road tunnel project, which strengthened the rationality of the ventilation design. Wang Yan et al. used SES software to analyze the ventilation system of a multi-ramp urban road tunnel under various vehicle speed conditions, and optimized its ventilation system operation mode. Hu Qinghua use...

AI Technical Summary

Problems solved by technology

[0006] Because the tunnel air inlet (corresponding to the diversion tunnel) or outlet air (corresponding to the confluence tunnel) enters or exits through one opening, the ventilation of the main line tunnel and the ramp tunnel and the ventilation between the ramp tunnels affect each other, the tunnel ventilation system There are multiple branches, the ventilation network is complex, and the air volume required to dilute harmful gases cannot be designed with conventional ventilation calculation methods

In this regard, the existing research and design codes do not give clear methods and regulations, resulting in a lack of guidance for the design of corresponding ventilation projects

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