Complementary Ventilation Design Method for a Highway Twin-Tunnel Based on the Compensation Concept

Table 2

Calculation results for different tunnel design air volume combinations.

							Gross power
(m^3/s)			s1 (m^3/s)	s2 (m^3/s)	Δs (m^3/s)	Δs/s2 (%)	s1 (kW)	s2 (kW)	Δs (kW)	Δs/s2 (%)
500	4764	1805	155	187	32	17.11	2116.4	2287.6	171.2	7.48
480	4574	1680	175	203	28	13.79	2065.9	2248.7	182.8	8.13
460	4383	1563	191	217	26	11.98	2103.7	2301.4	197.7	8.59
440	4193	1452	206	228	22	9.65	2181.6	2370.7	189.1	7.98
420	4002	1347	217	238	21	8.82	2211.4	2409.8	198.4	8.23
400	3812	1248	227	245	18	7.35	2271.3	2454.3	183	7.46

Note: when the design air volume of the right tunnel is taken as 400 m³/s, Ln is close to 3800 m; if the ventilation layout is designed according to the data in the table, the pollutant concentration of the second interchange channel in the uphill tunnel would exceed the specified admissible values.