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Ventilation with a Parallel Adit in a Super-Long Expressway Tunnel with a Large Overburden
(1 Survey, Design and Research Institute of China Railway Tunnel Group Co. Ltd., Guangzhou 511458; 2 Hunan Provincial Communications Planning, Survey & Design Institute, Changsha 410008)
Abstract Considering the challenge of building a shaft in mountainous areas, an operation ventilation scheme via parallel adit was proposed for expressway tunnels based on a super-long tunnel project with a large overburden in Tianshan. A study of the design of a parallel ventilation adit instead of an inclined shaft was conducted by a large number of ventilation network calculations and the analysis of the orthoronal design of the total cost of the ventilation system to analyze the short-term and long-term ventilation mechanism and ventilation scheme of this tunnel.The results show that: 1) the order of factors affecting the total costs of the ventilation system is the length of the independent ventilation section, the ventilation volume, and the ventilation duct area; 2) the selected short-term and long-term ventilation scheme has solved the problem of operation ventilation in an expressway tunnel with a low traf? fic volume; and 3) as for tunnels with lengths of several kilometers, it is not advisable for the polluted air at the front section to be totally exhausted from the ventilation duct--it may be partly exhausted to the next main tunnel section to reduce energy consumption.
Abstract：
Considering the challenge of building a shaft in mountainous areas, an operation ventilation scheme via parallel adit was proposed for expressway tunnels based on a super-long tunnel project with a large overburden in Tianshan. A study of the design of a parallel ventilation adit instead of an inclined shaft was conducted by a large number of ventilation network calculations and the analysis of the orthoronal design of the total cost of the ventilation system to analyze the short-term and long-term ventilation mechanism and ventilation scheme of this tunnel.The results show that: 1) the order of factors affecting the total costs of the ventilation system is the length of the independent ventilation section, the ventilation volume, and the ventilation duct area; 2) the selected short-term and long-term ventilation scheme has solved the problem of operation ventilation in an expressway tunnel with a low traf? fic volume; and 3) as for tunnels with lengths of several kilometers, it is not advisable for the polluted air at the front section to be totally exhausted from the ventilation duct--it may be partly exhausted to the next main tunnel section to reduce energy consumption.
2017, Vol. 54 