Study on Ventilation Methods during the Construction Period of Long and Large Headrace Tunnel of Changbo Hydropower Project
The total length of the headrace tunnel in Changbo Hydropower Project is about 22.1 km,with each single tunnel length of about 11.1 km.In the control section of the adit 2#and adit 3#,the maximum length of one-way excavation reached 3.31 km and 3.70 km(including adit length),respectively,and the di-ameter of the excavation section of the main tunnel has reached 14.2 m～15.0 m.Through the calculation of the air demand for the construction period,the additional ventilation shafts can effectively reduce the distance of tunnel air supply,but the long lengths of ventilation shafts only operate during partial tunnel construction.Whether to add additional ventilation shafts has become a key issue in ventilation design.This article compares in the economic and technical aspects for mixed mechanical ventilation and duct ventilation,and the duct venti-lation scheme is selected as more economically and technically reasonable,which can provide reference for simi-lar engineering designs.
Long tunnelsConstruction ventilation volumeVentilation methodsVentilation costs
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