Abstract:

In order to meet the requirements of the airflow and heat transfer at the working faces of extralong tunnels on plateaus constructed by TBM, full study is made on the ventilation methods and ventilation equipment matching during the construction of these tunnels. With the help of many kinds of parameters, the author in the study confirms the ventilation method and calculates in detail the required airflow. After the study on the matching between the ventilation fans and the ventilation ducts by means of numerical simulation, a match of ventilation fans and ventilation ducts that can meet the ventilation requirements of the tunnel is proposed. The author also studies the air velocity distribution and thermal environment rules in the tunnel by means of numerical simulation, which offers a scientific and intuitive estimate on the environment during the tunnel construction.

Key words: West Line of Southtonorth Water Transfer Project, plateau, TBM, tunnel, ventilation during construction, numerical simulation