To clarify the heat and moisture regulation mechanism of deep-buried underground air tunnels and address the research gaps in the heat and moisture coupling between airflow and surrounding rock. This paper established a 560 m-deep ventilation shaft with a diameter of 5 m focused on the heat and moisture transfer of surrounding rock - air tunnel - airflow to investigate the airflow characteristics, analyzed the heat and moisture changes of the tunnel surface, airflow, as well as the energy storage characteristics of the surrounding rock, and compare the induced airflow characteristics across four typical cities in China. The results show that: there is an inlet effect in the deep-buried air tunnel; the wall temperature becomes basically stable after 200 m from the entrance, while a greater depth is required for the stable section of humidity; in summer, the airflow temperature decreases by more than 1℃ and the enthalpy decreases by 3.5 kJ/kg; in addition, the ground temperature in Guangzhou is relatively high, resulting in a limited effect on adjusting the intake airflow. This study aims to provide support for the energy-saving design of fresh air systems in deep-buried underground buildings.
Ma et al. (Tue,) studied this question.