The Calculation On Moisture Transfer For Underground Cavern Walls With Different Depths

With the rapid economic development of human society, accelerating the city and urbanization, land resources are exhausted day by day. In order to meet the increasing demand of social economic development, further development of air resources at the same time, the development and utilization of underground space resources, especially in deep space resources, is the inevitable trend of social development at the present stages, the main use of underground cavers in traffic construction and energy. The basement hole is different from the buildings on the ground, the impact of topography and other factors, general buried deep underground, from the sun, by the wall penetration of moisture transfer large influence. Service life of the wet environment on hole indoor personnel health and mechanical and electrical equipment, and even has an important influence on staff.The underground projects that involving the moisture transfer calculation are worthy of further investigation, such as underground hydropower station, subway and civil defense engineering. The present study considers only the effect of humidity and pressure gradient(not considering the temperature). The mass transfer process of wall porous media in underground caverns is analyzed by employing the thermodynamics and mass transfer theory. The corresponding relation between walls and moist air pressure of caverns is obtained. Also, we present the equation of mass transfer and the depth. The analysis on relation of mass transfer coefficient with depth variation in this paper will provide references for further investigations on mass transfer problem of caverns, and improvements of the underground construction wet environment.