DETERMINING ANALYTICAL DEPENDENCES FOR HEAT FLOW IN SOIL FROM ENCLOSED TYPE SHALLOW UNDERGROUND SUBWAY STATIONS WITH DOUBLE-TRACK TUNNELS

The article presents the procedure and results of the research into the process of heat exchange between an enclosed-type subway station with a double-track tunnel and enclosing soil. The mathematical model of the soil–enclosed station heat exchange is constructed and its conformity with the in situ research data obtained in Novosibirsk Metro is estimated. The heat exchange process is analyzed by means of the finite-element modeling of nonstationary heat transmission from the subway station rooms to soil. Based on the research data, the analytical dependences of the specific heat flow from a track section, passenger platform, combined rectifier–secondary substation and a ticket hall on the occurrence depth of the station, thermophysical properties of soil and the outward climate given the steady-state operation are obtained. It is shown that the change in the value of heat flow during a year given the steady-state operation is fluctuating and sign-alternating. For the enclosed-type stations at different depth of occurrence, the time of detecting the change in the heat flow behavior and the heat loss at the station in the initial operating period (operation year 1) are determined. It is found that the heat loss in the initial operating period is considerably higher than during the steady-state operation.

Keywords

Subway, enclosed-type station, soil, specific heat flow, occurrence depth, thermophysical properties of soil, heat exchange.

Issue number: 2
Year: 2018
ISBN:
UDK: 628.8+622.4+625.042
DOI: 10.25018/0236-1493-2018-2-0-89-102
Authors: Kiyanitsa L. A.

About authors: Kiyanitsa L.A., Graduate Student, Engineer, е-mail: kla00@yandex.ru, The Federal Agency for Scientific Organizations (FASO Russia), Chinakal Institute of Mining Siberian Branch of Russian Academy of Sciences, 630091, Novosibirsk, Russia.

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