Distribution Characteristics and Evolution Law of Ground Temperature in Lanzhou Subway

被引：1
|
作者：
Zhang H. [1 ,2 ]
Zhu J. [1 ]
Ma G. [1 ]
Zhen Z. [1 ,3 ]
Gai Y. [1 ]
机构：
[1] School of Civil Engineering and Mechanics, Lanzhou University, Lanzhou, 730000, Gansu
[2] Key Laboratory of Mechanics on Disaster and Environment in Western China of Ministry of Education, Lanzhou University, Lanzhou, 730000, Gansu
[3] Northwest Research Institute Co., Ltd. of C.R.E.C., Lanzhou, 730000, Gansu
来源：
Zhongguo Tiedao Kexue/China Railway Science | 2020年 / 41卷 / 02期
关键词：
Annual variable temperature layer; Ground temperature; Heat penetration thickness; Lanzhou subway; Temperature gradient; Temperature of surrounding rock;
D O I：
10.3969/j.issn.1001-4632.2020.02.08
中图分类号：
学科分类号：
摘要：
Taking Lanzhou subway as the research object, the ground temperature before the excavation of the subway tunnel was measured (referred to as the initial ground temperature). According to the measured data, the prediction model formula of the initial ground temperature of the subway was put forward. The numerical model of unsteady heat transfer was used to analyze the evolution law of surrounding rock temperature of the subway tunnel under operation conditions. Results show that the initial ground temperature of Lanzhou subway changes with the variation of the ambient temperature and burial depth; the annual variable temperature layer is located from the surface to the burial depth of 12 m; the annual constant temperature layer is located at the burial depth of 12 m and below, and the temperature is about 15℃; in the annual variable temperature layer, the variation of initial ground temperature within one year is similar to that of the ambient air temperature, which is approximately sinusoidal distribution, but there is the phase lag phenomenon; the amplitude of initial ground temperature decreases exponentially with the increase of the burial depth in one year; in the heat exchange between the air and the surrounding rock in the tunnel, the temperature and gradient of the surrounding rock in Lanzhou subway tunnel and the heat penetration thickness (when the limit is not reached) are all positively related to the temperature and the time of heat exchange in the tunnel, but negatively related to the distance from the inner wall of the tunnel. © 2020, Editorial Department of China Railway Science. All right reserved.
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页码：63 / 72
页数：9
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