地铁隧道围岩热库逐年演化特性的实验研究
Experimental study on evolution characteristics of heat reservoir of wall rock in underground railway tunnels
摘要：
通过搭建缩尺模型实验台，分析了空气侧温度周期动态变化下地铁隧道新建到远期17 a的隧道围岩土体热库变化。根据围岩土体温度场随时间分布特性，将其分为动态拓展期和动态稳定期。给出土体温度随深度逐年演化特性和热量蓄放特性，指出该实际地铁隧道模型中围岩土体热库厚度稳定在20 m，热库峰值稳定在22.7 ℃，热库特征厚度稳定在2 m。为后续解决远期运行区间隧道温升过高的问题提供参考。
Abstract：
By a scale model experimental test, analyses the evolution characteristics of the heat reservoir of wall rock in underground railway tunnels for seventeen years from new to long-term operation with periodic and dynamic air temperature conditions. According to its variation characteristics with time, divides the soil temperature distribution into the dynamic expanding period and the dynamic stable period. Presents the evolution characteristics of soil temperature with depth and the heat storage and release, and points out that the soil heat reservoir thickness is 20 meters with the peak temperature of the soil heat reservoir at 22.7 ℃ and the soil heat reservoir characteristic thickness at 2 meters. All of work provides the references for solving the tunnel temperature problems in long term underground railway operation.
Keywords:underground railway tunnel, scale model experimental test, wall rock soil, heat reservoir, heat storage and release