地铁隧道围岩简化模型研究

A Study of the Simplified Model of the Surrounding Rock of Subway Tunnels

建立一种地铁隧道围岩简化RC传热模型,模型参数直接根据围岩的物理参数及热物性参数进行计算。并采用围岩的频域有限元模型作为基准模型对简化模型进行验证。结果表明,在核心层采用将隧道周围土壤分为左右相同的两个部分进行并联,隧道空腔部分等效成中间面积相等的矩形空腔的方法确定热容热阻参数可以获得准确的围岩简化RC传热模型,该模型与围岩的频域有限元模型(基准模型)在中低频区域(<10^(-4)rad/s)吻合很好。该简化RC模型容易与TRNSYS等热湿模拟软件包集成,能够更方便快捷地进行热特性计算与分析,并用于工程设计指导与参考。

This paper proposes a simplified RC heat transfer model for the surrounding rock of metro tunnel,and the model parameters can be calculated directly based on the physical configuration and the thermal physical parameters of the surroundings.The frequency domain finite element model of the surrounding rock is used as the benchmark for validating the simplified model.The results show that an accurate simplified RC heat transfer model of the surrounding rock can be obtained by determining the heat capacity and thermal resistance parameters in the core layer using the method of dividing the soil around the tunnel into two parts of the same left and right in parallel,and the tunnel cavity part is equal to a rectangular cavity of equal area in the middle.This model agrees well with the benchmark model in the low and medium frequency region(<10^(-4) rad/s).This simplified RC model can be easily integrated with thermal and moist simulation packages such as TRNSYS for thermal characteristics calculation and analysis more easily and quickly.It can also be used for design guidance and reference.