深埋地下工程围护结构传热过程数值分析

Numerical analysis of heat transfer in the exterior envelope of deep buried underground engineering

地下工程预热期结束时的温度分布应作为使用期的初始条件参与计算,但实际应用中,常假设使用期初始壁温仍保持岩体自然温度以简化计算。为了探讨深埋地下工程预热期向使用期过渡时初始条件简化对计算结果的影响,利用MATLAB编程分别模拟两种初始条件下的传热过程。结果表明,采用岩体自然温度作为初始条件时,使用时间达到400 h之后岩体温度才与预热期结束时的温度相当,也即在进行初始条件的简化时,应当保证计算时间不少于400 h,否则会有较大的误差。

The ending temperature of warm-up period should be used as the initial condition of working period,but actually,it is always assumed that the initial temperature of the exterior env-elope remains the natural rock temperature to simplify the calculations.MATLAB is being used to simulate the heat transfer of two different initial conditions in order to explore the influence of the simplification.The results show that when using natural rock temperature as the initial conditions,the influence would last 400 h.