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将围岩温度场的导热微分方程及其单值性条件转化为无因次形式 ,将求解巷道壁面温度或围岩散热量的问题归结为求解不稳定换热准数 Kuτ.利用二维不稳定导热方程的时间相关基本解建立边界积分方程 ,用边界单元法计算风流与围岩不稳定换热准数 .在此基础上编制了计算机程序 ,根据计算结果绘制了巷道不稳定换热准数随毕渥准数 Bi及傅立叶准数 Fo的变化曲线 .对于实际问题 ,可先计算该问题对应的 Fo和 Bi,再按本文方法确定 Kuτ,最后可计算出巷道围岩散热量 .
The thermal differential equation of the surrounding rock temperature field and its univariate conditions are transformed into a dimensionless form, and the problem of solving the wall temperature of the roadway or the heat dissipation of the surrounding rock can be attributed to solving the unstable heat exchange standard Kuτ.Using two-dimensional instability The boundary element method is used to calculate the air flow and the unstable heat transfer standard of the surrounding rock based on the basic time-dependent solution of the heat conduction equation. Based on this, a computer program is compiled. According to the calculation results, the unsteady heat transfer criterion Biwa Quasi Bi and Fourier Quasi Fo. For practical problems, we can calculate the Fo and Bi corresponding to the problem, and then determine Kuτ according to the method of this paper. Finally, we can calculate the heat dissipation of surrounding rock.