地下工程岩土环境初始温度场数字仿真

为了精确计算地下工程岩土环境下的传热问题,建立了第一类和考虑辐射影响的第三类边界条件下地下工程岩土初始温度场模型。开发了地下工程岩土初始温度场软件,避免了复杂的测量过程。通过与南京地区实测数据比较,证明了该理论模型和软件的正确性。结果表明,第三类边界条件下温度场需要一定的时间才能稳定并与实测值相符。对于南京地区,至地下15m左右处年温度波动趋于消失。岩土表面与周围大气对流换热系数对于浅层的岩土温度场影响较大,随着深度的增加,其值对岩土温度场的影响减小。

Digital simulation of initial temperature profile in rock andsoil for underground engineering

To calculate the heat t ransfer in rock and soil for undergr ound engineering accurately , the init ialtemperature prof ile mathematical mo del of ro ck and soil for under ground engineering w ith the first andthird boundary co ndit ions w as derived. Based on this, a too lkit for calculat ing the init ial temperature profilewas dev elo ped to compute the soil and/ or ro ck temperatures at dif ferent depths and t ime w hich avo idedthe diff icult ies in the f ield test . Finally , the toolkit w as validated by the measured data in Nanjing. T he results show that it may take some time for the thir d kind boundary condit ion to achieve the measured results, that the annual temperature fluctuate disappears at the depth of about 15 m in Nanjing, that theco nvection heat t ransfer co ef ficient influences the temperature pro file more in the shallow layer of the soilthan in the deep layer and that the influence decreases as the depth increases