Experiment and Analysis of Heat and Moisture Behavior of Underground Space and its Surrounding Ground

本研究的目的是通过实验和分析来阐明地下结构热湿环境变化对周围地面的影响以及周围地面热湿环境对地下室内部环境的影响等相互作用。在工程期间，在一个100W的白炽灯始终点亮，换气次数约为5次的地下室条件下，测量了地下空间的温湿度、墙面的表面凝结、周围地面的温湿度、室外的温度、湿度和太阳辐射、地下水位等。结果表明：春夏两季围护结构表面在底板及墙体下部发生结潮，地下水位平均深度为4.2m，大量发生后逐渐变浅，最大变化幅度约为85cm。利用历年试验数据，利用热湿耦合传递方程对地下空间的热湿特性进行了数值分析。数值结果与实验结果进行了比较。结果表明，在地下空间及其周围地面的室温、湿度方面，数值计算结果与实验结果吻合较好。因此，该分析方法对地下空间的热设计和防潮设计是有效的。

The purpose of this research is to clarify experimentally and analytically such mutual actions that the effect of the change of heat and moisture environment in underground structure on the surrounding ground and the effect of heat and moisture environment in the surrounding ground on the internal environment in the basement.Temperature and humidity in the underground space, surface condensation on the walls, temperature and moisture contents in the surrounding ground, outdoor temperature, humidity and solar radiation, the depth of water table and so on were measured during the term of project in the conditions which an 100W incandescent lamp was always lighted and the rate of air change was about 5 times in a basement. It was shown that moisture condensation of the envelope surface is occurred at the floor and the lower parts of the walls through spring and summer, and the average depth of water table is 4.2m and became to shallow after the large quantity of the maximum change of the variation was about 85cm. Numerical analysis of heat and moisture behavior of the underground space by couple heat and moisture transfer equations is performed using the annual experimental data. The numerical results are compared with the experimental results. The results show that the numerical results agree with the experimental results in terms with room temperature and humidity of the underground space and its surrounding ground. Therefore the analytical method is valid for thermal design and moisture proof design of underground spaces.