Muñoz E, Frutos B, Olaya M, Sánchez J
Eduardo Torroja Institute for Construction Sciences IETCC-CSIC, Serrano Galvache 4, 28033, Madrid, Spain.
Eduardo Torroja Institute for Construction Sciences IETCC-CSIC, Serrano Galvache 4, 28033, Madrid, Spain.
J Environ Radioact. 2017 Oct;177:280-289. doi: 10.1016/j.jenvrad.2017.07.006. Epub 2017 Jul 17.
The focus of this study is broadly to define the physics involved in radon generation and transport through the soil and other materials using different parameter-estimation tools from the literature. The effect of moisture in the soil and radon transport via water in the pore space was accounted for with the application of a porosity correction coefficient. A 2D finite element model is created, which reproduces the diffusion and advection mechanisms resulting from specified boundary conditions. A comparison between the model and several analytical and numerical solutions obtained from the literature and field studies validates the model. Finally, the results demonstrate that the model can predict radon entry through different building boundary conditions, such as concrete slabs with or without joints, variable slab thicknesses and diffusion coefficients, and the use of several radon barrier membranes. Cracks in the concrete or the radon barrier membrane have been studied to understand how indoor concentration is affected by these issues.
本研究的重点大致是使用文献中的不同参数估计工具来定义氡气产生以及通过土壤和其他材料传输过程中涉及的物理过程。通过应用孔隙率校正系数来考虑土壤湿度和孔隙空间中氡气通过水的传输的影响。创建了一个二维有限元模型，该模型再现了由特定边界条件导致的扩散和对流机制。将该模型与从文献和现场研究中获得的几个解析解和数值解进行比较，验证了该模型。最后，结果表明该模型可以预测氡气通过不同建筑物边界条件的进入情况，例如有无接缝的混凝土板、可变的板厚度和扩散系数，以及使用几种氡气阻隔膜的情况。已经研究了混凝土或氡气阻隔膜中的裂缝，以了解这些问题如何影响室内浓度。
