School of Engineering, Brown University, Providence, RI 02912, USA.
J Hazard Mater. 2012 Sep 15;231-232:10-7. doi: 10.1016/j.jhazmat.2012.06.016. Epub 2012 Jun 16.
This study is concerned with developing a method to estimate subslab perimeter crack contaminant concentration for structures built atop a vapor source. A simple alternative to the widely-used but restrictive one-dimensional (1-D) screening models is presented and justified by comparing to predictions from a three-dimensional (3-D) CFD model. A series of simulations were prepared for steady-state transport of a non-biodegradable contaminant in homogenous soil for different structure construction features and site characteristics. The results showed that subslab concentration does not strongly depend on the soil diffusivity, indoor air pressure, or foundation footprint size. It is determined by the geometry of the domain, represented by a characteristic length which is the ratio of foundation depth to source depth. An extension of this analytical approximation was developed for multi-layer soil cases.
本研究旨在开发一种方法，用于估算建在蒸汽源上方的结构中次板坯周边裂缝污染物浓度。通过与三维 (3-D) CFD 模型的预测进行比较，提出了一种简单的替代方法，替代了广泛使用但具有局限性的一维 (1-D) 筛选模型，并证明了其合理性。针对不同的结构施工特点和场地特征，对非生物降解污染物在均质土壤中的稳态传输进行了一系列模拟。结果表明，次板坯浓度与土壤扩散系数、室内空气压力或基础占地面积无关，而是由以基础深度与源深度之比表示的特征长度决定的域的几何形状决定的。针对多层土壤情况，对该分析近似进行了扩展。
