Investigation of sub-slab pressure field extension in specified granular fill materials incorporating a sump-based soil depressurisation system for radon mitigation.
Investigation of sub-slab pressure field extension in specified granular fill materials incorporating a sump-based soil depressurisation system for radon mitigation.
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DOI：
10.1016/j.scitotenv.2018.04.401
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发表时间：
2018-10
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影响因子：
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通讯作者：
Le Chi Hung;J. Goggins;Marta Fuente;M. Foley
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文献类型：
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作者：
Le Chi Hung;J. Goggins;Marta Fuente;M. Foley
承载层（颗粒填充材料层）的设计对于具有土壤减压（SD）系统的房屋室内氡缓解非常重要。这些层不仅要满足承载能力和使用标准，而且要为系统提供足够的透气性。以往的研究表明，承压系统的一个关键参数是承载层内底板压力场的扩展，但这一问题尚未得到系统的研究。本文介绍了一系列二维计算流体动力学模拟，研究了在SD系统中开发的板下压力场扩展的行为。本文所考虑的SD系统由粒状填料层和氡池组成。颗粒状填充材料为“T1 Struc”和“T2 Perm”，这是爱尔兰共和国建筑的标准材料。研究了在实际情况中可能遇到的不同情况。结果表明：透气性和颗粒填料厚度是影响底板压力场扩展的两个关键因素；此外，土的透气性是影响SPFE的一个基本因素，因此在设计SD系统时应充分了解它。因此，在每一种实际情况下，都应充分考虑这些因素。最后，通过保证SD系统的气密性，可以显著改善压力场的扩展。
Design of bearing layers (granular fill material layers) is important for a house with a soil depressurisation (SD) system for indoor radon mitigation. These layers should not only satisfy the bearing capacity and serviceability criteria but should also provide a sufficient degree of the air permeability for the system. Previous studies have shown that a critical parameter for a SD system is the sub-slab pressure field extension in the bearing layers, but this issue has not been systematically investigated. A series of two-dimensional computational fluid dynamic simulations that investigate the behaviour of the sub-slab pressure field extension developed in a SD system is presented in this paper. The SD system considered in this paper consists of a granular fill material layer and a radon sump. The granular fill materials are ‘T1 Struc’ and ‘T2 Perm’, which are standard materials for building in the Republic of Ireland. Different conditions, which might be encountered in a practical situation, were examined. The results show that the air permeability and thickness of the granular fill materials are the two key factors which affect the sub slab pressure field extension (SPFE) significantly. Furthermore, the air permeability of native soil is found to be a fundamental factor for the SPFE so that it should be well understood when designing a SD system. Therefore, these factors should be considered sufficiently in each practical situation. Finally, a significant improvement of the pressure field extension can be achieved by ensuring air tightness of the SD system.