An analytical solution for contaminant extraction in a radial flow field using PVD-enhanced system
An analytical solution for contaminant extraction in a radial flow field using PVD-enhanced system
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DOI：
10.1680/jgein.15.00029
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发表时间：
2016-02
影响因子：
4.5
通讯作者：
Heng-Yu Wang;Xiaowu Tang;Q. Tang;Yan Wang;P. Gan
中科院分区：
文献类型：
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作者：
Heng-Yu Wang;Xiaowu Tang;Q. Tang;Yan Wang;P. Gan
预制垂直排水板是一种广泛应用的污染细粒土原位修复技术。目前的解析解，考虑无限提取边界是不适合描述的注射PVD（IPVD）和提取PVD（EPVD）之间的短距离。现有解提出的Dirichlet注入边界不能满足质量守恒的要求。基于所提出的简化轴对称模型，给出了解析解。模型中考虑了垂向扩散，初始浓度沿排水沟深度沿着呈指数分布。使用解析解和有限元方法得到的结果之间的良好的一致性验证了所提出的解决方案，并表明，简化模型可以提供一个简单而有效的解决方案，使用PVD增强系统的土壤冲洗过程的预测。该模型与狄利克雷注射…
Prefabricated vertical drains (PVDs) are a widely used in situ remediation technology for contaminated fine-grained soil. The current analytical solution that considers the infinite extraction boundary is not suitable for describing the short distance between the injection PVD (IPVD) and the extraction PVDs (EPVDs). The Dirichlet injection boundary proposed by the existing solution cannot meet the requirements for mass conservation. An analytical solution is developed based on the proposed simplified axisymmetric model. Vertical dispersion is considered in the model, and the initial concentration is exponentially distributed along the depth of the drain. The good agreement between the results obtained using the analytical solution and those obtained using the finite-element method validates the proposed solution and indicates that the simplified model can provide a simple and efficient solution to the prediction of the soil flushing process using a PVD-enhanced system. The model with the Dirichlet injecti...