Impact of consolidation pressure on contaminant migration in clay liner
Impact of consolidation pressure on contaminant migration in clay liner
复制标题
固结压力对粘土衬层污染物运移的影响
DOI：
10.3882/j.issn.1674-2370.2013.03.010
复制
发表时间：
2013-07
影响因子：
4
通讯作者：
张志红
中科院分区：
文献类型：
--
作者：
张志红
摘要在简易垃圾场或疏浚排泥场，粘土衬砌在自重作用下会发生固结变形，导致孔隙率降低。然而，污染物在粘土衬里中的迁移受孔隙率的影响。因此，粘土衬砌固结变形对污染物迁移的影响不容忽视。基于Biot固结理论和污染物迁移理论，考虑了对流、扩散和吸附三种迁移机制，建立了变形多孔介质中污染物的一维迁移模型，并采用有限差分法对已建立的初边值问题进行了数值求解。研究了固结压力对污染物运移规律的影响。结果表明，无论采用何种吸附模式，不同的固结压力对污染物的迁移规律都有相似的影响。即在一定的迁移时间内，固结压力越大，污染物的迁移深度越小。随着迁移时间的增加，固结压力的一定增加对污染物浓度随深度变化的影响逐渐增大，随着迁移深度的增加，固结压力一定的增加对污染物浓度随时间变化的影响逐渐增大。
Abstract Consolidation deformation occurs in clay liners under the self-weight of wastes at a simple garbage dump or dredged sediment dump, which leads to a decrease in the porosity. However, the migration of contaminants in clay liners is influenced by the porosity. Thus, the impact of consolidation deformation of clay liners on the migration of contaminants cannot be ignored. Based on Biot's consolidation theory, the contaminant migration theory, and consideration of the three kinds of migration mechanisms of convection, diffusion, and adsorption, a one-dimensional migration model of contaminants in deforming porous media was established, and the finite difference method was adopted to obtain the numerical solutions for an established initial-boundary value problem. The impact of consolidation pressure on the migration law of a contaminant was studied. The results show that, regardless of adsorption modes, different consolidation pressures have similar impacts on the migration law of the contaminant. Namely, over a certain migration time, the greater the consolidation pressure is, the smaller the migration depth of the contaminant. The results also show that, while the migration time increases, the impact of a certain increment of consolidation pressure on the variation of contaminant concentration with the depth increases gradually and, while the migration depth increases, the impact of a certain increment of consolidation pressure on the variation of the contaminant concentration with time increases gradually.
登录
查看更多内容
DOI：
--
发表时间：
2004
期刊：
Advances in Water Science
影响因子：
--
作者：
Nie Yong-feng
通讯作者：
Nie Yong-feng
影响因子：
64.8
作者：
H. Dines
通讯作者：
H. Dines
DOI：
10.1002/nag.219
发表时间：
2002-06-01
影响因子：
4
作者：
Peters, GP;Smith, DW
通讯作者：
Smith, DW
DOI：
10.1061/(asce)1090-0241(2007)133:1(3
发表时间：
2007
影响因子：
3.9
作者：
P. Fox
通讯作者：
P. Fox
影响因子：
5.3
作者：
T. Lewis;P. Pivonka;S. Fityus;David C. Smith
通讯作者：
T. Lewis;P. Pivonka;S. Fityus;David C. Smith