地下水开采引发的土体变形对污染物迁移影响研究
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摘要
地下水开采引发的土体变形对污染物迁移具有重要影响。结合地下水渗流理论、太沙基一维固结理论和溶质运移对流-弥散理论,建立了变形土体中污染物迁移三维耦合数值模型,考虑了孔隙度、渗透系数和水动力弥散系数随有效应力的动态变化。通过对实际案例进行模拟,分析了地下水开采引发的土体变形对污染物迁移规律的影响。结果表明,地下水位下降,土体有效应力增加,土体骨架压缩变形,使得孔隙度、渗透系数减小,导致水动力弥散系数增幅减小,从而延缓了污染物迁移的对流扩散过程。
The soil mass deformation initiated by groundwater exploitation has major impact on pollutant migration. Combined with groundwater seepage theory,Terzaghi one-dimensional consolidation theory and solute migration convection-dispersion theory have established a pollutant migration three-dimensional coupled numerical model in deformed soil mass,considered dynamic variation of porosity,permeability coefficient and hydrodynamic dispersion coefficient along with the effective stress. Through practical case studies carried out simulation,have analyzed impact from soil mass deformation on pollutant migration initiated by groundwater exploitation.The result has shown that along with groundwater level lowering down,soil mass effective stress increased,and soil mass framework compressively deformed. Thus caused porosity,permeability coefficient,and hydrodynamic dispersion coefficient amplification decreased. Accordingly,postponed pollutant migration convection and dispersion processes.
The soil mass deformation initiated by groundwater exploitation has major impact on pollutant migration. Combined with groundwater seepage theory,Terzaghi one-dimensional consolidation theory and solute migration convection-dispersion theory have established a pollutant migration three-dimensional coupled numerical model in deformed soil mass,considered dynamic variation of porosity,permeability coefficient and hydrodynamic dispersion coefficient along with the effective stress. Through practical case studies carried out simulation,have analyzed impact from soil mass deformation on pollutant migration initiated by groundwater exploitation.The result has shown that along with groundwater level lowering down,soil mass effective stress increased,and soil mass framework compressively deformed. Thus caused porosity,permeability coefficient,and hydrodynamic dispersion coefficient amplification decreased. Accordingly,postponed pollutant migration convection and dispersion processes.
引文
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[2]Catherine A,Peters K H. Multi-component NAPL. Solidification thermodynamics[J]. Transport in porous media,2000,38(1/2):57-77.
[3]Massmann J W. Applying groundwater flow models in vapor extraction system design[J]. Journal of Environmental Engineering,1989,115(l):129~149.
[4]Bear J. Dynamics of Fluids in Porous Media[M]. New York:American Elsevier Publishing Company,1972.
[5]Loroy J J C,Soga K,Savvidou C,Britto A M. Finite element analysis of consolidation and contaminant transport in porous media[C]//Environmental Geomechanics[s. l.]:Balkema,Rotterdam,1996:263-268.
[6]Smith D W. One-dimensional contaminant transport through a deforming porous medium:theory and a solution for a quasi-steady-state problem[J]. International Journal for Numerical and Analytical Methods in Geo-mechanics,2000,24:693-722.
[7] ALSHAWABKEH AKRAM N, RAHBAR NIMA SHEAHAN,THOMAS C,TANG GUOPING. Volume change effects on solute transport in clay under consolidation[C]//Advances in Geotechnical Engineering with Emphasis on Dams,Highway Materials,and Soil Improvement. Geo-Jordan:Geotechnical Pratice Publication,2004,1:105-115.
[8]Lewis T W,Smith D W. Theoretical investigation of the effects of consolidation on contaminant transport through clay barriers[J]. International Journal for Numerical and Analytical Methods in Geomechanics,2009,(3):95-116.
[9]王水林,冯夏庭,葛修润.考虑固结效应的溶质传输研究[J].岩土力学,2004,25(5):681-683.
[10]张志红,李涛,赵成刚,等.考虑土体固结变形的污染物运移模型[J].岩土力学,2008,29(6):1435-1439.
[11]马青山,骆祖江.沧州市地下水允许开采量研究[J].工程勘察,2015,43(4):49-55.
[12]Hague R,Schmedding D W. and Freed V H. Aqueous solubility,adsorption,and vapour behaviour of polychlorinated bipherylarochor 1254[J]. J Environ Sci. Technol.,1974,8(2):139-142.
[13]李伟,骆祖江,王琰,等.地下水渗流与溶质运移三维耦合数值模型[J].勘察科学技术,2013(5):16-21.
[14]郭华,金浩波,骆祖江.基于地面控制的江阴市浅层地下水资源评价[J].地质学刊,2009,33(1):64-69.
[15]陈兴贤,骆祖江,安晓宇,等.深基坑降水三维变参数非稳定渗流与地面沉降耦合模型[J].吉林大学学报(地球科学版),2013,43(5):1572-1578.
[16]王洪涛.多孔介质污染物迁移动力学[M].北京:高等教育出版社,2008.