LNPALs在非饱和土中迁移的离心试验模拟  

Centrifuge modeling of LNAPLs migration in unsaturated soil

作　　者：胡黎明[1] 劳敏慈[2] 濮家骝[1] 殷昆亭[1] 

机构地区：[1]清华大学水利水电工程系,北京100084 [2]香港科技大学土木工程系

出　　处：《岩土工程学报》2002年第6期690-694,共5页Chinese Journal of Geotechnical Engineering

摘　　要：LNAPLs在非饱和土中的迁移规律是环境岩土工程研究的重要课题。利用土工离心机对BTEX在非饱和土中的迁移进行模拟,得到了BTEX长期的运移规律。试验结果表明,LNAPLs迁移与其化学成分和地质水文条件密切相关。BTEX从泄漏点通过非饱和土层向下运移,在地下水位之上形成高浓度区,同时沿地下水面向侧向迁移。BTEX的泄漏和长期迁移会对土壤和地下水造成污染。试验结果为了解LNAPLs污染物迁移规律、污染范围和选取合适的清污技术提供了依据。The transport of LNAPLs in a subsurface system is an important research area in geoenvironmental engineering.In this paper,geotechnical centrifuge technique was used to study BTEX transport in unsaturated soils.Experimental results showed that mechanism of LNAPLs transport was affected by physical properties of each compound and hydrogeological condition of the site.The BTEX from UST moved downwards and formed a pool of free product above the water table,then spread along the ground water surface.Leakage and long term migration of BTEX will pollute soils and ground water.Test results supplies valuable data for studying LNAPLs migration pattern,contamination extent and remedial technique.

关 键 词：环境岩土工程 土工离心模型试验 LNAPLS 非饱和土 污染物 

分 类 号：X505[环境科学与工程—环境工程]