BTEX在非饱和土和地下水系统中迁移的试验研究  

Experimental study of BTEX transport in an unsaturated soil and groundwater system

作　　者：胡黎明[1] 郝荣福[1] 殷昆亭[1] 劳敏慈[2] 

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：《清华大学学报（自然科学版）》2003年第11期1546-1549,1553,共5页Journal of Tsinghua University(Science and Technology)

基　　金：国家自然科学基金资助项目(50209006);香港研究资助局资助项目(HKUST6112/99E)

摘　　要：为了解污染物在土壤中迁移的规律,利用BTEX模拟轻非水相污染物质,采用土工离心试验技术对BTEX在非饱和土和地下水系统的迁移过程进行模拟。采用气相色谱分析试验中土样和水样的污染物质量分数,得到了BTEX的时空分布特征和长期迁移规律。试验结果表明,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质量分数区,并沿地下水面侧向迁移,部分溶解的BTEX在水体扩散。地下水的流动对BTEX的迁移有一定影响。The transport of contaminants in soil was modeled experimentally using geotechnical centrifuge modeling to simulate the pollutant transport process in an unsaturated soil and groundwater system with BTEX as the light non-aqueous phase liquid (LNAPL). The concentrations in the soil and groundwater samples were detected by GC analysis to determine the spatio-temporal distribution and migration rules. The experimental results show that the BTEX moves from the leakage point downwards to form a pool of free product above the water table and then spreads along the ground water surface. Some dissolved BTEX diffuses into the groundwater. The groundwater flow affects the BTEX transport somewhat.

关 键 词：环境岩土工程 离心模拟技术 轻非水相流体 非饱和土 地下水系统 迁移 BTEX 汽油类污染物 

分 类 号：P641.2[天文地球—地质矿产勘探] X52[天文地球—地质学]