LNAPL在含裂隙层状非均质地层中运移模拟研究  

A simulation study of LNAPL migration in layered heterogeneous porous media containing fractures

作　　者：肖岳峰[1] 王锦国[1] 黄倩[1] 赵科锋[1] XIAO Yuefeng WANG Jinguo HUANG Qian ZHAO Kefeng(School of Earth Science and Engineering, Hohai University, Nanjing, Jiangsu 211100, China)

机构地区：[1]河海大学地球科学与工程学院,江苏南京211100

出　　处：《水文地质工程地质》2017年第1期23-30,共8页Hydrogeology & Engineering Geology

基　　金：江苏省"六大人才高峰"高层次人才项目(2014-JY-001)

摘　　要：为研究轻非水相流体(LNAPL)泄露后在土壤中扩散情况,基于室内试验,使用TOUGH2软件进行数值模拟,分析探讨含裂隙层状非均质地层中LNAPL的运移及分布情况。并对LNAPL入渗过程及停止入渗并静置一定时间后,不同粒径砂层及裂隙中LNAPL的分布特征及残留含量进行对比研究。在LNAPL泄露入土壤后,优先进入土壤中的裂隙,形成快速通道,使LNAPL的扩散方式不局限于自上而下逐层渗入,同时也从裂隙中向两侧水平扩散,加快了LNAPL扩散入地层中的速度;停止入渗并静置一定时间后,包气带细砂中的LNAPL饱和度大于粗砂中的饱和度,而饱水带中两种砂土中的LNAPL饱和度相差较小。In order to investigate the diffusion of light non aqueous phase liquid （LNAPL） after leaking in soil, and based on the laboratory test, TOUGH2 is used in this article for numerical simulation to analyze and discuss the migration and distribution of LNAPL in layered heterogeneous porous media containing fractures. Comparison tests are conducted for the distribution characteristics and the residual contents of LNAPL in sand layers of different particle sizes in both infiltration process and standing culture after infiltration for a while. After leaking, the LNAPL priority infiltrates into fractures and forms a fast-track, so the LNAPL can horizontally diffuse to both sides from fractures and will not be limited to diffuse only from top to down. The LNAPL infiltration rate is accelerated. After the process of standing, the saturation of LNAPL in the fine sand is higher than in coarse sand in the unsaturated zone, and the saturation of soybean oil in both kinds of sands are almost in the same level in the saturated zone.

关 键 词：非均质 LNAPL 裂隙 

分 类 号：P641.2[天文地球—地质矿产勘探]