本文選題：LNAPL + 裂隙��； 參考：《水利學(xué)報(bào)》2016年07期

【摘要】：巖土體中存在的大孔隙、裂隙等,使其呈現(xiàn)出強(qiáng)烈的非均質(zhì)性。相比均質(zhì)介質(zhì)和不含裂隙的非均質(zhì)介質(zhì),輕非水相流體(Light Non-aqueous Phase Liquids,LNAPLs)會優(yōu)先通過裂隙管道進(jìn)入土壤中,其運(yùn)移規(guī)律更為復(fù)雜,造成的污染更為嚴(yán)重。為此,研究LNAPL在含裂隙基質(zhì)中的運(yùn)移與分布規(guī)律顯得很有必要,研究成果將為裂隙發(fā)育區(qū)域的污染修復(fù)提供理論依據(jù)。本文通過室內(nèi)試驗(yàn)和TOUGH2數(shù)值模型分析了裂隙對LNAPL運(yùn)移及分布的影響。經(jīng)過分析發(fā)現(xiàn),LNAPL注入后,裂隙中的壓強(qiáng)迅速增加,形成以裂隙為核心的、壓強(qiáng)逐漸減小的輻射區(qū);LNAPL優(yōu)先流入裂隙中,以裂隙為核心向四周緩慢擴(kuò)散,形成圈層狀的飽和度逐漸減小的分布區(qū);相同條件下,裂隙越長,同時(shí)刻LNAPL的污染面積越大,LNAPL到達(dá)飽水帶的時(shí)間也越短;裂隙的存在,起到了"快速通道"的作用,使得LNAPL在短時(shí)間內(nèi)滲入土壤中,造成嚴(yán)重的污染。
[Abstract]:The existence of macropores and fissures in rock and soil mass makes them show strong heterogeneity. Compared with homogeneous medium and heterogeneous medium without fissures, Light Non-aqueous Phase liquids (LNAPLs) of light and non-aqueous phase will enter the soil through fissure pipes preferentially, the migration law is more complex and the pollution is more serious. Therefore, it is necessary to study the migration and distribution of LNAPL in fractured matrix, and the research results will provide a theoretical basis for the remediation of pollution in fractured areas. In this paper, the effects of cracks on LNAPL migration and distribution are analyzed by laboratory tests and TOUGH2 numerical model. It is found by analysis that after injection of LNAPL, the pressure in the fracture increases rapidly, forming a radiation zone with a fissure as the core and the pressure decreasing gradually. The LNAPL preferentially flows into the fissure and diffuses slowly around the fissure as the core. Under the same conditions, the longer the fissure, the larger the pollution area of LNAPL at the same time, the shorter the time to reach the saturated zone, and the existence of the fissure acts as a "fast passage". LNAPL seeps into the soil for a short period of time, causing serious pollution.
【作者單位】： 河海大學(xué)地球科學(xué)與工程學(xué)院;
【基金】：江蘇省自然科學(xué)基金項(xiàng)目(BK2012814) 江蘇省青藍(lán)工程項(xiàng)目 江蘇省“六大人才高峰”項(xiàng)目(2014-JY-001)
【分類號】：X523

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本文編號：1848841