摘要
土体受到有机氯农药污染后,其工程性质会发生改变,农药成分也会给周围环境带来严重危害,尤其是持久性有机污染成分的危害更大。国内外对农药污染土体的研究主要关注场地修复技术,对其工程特性评价的研究鲜有报道。本文通过室内配制不同浓度的有机氯农药污染土样,在养护龄期为1d、7d、28d、56d、90d时,分别进行了无侧限抗压强度试验、渗透试验、扫描电镜试验(SEM),分析了污染土体抗压强度、渗透系数、微观结构的变化规律,并采用微观解释宏观规律。试验结果表明,有机氯农药污染后的土体强度随农药浓度的增加而减小,随龄期增长呈先增大后减小的趋势,56d龄期时的抗压强度最大;渗透系数随农药浓度的增大而减小,随龄期的增加而增大;土体微观结构表现为随农药浓度增大絮状结构增多,从而很好地解释了宏观力学特性变化规律。
Engineering properties of soil will change after contaminated by organochlorine pesticides,the pesticides also bring risk to the environment,especially the organic pollutants in composition of persistent are even more dangerous. Recently,the research about pesticides contaminated soil mainly focused on the remediation of the site,seldom about its engineering properties. In this paper,organochlorine pesticide contaminated soils with different pesticide concentrations were made,unconfined compression strength（ UCS）,permeability test,scanning electron microscopy（ SEM） were done for the soil at curing time of 1 day,7 days,28 days,56 days and 90 days. The test results show that UCS of organochlorine pesticide contaminated soil decrease with the increase of pesticide concentration,UCS first increases then decreases with the increase of curing time,and at the time of 56 days reaches its peak;the permeability coefficient of the contaminated soil decreases with the increase of pesticide concentration,increases with longer curing time; the flocculent structure of contaminated soil increases with the increase of pesticide concentration,which is also in accordance with the change of strength properties.
出处
《地下空间与工程学报》
CSCD
北大核心
2014年第6期1317-1323,共7页
Chinese Journal of Underground Space and Engineering
基金
国家自然科学基金重点项目(41330641)
国家自然科学基金项目(41202203)
国家科技支撑计划项目(2012BAJ01B02)
全国优秀博士学位论文作者专项资金资助项目(201353)
教育部新世纪优秀人才支持计划(NCET-13-0118)
中央高校基本科研业务费(2242013R30014)
