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针对有机污染场地修复施工过程中出现的冒浆现象,选取2种典型有机污染泥浆,通过多组室内试验,对比分析了4种固化剂的固化稳定效果。结果表明:4种固化剂均有较好的减水效果,典型泥浆Ⅰ的含水率28 d降幅可达45%,而典型泥浆Ⅱ的28 d减水效果以固化剂A(5%水泥)最优,其含水率降幅为37%;固化土样孔隙水电导率EC随龄期先升高后降低,其峰值出现在3 d或7 d;固化土样p H值总体随龄期而增大,且典型泥浆Ⅱ的p H值明显高于典型泥浆Ⅰ;泥浆固化后qu值随龄期发展而快速增长,且典型泥浆Ⅰ强度远高于典型泥浆Ⅱ,并以固化剂A、C固化增强效果最佳,28 d时固化剂C固化的典型泥浆Ⅰ、Ⅱ的qu值分别达到233、48 k Pa;添加固化剂尤其是含凹凸棒土的固化剂B、D能有效降低有机污染物的浸出,其28 d龄期对典型泥浆Ⅰ、Ⅱ的稳定率超过81%。固化泥浆EC、p H值与qu值关系具有明显规律,可反映其强度生长状况。
According to the phenomenon of slurrying during the remediation of organic contaminated sites, two kinds of typical organic-contaminated slurries were selected. The curing stability of four kinds of curing agents was compared and analyzed through a series of laboratory experiments. The results showed that all the four kinds of curing agents had better water reducing effect. The water cut of typical mud Ⅰ decreased by 45% in 28 d, while the 28 d water reducing effect of typical mud Ⅱ was the best with curing agent A (5% cement) , The water content decreased by 37%. The EC of solidified soil increased firstly and then decreased with the increase of age, and the peak appeared at 3 d or 7 d. The p H of cured soil increased with age , And the p H value of typical mud Ⅱ was significantly higher than that of typical mud I. The qu value of mud increased rapidly with the development of age and the intensity of typical mud Ⅰ was much higher than that of typical mud Ⅱ and cured with hardeners A and C The best quaternary value of curing agent C and curing agent Ⅰ and Ⅱ reached 233 and 48 kPa respectively at 28 days. Adding curing agent, especially B and D containing attapulgite clay, can effectively reduce the content of organic pollutants Leaching, the stability of 28-year-old to typical mud Ⅰ, Ⅱ was over 81%. Solidified mud EC, p H value and the qu value relationship has a clear law, can reflect the strength of its growth.