摘要
土木水利工程中的安全隐患与工程对环境造成的不良影响中,相当一部分与渗漏问题有关。微生物封堵技术的最新研究表明,为岩土中微生物提供合适的营养物质,可以在相对较短时间内产生有效的微生物成因封堵。对带有渗漏孔的2个砂柱进行微生物诱导封堵试验,2个砂柱中分别添加马铃薯液和葡萄糖溶液,并与通水的砂柱作对比。添加马铃薯液的砂柱,在营养液充足的情况下3周内透水能力降低到原来的1/50,而且封堵发生在渗漏处。添加葡萄糖溶液的砂柱,透水能力未明显改变。添加葡萄糖溶液的砂柱改添马铃薯液后,渗漏处同样被封堵。采用加大水头的方法测试了封堵稳定程度,在渗流系统的水力坡降由0.267加大到1.067的过程中,封堵最终失效。试验表明,砂土中微生物诱导封堵技术能够将渗漏源探查和封堵合二为一,且在入水口水头变大的情况下仍能保持稳定。
Many problems of latent danger and environmental impact of infrastructure are due to leakage .The latest research of microbially-induced clogging shows that , suitable survival conditions for microorganisms lead to an effective microbial clogging in a relative short time , to reach the aim of decreasing hydraulic conductivity in soils .In this study, tests of microbial-induced clogging were performed in 2 sand columns, where potato soup and glucose were added, and water was added to another column only for a control .The hydraulic conductivity of the sand column supplied with potato soup decreased to 1/50 of its initial discharge in 3 weeks , and clogging occurred near the leak . The hydraulic conductivity of the sand column supplied with glucose did not change a lot .Then, potato soup was added to the sand column initially served with glucose , and clogging happened near its leak .Clogging stability was tested by increasing water head .The water gradient in the test system was increased from 0.267 to 1.067, and the clogging reached a failure gradually .Tests showed microbial-induced clogging in sands was a combination of leakage detection and leakage sealing , which was stable in the case of increasing the water head of the inlet .
出处
《工业建筑》
CSCD
北大核心
2015年第1期139-142,共4页
Industrial Construction
基金
国家自然科学基金资助项目(50908122
51078202)
关键词
砂土
微生物诱导
封堵
sands
microbial-induced
clogging
