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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。
In the civil engineering and water conservancy project hidden dangers and engineering on the environment caused by the adverse effects, a considerable part of the leakage problems. Recent studies of microbial plugging techniques have shown that providing suitable nutrients to microbes in geotechnics can produce effective microbial causation in a relatively short period of time. Two sand columns with seepage holes were tested for their microbial entrapment. Two sand columns were filled with potato and glucose solutions, respectively, and compared with sand columns through which water flowed. The sand column with potato juice is added to reduce the water permeability to 1 / 50th of the original within 3 weeks when the nutrient solution is sufficient, and the occlusion occurs at the leak site. Sand column added with glucose solution, water permeability did not change significantly. Add a solution of glucose sand column to add the potato liquid, the leak is blocked. The method of increasing the head was used to test the stability of the plugging. During the process of increasing the hydraulic gradient of the seepage system from 0.267 to 1.067, the plugging eventually failed. Experiments show that the microorganism-induced sealing technology in sand can combine the seepage and sealing of the seepage source, and remain stable when the water head of the water inlet becomes larger.