砂土中混凝土裂缝的微生物封堵试验研究
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摘要
微生物封堵技术研究表明可以通过向岩土中微生物提供营养物质从而在较短时间形成封堵。该文对砂土中混凝土裂缝利用微生物封堵法进行试验,设置两个试验组灌入不同的营养物质,分别记录试验过程中的环境温度和湿度,对流出液的pH值、电导率、氧化还原电位、OD600及不同种类微生物数量变化进行了检测。结果表明:在灌入不同营养物质25d后,试块均发生较明显的封堵现象,单位时间内的流量有了显著降低,其中一个灌注马铃薯提取物的试验模型由平均85mL/h下降至0.5mL/h,另一个灌注加铁的马铃薯提取物的试验模型由平均70mL/h下降至0.3mL/h。研究结果证实了微生物代谢在砂土中混凝土裂缝封堵过程中发挥了重要作用。
Studies on microbial clogging techniques have shown that the provision of sufficient suitable nutrients for the microorganisms in geotechnical soils can produce effective microbial clogging in relatively short periods of time.This study applied various nutrients to two sand columns each with a cracked concrete slab.The tests recorded the ambient temperature and humidity,the pH,electrical conductivity,redox potential,OD600 and the number of different microorganisms.Blocking occurred after various nutrients had been supplied for 25 days.The flow per unit time was significantly reduced with one test slab with potato exact dropping from an average of 85 mL/h to 0.5 mL/h and the other test slab with potatoexact and Fe dropping from an average of 70 mL/h to 0.3 mL/h.The tests show that microbial metabolism plays an important role in concrete crack sealing in sand.
Studies on microbial clogging techniques have shown that the provision of sufficient suitable nutrients for the microorganisms in geotechnical soils can produce effective microbial clogging in relatively short periods of time.This study applied various nutrients to two sand columns each with a cracked concrete slab.The tests recorded the ambient temperature and humidity,the pH,electrical conductivity,redox potential,OD600 and the number of different microorganisms.Blocking occurred after various nutrients had been supplied for 25 days.The flow per unit time was significantly reduced with one test slab with potato exact dropping from an average of 85 mL/h to 0.5 mL/h and the other test slab with potatoexact and Fe dropping from an average of 70 mL/h to 0.3 mL/h.The tests show that microbial metabolism plays an important role in concrete crack sealing in sand.
引文
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[11]中华人民共和国住房和城乡建设部.地下防水工程质量验收规范:GB 50208-2011[S].北京:中国建筑工业出版社,2011.Ministry of Housing and Urban-Rural Development of the People's Republic of China.Code for acceptance of construction quality of underground waterproof:GB 50208-2011[S].Beijing:China Architecture&Building Press,2011.(in Chinese)
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[14]FRANCISCA F M,GLATSTEIN D A.Long term hydraulic conductivity of compacted soils permeated with landfill leachate[J].Applied Clay Science,2010,49(3):187-193.
[2]GUO H X,CHENG X H,LI M.Experimental analysis of bio-stimulated sealing process in environmental geotechnical engineering[J].Science China Technological Sciences,2013,56(3):732-738.
[3]MITCHELL J K,SANTAMARINA J C.Biological considerations in geotechnical engineering[J].Journal of Geotechnical and Geoenvironmental Engineering,2005,131(10):1222-1233.
[4]UMAR M,KASSIM K A,PING CHIET K T.Biological process of soil improvement in civil engineering:A review[J].Journal of Rock Mechanics and Geotechnical Engineering,2016,8(5):767-774.
[5]LESLEY K,KENT N,JULIANA R.Biostimulation of groundwater microorganisms in fractured bedrock through nutrient addition:A field trial[C]//Proceedings of 1st International Conference on BGCE.Delft,Netherlands:Delft University of Technology,2008:67-75.
[6]张越,郭红仙,程晓辉,等.微生物诱导碳酸钙沉积技术治理某地下室渗漏的现场试验[J].工业建筑,2013,43(12):138-143.ZHANG Y,GUO H X,CHENG X H,et al.Field experiment of microbial induced carbonate precipitation technology in leakage treatment of a basement[J].Industrial Construction,2013,43(12):138-143.(in Chinese)
[7]李萌,郭红仙,程晓辉,等.自源型微生物在地基渗漏封堵过程中的群落变化分析[J].工业建筑,2015,45(7):13-18.LI M,GUO H X,CHENG X H,et al.Analysis of the changes of microbial communities in process of biosealing grounds[J].Industrial Construction,2015,45(7):13-18.(in Chinese)
[8]IVANOV V,CHU J.Applications of microorganisms to geotechnical engineering for bioclogging and biocementation of soil in situ[J].Reviews in Environmental Science and Bio/Technology,2008,7(2):139-153.
[9]张贺超,郭红仙,李萌,等.砂土介质中微生物诱导封堵试验研究[J].工业建筑,2015,45(1):139-142.ZHANG H C,GUO H X,LI M,et al.Experimental research of microbial-induced clogging in sands[J].Industrial Construction,2015,45(1):139-142.(in Chinese)
[10]SEIFERT D,ENGESGAARD P.Sand box experiments with bioclogging of porous media:Hydraulic conductivity reductions[J].Journal of Contaminant Hydrology,2012,136-137:1-9.
[11]中华人民共和国住房和城乡建设部.地下防水工程质量验收规范:GB 50208-2011[S].北京:中国建筑工业出版社,2011.Ministry of Housing and Urban-Rural Development of the People's Republic of China.Code for acceptance of construction quality of underground waterproof:GB 50208-2011[S].Beijing:China Architecture&Building Press,2011.(in Chinese)
[12]THULLNER M.Comparison of bioclogging effects in saturated porous media within one-and two-dimensional flow systems[J].Ecological Engineering,2010,36(2):176-196.
[13]ACHAL V,MUKHERJEE A.A review of microbial precipitation for sustainable construction[J].Construction and Building Materials,2015,93:1224-1235.
[14]FRANCISCA F M,GLATSTEIN D A.Long term hydraulic conductivity of compacted soils permeated with landfill leachate[J].Applied Clay Science,2010,49(3):187-193.