注浆管法在微生物诱导碳酸钙沉积加固土体中的应用研究
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摘要
目前,微生物诱导碳酸钙沉积(MICP)在加固土体方面采用最多的方法是分步注浆法,现有的改进方法基本上是顶部注浆、底部注浆、间歇注浆、连续注浆等.通过继续改进分步注浆法,提出了一种新的注浆方法,即向土体中插入带有均匀小孔的注浆管,接着菌液和胶结液通过注浆管小孔自然渗透于土体中,最后形成加固体.通过两个模型槽对比试验,研究MICP技术在三维注浆下进行土体加固的方法,以及该新型注浆方式的可行性及加固效果,并分析了该注浆方法所能加固的影响范围.试验结果表明,经过14 d的处理后,采用这种新的三维MICP注浆方法能形成完整的且强度较高的固化砂柱.在砂柱的最上端试样强度最高,达到1 MPa左右,且随着土体深度的增加,强度越来越低.
At present,the adopting method of microbial induced calcite precipitation(MICP)on soil improvement is two-phase injection mostly. The existing method of two-phase injection is improved,including the injection at the top,the injection at the bottom,intermittent grouting,continuous grouting and so on. This paper continues to improve the two-phase injection,then put forward a new kind of grouting method. That is to say,inserting soil with grouting pipe with holes,adding bacteria fluid and cementing fluid to the grouting pipe respectively,with bacteria fluid and cementing fluid seeping into the soil in the low-pressure through the small hole,the cemented sand column can be formed. In order to study the grouting method of MICP-reinforced soil under three-dimension and the feasibility and reinforcement effect of which,the contrast experiment of two model chambers was conducted. The test results showed that,adopting this new grouting method of MICP-reinforced soil under three-dimension,a full cemented column with high strength was available after 14 days of treating. At the upper of sand column,the strength is up to 1 MPa,and with the increase of soil depth,the strength is getting lower and lower.
At present,the adopting method of microbial induced calcite precipitation(MICP)on soil improvement is two-phase injection mostly. The existing method of two-phase injection is improved,including the injection at the top,the injection at the bottom,intermittent grouting,continuous grouting and so on. This paper continues to improve the two-phase injection,then put forward a new kind of grouting method. That is to say,inserting soil with grouting pipe with holes,adding bacteria fluid and cementing fluid to the grouting pipe respectively,with bacteria fluid and cementing fluid seeping into the soil in the low-pressure through the small hole,the cemented sand column can be formed. In order to study the grouting method of MICP-reinforced soil under three-dimension and the feasibility and reinforcement effect of which,the contrast experiment of two model chambers was conducted. The test results showed that,adopting this new grouting method of MICP-reinforced soil under three-dimension,a full cemented column with high strength was available after 14 days of treating. At the upper of sand column,the strength is up to 1 MPa,and with the increase of soil depth,the strength is getting lower and lower.
引文
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[3]程晓辉,麻强,杨钻,等.微生物灌浆加固液化砂土地基的动力反应研究[J].岩土工程学报,2013,35(8):1486-1495.
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[5]何稼,楚剑,刘汉龙,等.微生物岩土技术的研究进展[J].岩土工程学报,2016,38(4):643-653.
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[10]DE MUYNCK W,DE BELIE N,VERSTRAETE W.Microbial carbonate precipitation in construction materials:a review[J].Ecological Engineering,2010,36(2):118-136.
[11]LU W J,QIAN X,WANG R X.Study on soil solidification based on microbiological precipitation of CaCO3[J].Science China Technological Sciences,2010,53(9):2372-2377.
[12]AL-THAWADI S.High strength in-situ biocementation of soil by calcite precipitating locally isolated ureolytic bacteria[D].Perth,Australia:Murdoch University,2008.
[13]WHIFFIN V S,VAN PAASSEN L A,HARKES M P.Microbial carbonate precipitation as a soil improvement technique[J].Geomicrobiology Journal,2007,24(5):417-423.
[14]CHENG L,CORD-RUWISCH R.In situ soil cementation with ureolytic bacteria by surface percolation[J].Ecological Engineering,2012,42:64-72.
[15]CHENG L,CORD-RUWISCH R,SHAHIN M A.Cementation of sand soil by microbially induced calcite precipitation at various degrees of saturation[J].Canadian Geotechnical Journal,2013,50(1):81-90.
[16]SOON N W,LEE L M,KHUN T C,et al.Improvements in engineering properties of soils through microbial-induced calcite precipitation[J].KSCE Journal of Civil Engineering,2013,17(4):718-728.
[17]ZHAO Q,LI L,LI C,et al.Factors Affecting improvement of engineering properties of micp-treated soil catalyzed by bacteria and urease[J].Journal of Materials in Civil Engineering,2014,26(12):04014094.
[18]VAN PAASSEN L A,HARKES M P,VAN ZWIETEN G A,et al.Scale up of biogrout:a biological ground reinforcement method[C]//Proceedings of the 17th international conference on soil mechanics and geotechnical engineering.Lansdale IOS Press,2009:2328-2333.
[19]BING L I.Geotechnical properties of biocement treated soils[D].Singapore:Nanyang Technological University,2014.
[20]VAN PAASSEN L A,GHOSE R,VAN DER LINDEN T J M,et al.Quantifying biomediated ground improvement by ureolysis:large-scale biogrout experiment[J].Journal of Geotechnical and Geoenvironmental Engineering,2010,136(12):1721-1728.
[2]钱春香,王安辉,王欣.微生物灌浆加固土体研究进展[J].岩土力学,2015,36(6):1537-1548.
[3]程晓辉,麻强,杨钻,等.微生物灌浆加固液化砂土地基的动力反应研究[J].岩土工程学报,2013,35(8):1486-1495.
[4]彭劼,何想,刘志明,等.低温条件下微生物诱导碳酸钙沉积加固土体的试验研究[J].岩土工程学报,2016,38(10):1769-1774.
[5]何稼,楚剑,刘汉龙,等.微生物岩土技术的研究进展[J].岩土工程学报,2016,38(4):643-653.
[6]CASTANIER S,LE METAYER-LEVREL G,PERTHUISOT J P.Ca-carbonates precipitation and limestone genesis-the microbiogeologist point of view[J].Sedimentary Geology,1999,126(1):9-23.
[7]HAMMES F,VERSTRAETE W.Key roles of pH and calcium metabolism in microbial carbonate precipitation[J].Reviews in Environmental Science and Biotechnology,2002,1(1):3-7.
[8]WHIFFIN V S.Microbial CaCO3precipitation for the production of biocement[D].Perth,Australia:Murdoch University,2004.
[9]MORTENSEN B M,HABER M J,DEJONG J T,et al.Effects of environmental factors on microbial induced calcium carbonate precipitation[J].Journal of Applied Microbiology,2011,111(2):338-349.
[10]DE MUYNCK W,DE BELIE N,VERSTRAETE W.Microbial carbonate precipitation in construction materials:a review[J].Ecological Engineering,2010,36(2):118-136.
[11]LU W J,QIAN X,WANG R X.Study on soil solidification based on microbiological precipitation of CaCO3[J].Science China Technological Sciences,2010,53(9):2372-2377.
[12]AL-THAWADI S.High strength in-situ biocementation of soil by calcite precipitating locally isolated ureolytic bacteria[D].Perth,Australia:Murdoch University,2008.
[13]WHIFFIN V S,VAN PAASSEN L A,HARKES M P.Microbial carbonate precipitation as a soil improvement technique[J].Geomicrobiology Journal,2007,24(5):417-423.
[14]CHENG L,CORD-RUWISCH R.In situ soil cementation with ureolytic bacteria by surface percolation[J].Ecological Engineering,2012,42:64-72.
[15]CHENG L,CORD-RUWISCH R,SHAHIN M A.Cementation of sand soil by microbially induced calcite precipitation at various degrees of saturation[J].Canadian Geotechnical Journal,2013,50(1):81-90.
[16]SOON N W,LEE L M,KHUN T C,et al.Improvements in engineering properties of soils through microbial-induced calcite precipitation[J].KSCE Journal of Civil Engineering,2013,17(4):718-728.
[17]ZHAO Q,LI L,LI C,et al.Factors Affecting improvement of engineering properties of micp-treated soil catalyzed by bacteria and urease[J].Journal of Materials in Civil Engineering,2014,26(12):04014094.
[18]VAN PAASSEN L A,HARKES M P,VAN ZWIETEN G A,et al.Scale up of biogrout:a biological ground reinforcement method[C]//Proceedings of the 17th international conference on soil mechanics and geotechnical engineering.Lansdale IOS Press,2009:2328-2333.
[19]BING L I.Geotechnical properties of biocement treated soils[D].Singapore:Nanyang Technological University,2014.
[20]VAN PAASSEN L A,GHOSE R,VAN DER LINDEN T J M,et al.Quantifying biomediated ground improvement by ureolysis:large-scale biogrout experiment[J].Journal of Geotechnical and Geoenvironmental Engineering,2010,136(12):1721-1728.