王子文,魏然,蔡红,肖建章,吴帅峰.营养液浓度和微生物活性对MICP固化淤泥质土强度的影响[J].中国水利水电科学研究院学报,2020,18(6):486-493
营养液浓度和微生物活性对MICP固化淤泥质土强度的影响
Effect of nutrient solution concentration and microbial activity on MICP solidified strength of soft clay
投稿时间:2019-12-26  
DOI:10.13244/j.cnki.jiwhr.20190225
中文关键词:  MICP  淤泥质土  固化  强度
英文关键词:MICP  soft clay  solidification  strength
基金项目:中国电建股份科技项目(DJ-ZDXM-2015-12);中国水科院基本科研项目(GE0145B512016)
作者单位
王子文 中国水利水电科学研究院 流域水循环模拟与调控国家重点试验室, 北京 100048 
魏然 中国水利水电科学研究院 流域水循环模拟与调控国家重点试验室, 北京 100048 
蔡红 中国水利水电科学研究院 流域水循环模拟与调控国家重点试验室, 北京 100048 
肖建章 中国水利水电科学研究院 流域水循环模拟与调控国家重点试验室, 北京 100048 
吴帅峰 中国水利水电科学研究院 流域水循环模拟与调控国家重点试验室, 北京 100048 
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中文摘要:
      用微生物成因碳酸钙良好胶结能力来改善砂土性质得到了越来越多的关注,由于淤泥质土特殊的化学组成及工程性质,对于微生物法用于淤泥质土的固化人们还知之甚少。本文基于MICP技术,考虑不同营养液浓度、不同微生物浓度和脲酶活性等多种工况,对低渗透性的固化淤泥质土开展了系统的抗剪强度分析,深入探讨了微生物固化淤泥质土的抗剪强度影响因素。结果表明:选用高酶活微生物来固化淤泥质土,固化后抗剪强度有明显提高,与未固化淤泥质土相比,内摩擦角提高3.96~5.52倍,抗剪强度在养护初期就有较快提高;随着营养液浓度不断增加,内摩擦角表现为先增大后减小,最大可达28.10°;采用拌合法更适用于MICP固化淤泥质土。
英文摘要:
      The microbial induced calcium carbonate deposition (MICP) technology of biomineralization has the characteristics of small energy consumption, with great variety, rich resources and friendly environment. More and more attention has been paid to improving the properties of sandy soil by using the good cementa-tion ability of microbial calcium carbonate. Due to the special chemical composition and soil mechanical properties of soft clay,microbial methods in the solidification of soft clay are still poorly understood. Based on MICP technology, considering different nutrient solution concentration, microbial concentration and ure-ase activity, this paper carried out a systematic shear strength analysis of low permeability solidified soft clay,and further discussed the affecting factors of shear strength. The results show that the high enzyme ac-tive microorganism should be selected as far as possible to solidify the soft clay. After curing, the shear strength of the MICP solidified soft clay are improved significantly, and compared with the uncured sam-ples, the internal friction angle increases by 3.96-5.52 times and the shear strength increases rapidly in the early stage of curing. With the increasing concentration of nutrient solution, the internal friction angle increases first and then decreases up to 28.10°。The mixing method is more suitable for the soft clay by MICP.
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