微生物诱导碳酸钙沉淀影响因素研究进展分析  

Research Progress on Factors of Microbial Induced Calcium Carbonate Precipitation

作　　者：肖海[1,2] 胡欢 吕广柳 张文琪 朱志恩 向瑞 杨悦舒 夏振尧[1,2] 旺杰 XIAO Hai;HU Huan;LYU Guangliu;ZHANG Wenqi;ZHU Zhien;XIANG Rui;YANG Yueshu;XIA Zhenyao;WANG Jie(Key Laboratory of Geological Hazards on Three Gorges Reservoir Area(China Three Gorges Univ.),Ministry of Education,Yichang 443002,China;Engineering Research Center of Eco-Environment in Three Gorges Reservoir Region,Ministry of Education,Yichang 443002,China;Tibet Water Conservancy and Hydropower Planning Survey and Design Institute,Lasa 850000,China)

机构地区：[1]三峡库区地质灾害教育部重点实验室(三峡大学),湖北宜昌443002 [2]三峡库区生态环境教育部工程研究中心,湖北宜昌443002 [3]西藏自治区水利电力规划勘测设计研究院,拉萨850000

出　　处：《三峡大学学报（自然科学版）》2022年第6期66-75,共10页Journal of China Three Gorges University：Natural Sciences

基　　金：国家自然科学基金(U2040207;41807068);土木工程防灾减灾湖北省引智创新示范基地(2021EJD026)。

摘　　要：近年来,微生物诱导碳酸钙沉淀(microbial induced calcite precipitation,MICP)技术由于其对环境友好,无噪音,成本低廉等优点广受关注.MICP技术实质是诱导微生物在土体间隙间生成碳酸钙沉淀,进行胶结与加固土体,从而提高土体的力学强度.但是MICP技术在实际操作中会受到众多影响因素的限制与约束.基于文献资料,系统总结了钙离子源、温度、pH、胶结液浓度、营养液浓度、土颗粒大小、菌液注射方式等关键因素对MICP技术的影响,并阐述了这些影响因素的研究不足之处和未来发展方向.主要得到了以下几点结论:不同的钙源、土颗粒大小以及菌液注射方式会产生不同的处理结果;随着温度以及pH增长,固化效果先升高后减低,不同胶结液浓度以及营养液浓度影响效果不同,会达到一个最适区间;在土体中加入一定量的纤维可以增强土体的力学性能,改良固化效果.从实际应用角度上,MICP技术在加固土体、减少入渗、岩体及文物修复、防风固沙、减少河岸侵蚀、除重金属、混凝土裂纹修复、再生骨料强化等方面有着非常广阔的应用前景,对此技术深入研究具有重要意义.In recent years,microbial induced calcite precipitation(MICP)technology has attracted wide attention due to its advantages of environmental friendliness,noiseless and low cost.The essence of MICP technology is to induce microorganisms to generate calcium carbonate deposits in the soil interstitial spaces to cement and strengthen the soil,so as to improve the mechanical strength of the soil.However,MICP technology is limited and constrained by many factors in practical operation.Based on literatures,the influence of key factors on MICP technology,such as calcium ion source,temperature,pH,concentration of cementing solution,concentration of nutrient solution,soil particle size,and injection mode of bacterial solution are systematically summarized,and the research shortcomings and future development direction of these influencing factors are also described.The main conclusions are as follows.Different calcium sources,soil particles and bacterial liquid injection methods will produce different treatment results.With the increase of temperature and pH,the curing effect increases first and then decreases.Different concentrations of cementing solution and nutrient solution have different effects on the curing effect,which will reach an optimal range.Adding a certain amount of fiber into the soil can enhance the mechanical properties of the soil and improve the curing effects.From the perspective of practical application,MICP technology has a very broad application prospect in strengthening soil,reducing infiltration,restoring rock mass and heritage,preventing wind and fixing sand,reducing bank erosion,restoring concrete crack,and strengthening recycled aggregate.The technology is of great significance to further study.

关 键 词：MICP 微生物固土 纤维 影响因素 

分 类 号：TU432[建筑科学—岩土工程]