摘要
利用微生物诱导碳酸钙沉淀(MICP)技术加固土体近年来越来越受到研究者的关注,但关于温度、颗粒粒径和浓度等因素对MICP固化土壤的影响的相关研究规律总结尚不充分.为了进一步提高MICP技术固化土体的效率,从对各种影响因素的试验研究出发,总结了3种影响因素在微生物固化土体反应进程中的相关结论.发现提高菌液浓度能增大碳酸钙产量,而浓度过高会抑制脲酶活性,对固化效果产生反作用;应用MICP技术的温度为30℃时,菌液活性与碳酸钙产量等方面达到最佳;选用颗粒级配良好的土体试样能较大程度提高改良土体的强度,加固效果更好,有效粒径范围为10~1 000μm,但颗粒级配的影响程度研究尚不够深入,需要进一步加以研究.
The soil reinforcement technique by the Microbial Induced CaCO 3 Precipitation(MICP)has increasingly attracted attention in recent years.However,the relevant research laws on the effects of factors such as temperature,grain size,and concentration on the MICP are not sufficiently summarized.To further study and enhance the efficiency of MICP technology to solidify soil,the study summarizes several important conclusions drawn in the reaction progress of microbial solidified soil based on experimental research on various influencing factors.The researches indicate that increasing the concentration of bacterial liquid can build up the yield of calcium carbonate,while the excessive concentration of calcium ions will inhibit urease activity and have a counter-effect on the curing effect.When the temperature of the MICP technology is at about 30℃,the activity of the bacterial liquid and the yield and morphology of calcium carbonate are the best.The selection of soil specimens with good grain composition can greatly enhance the strength of the improved soil and the reinforcement effect is better,and the effective particle size range is 10~1000μm,but the study on the influence of the grain composition is not deep enough so that such influence needs to be further studied.
作者
赵蒙
邓瑞
谭博仁
张旭
杨美林
ZHAO Meng;DENG Rui;TAN Boren;ZHANG Xu;YANG Meilin(School of Architecture and Civil Engineering,Chengdu University,Chengdu 610106,China)
出处
《成都大学学报（自然科学版）》
2023年第3期307-311,共5页
Journal of Chengdu University（Natural Science Edition）
基金
2022年大学生创新创业训练国家级项目(202211079015)。
关键词
浓度
温度
颗粒粒径
MICP
concentration
temperature
grain size
MICP
