微生物-活性氧化镁固化红黏土试验研究  

Experimental study on microbial-active magnesia solidified red clay

作　　者：吴尚彬 贾苍琴[1,2] 王贵和[1,2] WU Shangbin;JIA Cangqin;WANG Guihe(School of Engineering and Technology,China University of Geosciences(Beijing),Beijing 100083,China;Key Laboratory of Deep GeoDrilling Technology,Ministry of Natural Resources,China University of Geosciences(Beijing),Beijing 100083,China)

机构地区：[1]中国地质大学(北京)工程技术学院,北京100083 [2]中国地质大学(北京)自然资源部深部地质钻探技术重点实验室,北京100083

出　　处：《人民长江》2022年第8期167-172,共6页Yangtze River

基　　金：自然资源部深部地质钻探技术重点实验室(中国地质大学(北京))开放基金资助项目(PY201903)。

摘　　要：采用微生物-活性氧化镁固化技术,进行了不同氧化镁含量、菌液浓度、初始含水率条件下的红黏土无侧限抗压试验、扫描电镜试验和X射线衍射分析,通过无侧限抗压强度、微观特征、化学成分来揭示微生物-活性氧化镁固化红黏土的微观机理,并探究了该技术对红黏土收缩性的控制作用。试验结果表明:红黏土无侧限抗压强度与氧化镁含量、菌液浓度正相关,与初始含水率负相关;试验中生成的水合碳酸镁是无侧限抗压强度提升的关键原因,水合碳酸镁能起到胶连红黏土颗粒、充填红黏土孔隙的作用;微生物-活性氧化镁固化技术可以很好地控制红黏土收缩性。Based on the microbial-active magnesia solidification technology,several tests were conducted on the red clay with different content of magnesia,bacteria concentration and initial water content.Based on unconfined compressive test,scanning electron microscope test and X-ray diffraction test,the micro-mechanism of microbial-active magnesia solidified red clay were explored by analyzing unconfined compressive strength,micro characteristics and chemical composition.The control effect of this technology on the shrinkage of red clay was also explored.The test results showed that the unconfined compressive strength of red clay was positively correlated with the content of magnesia and bacteria concentration,and negatively correlated with the initial water content.The hydrated magnesium carbonate produced in the test was the key reason for the improvement of unconfined compressive strength,and the hydrated magnesium carbonate can glue the red clay particles and fill the pores of the red clay.The microbial-active magnesia solidification technology has a good control effect on the shrinkage property of the red clay.

关 键 词：红黏土 微生物固化技术 活性氧化镁 收缩性 

分 类 号：TU44[建筑科学—岩土工程]