自源型铁细菌固化玄武岩残积土的室内试验研究  

EXPERIMENTAL RESEARCH ON INDIGENOUS IRON BACTERIA CURING BASALT RESIDUAL SOIL

作　　者：陈彦瑞 雷学文[1] 孟庆山[2] 龚志伟 徐建平[4] CHEN Yanrui LEI Xuewen MENG Qingshan GONG Zhiwei XU Jianping(College of Urban Construction,Wuhan University of Science and Technology,Wuhan 430065, China State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics, Chinese Academy of Sciences,Wuhan 430071, China School of Chemistry and Chemical Engineering,Wuhan University of Science and Technology,Wuhan 430065, China State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081 , China)

机构地区：[1]武汉科技大学城市建设学院,武汉430065 [2]中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,武汉430071 [3]武汉科技大学化学与化工学院,武汉430065 [4]武汉科技大学省部共建耐火材料与冶金国家重点实验室,武汉430081

出　　处：《工业建筑》2017年第9期95-100,共6页Industrial Construction

基　　金：西部交通科技项目(2009318802074)

摘　　要：铁细菌能将二价铁氧化成三价铁生成以氢氧化铁为主的红棕色黏性物。利用铁细菌这一特性在贵州省毕威高速公路沿线赫章县境内的玄武岩残积土中筛选培养自源型铁细菌,对其进行环保固化处理。通过菌种筛选分析、直接剪切试验、X射线荧光光谱分析、扫描电镜、能谱分析等微细观检测方法探究铁细菌固化对玄武岩残积土的影响。结果表明:单细胞呈杆状、整体呈丝状、具有共同鞘套的XT03菌种更适合用于土体的微生物固化;位于地表铁质含量相对较高的红棕色玄武岩残积土铁细菌固化效果明显优于位于地面以下一定深度铁质含量相对较少的黄褐色玄武岩残积土;经铁细菌XT03固化后,在红棕色玄武岩残积土中形成了全面覆盖、无清晰边缘、具有一定脉络、局部有丝状连接物的空间网状胶结体系。Iron can oxidize ferrous iron to ferric iron and produce red iron-based viscous material based on iron hydroxide. The characteristics of iron bacteria were used to screen and cultivate indigenous iron bacteria in the basaltic soil of Hezhang County along the Biwei Expressway in Guizhou Province,and the environmental curing was carried out. The effects of soildification the basalts residual soil for iron bacteria were studied by strain screening analysis,direct shear test and microscopic detection method,such as X-ray fluorescence spectroscopy,scanning electron microscopy and energy spectrum analysis. The results showed that a XT03 strain with single-celled rod shape,filamentous and co-sheath was more suitable for microbial solidification of soil. The hardening effect of iron bacterium on red-brown basalt residual soil located on the surface with relatively high iron content was obviously better than that of yellowish-brown basalt residual soil,which was located in the deeper layer with relatively low iron content. In the red-brown basalt residual soil after the soildified by iron bacteria XT03, a space networked cementation system with full coverage and no clear edge,with some skeleton and local filamentous joints was formed.

关 键 词：玄武岩残积土 微生物固化 自源型铁细菌 力学特性 微细观结构 

分 类 号：TU411[建筑科学—岩土工程]