论文部分内容阅读
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 bacteria can oxidize ferrous iron into ferric iron to produce ferric hydroxide-based reddish brown sticky substance. The characteristics of iron bacteria were used to screen and culture self-sourced iron bacteria in the basalt residual soil in Hezhang County along the Weiwei Expressway in Guizhou Province. The influence of iron bacteria solidification on the residual basal soil was investigated by strain screening analysis, direct shear test, X-ray fluorescence spectroscopy, scanning electron microscopy and energy spectrum analysis. The results showed that the single cells were rod-shaped and the whole was filamentous. XT03 strains with common sheaths were more suitable for the microbial solidification of soil. The iron-fixing bacteria of reddish brown basalt residual soil with relatively high iron content in the surface Obviously better than the brown basalt residual soil with a relatively low iron content at a certain depth below the ground. After being solidified by the iron bacterium XT03, a complete coverage is formed in the reddish brown basal residual soil with no clear edges and a certain veins Filamentous network of space-shaped cementing system.