为了探究土壤原生细菌对红黏土强度的影响,通过对红黏土中天然赋存的原生细菌进行富集培养,并在红黏土重塑试样中添加培养后的细菌菌液,通过土工试验和电镜试验分析红黏土物理力学性质和微观结构的变化。结果表明:随着细菌的掺入,三轴试样的破坏峰值和压缩模量都有所提高,并且随时间的增长,呈现先增大后减小的趋势;同时从电镜图像上来看,细菌的掺入使得红黏土中粉粒含量有所增加,相应的黏粒含量下降。研究结果可为进一步研究单一的细菌种类对红黏土物理力学性质和微观结构的影响提供参考。
Abstract
In this study we aimed to investigate the influence of native bacteria on the strength of red clay. We cultivated the native bacteria in red clay and added this enrichment cultivated bacteria solution into remoulded red clay specimens. Through geotechnical test and electron microscopy test we examined the changes in physical and mechanical properties and microstructure of red clay. Results concluded that with the adding of bacteria, peak strength at failure and modulus of compression both increased with time and then declined. Meanwhile, SEM images showed that bacteria augmented the silty particle content in red clay, while reduced the clayey content. The research findings offer reference for further researching the influence of single bacteria on the physical and mechanical properties and microstructure of red clay.
关键词
红黏土 /
原生细菌 /
胶结作用 /
抗剪强度 /
土工试验 /
电镜试验
Key words
red clay /
native bacteria /
cementation /
shear strength /
geotechnical test /
electron microscopy test
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参考文献
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基金
贵州省地质灾害监测预警与决策支持平台建设项目(Z113278);贵州省科学技术基金项目(黔科合J字[2015]2033);贵州省水利厅科技专项经费项目(KT201804)
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