微生物灌浆加固土体研究进展

发布时间：2018-09-14 13:31

【摘要】：水泥和化学浆材是土体加固中最为常用的胶凝材料,但由于存在着高能耗、高污染排放和高成本等缺点而限制了它们的应用。微生物灌浆加固技术是最近发展起来的一种新型的土体加固方法,通过向松散砂土中灌注菌液以及营养盐,利用微生物矿化作用在砂颗粒间快速析出方解石凝胶,改善土体的物理力学性质。系统总结了国内外关于微生物灌浆加固土体的室内及现场试验研究,同时对固化土体的工程特性、原位无损测试方法以及灌浆效果的影响因素等进行了论述。研究表明,微生物灌浆技术具有施工扰动小、灌浆压力低、环境友好等优势,并可显著提高土体的强度、刚度及抗液化性能,在土体加固领域有着非常广阔的应用前景,但关于微生物固化土体的耐久性以及灌浆的经济性等问题仍需进行深入的探讨与研究。
[Abstract]:Cement and chemical paste are the most commonly used cementing materials in soil reinforcement, but their application is limited by the shortcomings of high energy consumption, high pollution discharge and high cost. Microbial grouting reinforcement technology is a new soil reinforcement method developed recently. By pouring bacteria and nutrients into loose sand, calcite gels are precipitated rapidly between sand particles by microbial mineralization. Improve the physical and mechanical properties of soil. This paper systematically summarizes the laboratory and field test research on soil reinforcement by microbial grouting at home and abroad, and discusses the engineering characteristics of solidified soil, the method of in-situ nondestructive testing and the influencing factors of grouting effect. The results show that the microbial grouting technology has the advantages of low disturbance, low grouting pressure, friendly environment, and can significantly improve the strength, stiffness and liquefaction resistance of soil, and has a very broad application prospect in the field of soil reinforcement. However, the durability of microorganism solidified soil and the economy of grouting still need to be deeply discussed and studied.
【作者单位】：东南大学材料科学与工程学院;东南大学绿色建材技术研究所;
【基金】：国家自然科学基金项目(No.51372038)
【分类号】：TU472

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