微生物改善土体性能研究进展

Research progress in microorganism improving soil properties

摘要:

土体中除含固体颗粒、液体与气体以外，还存在细菌、真菌等微生物，其存在势必会对土体性能产生一定作用。现有研究表明：微生物改善土体性能的机理是通过改变微观结构作用土体性能，主要有微生物吸附、诱导无机物沉淀、生物表面活性剂附着与气体填充等四种方式。微生物作用土体的宏观表现主要有降低渗透性与提高强度两方面。除理论分析与试验研究取得了一定成果外，微生物在土体封堵防渗与胶结加固工程上也得到了很好应用。

Abstract:

Soil properties depend not only on solid particle, liquid and gas in soil, but also on bacteria and fungus in soil. The mechanism of microorganism improving soil properties is that microorganism can change microstructure of soil by microorganism adsorption, inducing inorganic matter precipitation, bio-surfactant attachment and gas tamponade. Macro-performances of microorganism improving soil properties are mainly permeability reduction and strength improvement. Besides some achievements of theoretical analysis and experimental research on microorganism improving soil properties have been made, microorganism has also been applied well in some projects of sealing diaphragm and cementing reinforcement.