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微生物注浆固化砂土若干因素的影响机制研究
作者：徐晶，穆柏竹，赵子华
（同济大学 先进土木工程材料教育部重点实验室，上海 201804）
摘要：微生物诱导碳酸钙沉淀（MICP）由于其良好的粘结性和环境友好性，近年来已广泛应用于砂土固化领域。通过测试2种嗜碱性产脲酶菌的生长曲线以及通气和不通气情况下的脲酶活性，探索其与固化砂土的无侧限抗压强度、碳酸钙含量及均匀性之间的联系，并尝试从微观层面探讨微生物注浆固化砂土的主要影响机制。结果表明，通过此方法制得的砂柱强度最高可达586 kPa。脲酶活性差异导致碳酸钙含量差异，碳酸钙含量则与砂土固化强度相关。而在碳酸钙含量相近的情况下，固化均匀性将进一步对强度造成影响。
关键词：微生物固化；脲酶活性；碳酸钙；固化性能
中图分类号：TU472 文献标识码：A 文章编号：1001-702X（2021）01-0035-05
Study on the influential mechanism of several factors on bio-grout consolidation of sandy soil
XU Jing，MU Baizhu，ZHAO Zihua
（Key Laboratory of Advanced Civil Engineering Materials，Ministry of Education，Tongji University，Shanghai 201804，China）
Abstract：Microbial induced carbonate precipitation（MICP） has been widely used in the field of sand solidification in recent years，due to its good cohesiveness and environmental friendliness. In this paper，the growth curves and urease activities of two kinds of basophilic urease producing bacteria under ventilation and without ventilation conditions were tested to explore its relationship with the unconfined compressive strength，calcium carbonate production and homogeneity of solidified sand. This paper also attempts to explore the main impact mechanism of microbial grouting on sand solidification from the micro level. The results show that the maximum strength of the sand column is 586 kPa. The difference of urease activity results in the difference of calcium carbonate content，which is related to the solidification strength of sand. When the content of calcium carbonate is similar，the curing uniformity will further affect the strength.
Key words：microbial curing，urease activity，calcium carbonate，curing properties