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微生物固化技术是近年来岩土工程领域兴起的一种新型环保地基处理技术,该技术通过向待固化土体内注入细菌,利用细菌水解尿素,并在引入钙源的条件下,诱导产生碳酸钙晶体以胶结松散土颗粒。在微生物固化过程中,碳酸钙晶体分布的均匀性是目前该技术研究的热点之一。文中尝试通过在纯菌液中引入0.05 mol/L氯化钙溶液(称为混合菌液)对细菌分布进行人为干预,并基于动三轴试验及扫描电镜测试,对比分析了纯/混菌液、混合菌液及传统纯菌液等注射方式对微生物固化砂土动力特性的影响。试验结果表明:纯/混菌液注射方式能有效提高微生物固化砂土中碳酸钙晶体分布的均匀性,从而获得碳酸钙含量较高、动弹性模量较大及耗能能力较强的微生物固化砂土。
Microbial solidification technology is a new type of environmental protection foundation treatment technology emerging in the field of geotechnical engineering in recent years. By injecting bacteria into soil to be solidified, bacteria are used to hydrolyze urea, and calcium carbonate crystals are induced under the condition of introducing calcium source To cement loose loam particles. In the process of microbial solidification, the uniformity of crystal distribution of calcium carbonate is one of the hot spots in the research of this technology. In this paper, we attempted to intervene the bacterial distribution by introducing 0.05 mol / L calcium chloride solution (called mixed bacteria solution) into the pure liquid and based on the dynamic triaxial test and the scanning electron microscope test, the pure / mixed liquid , Mixed bacteria and traditional pure liquid injection method on the dynamic characteristics of microbial solidified sand. The results showed that the injection of pure / mixed liquid can effectively improve the uniformity of calcium carbonate crystal distribution in the soil cured by microorganisms, so as to obtain the solidification of microorganisms with high calcium carbonate content, high dynamic elastic modulus and strong energy dissipation capacity sand.