菌液注射方式对微生物固化砂土动力特性影响试验研究

发布时间：2018-05-10 13:04

  本文选题：微生物固化砂土 + 菌液注射方式　； 参考：《岩土力学》2017年11期

【摘要】：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。
[Abstract]:Microbial solidification technology is a new kind of environmental protection foundation treatment technology in recent years in the field of geotechnical engineering. By injecting bacteria into the soil to be solidified, bacteria hydrolyze urea and introduce calcium source. The formation of calcium carbonate crystals to cement loose soil particles. In the process of microbial solidification, the uniformity of calcium carbonate crystal distribution is one of the hotspots of this technology. This paper attempts to introduce 0.05 mol/L calcium chloride solution (called mixed bacterial solution) into the pure bacteria solution to interfere with the distribution of bacteria artificially. Based on the dynamic triaxial test and scanning electron microscope test, the pure / mixed bacteria solution is compared and analyzed. The effect of mixed bacteria solution and traditional pure bacteria solution on the dynamic characteristics of microorganism solidified sand soil. The results show that the injection of pure / mixed bacteria solution can effectively improve the uniformity of calcium carbonate crystal distribution in microbial solidified sandy soil, and obtain the microorganism solidified sand soil with higher content of calcium carbonate, larger dynamic modulus of elasticity and stronger energy dissipation ability.
【作者单位】： 华中科技大学岩土与地下工程研究所;
【基金】：国家自然科学基金(No.51478201,No.51278216,No.51308241) 中国博士后科学基金(No.2016M600595) 华中科技大学研究生创新创业项目(No.2015650011)~~
【分类号】：TU441
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本文编号：1869417