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| 正丁基硫代磷酰三胺对微生物固化砂土力学特性影响研究 |
| Effects of N-(n-butyl) thiphosphorothioate triamine on the Mechanical Properties of Microbially Cured Sandy Soils |
| 投稿时间：2024-03-19 修订日期：2024-03-25 |
| DOI： |
| 中文关键词: 微生物技术 脲酶抑制剂 三轴试验 扫描电子显微镜 |
| 英文关键词:Microbiotechnology Urease inhibitors: triaxial test Scanning electron microscope |
| 基金项目:水利部土石坝破坏机理与防控技术重点实验室开放(YK319008) |
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| 中文摘要: |
| 通过分析微生物加固标准砂试样的力学性质指标及碳酸钙含量评价正丁基硫代磷酰三胺 (N-(n-butyl) thiphosphorothioate triamine,NBPT)对微生物诱导碳酸钙沉淀 (Microbially I-nduced Carbonate Precipitation,MICP) 加固砂土效果影响，分析固化试样微观结构特征揭示NBPT对MICP加固砂土的作用机制，结果表明：微生物加固标准砂试样的应力应变曲线均呈现为应力软化型，引入NBPT的试样微生物诱导产生的碳酸钙晶体更多、分布更均匀胶结土颗粒和充填孔隙，宏观上表现为砂样更密实、更难被压缩，力学性能更好。NBPT会影响MICP诱导生成的碳酸钙晶体大小和形态，使得反应初期生成少量且尺寸较小的碳酸钙，避免了大量生成的碳酸钙堵塞渗流路径，后续胶结液得以顺畅灌入，胶结液得到充分利用，在反应后期能够生成更多的碳酸钙且均匀地填充砂样內部孔隙，使得土体更加密实，有效地提高了MICP技术加固土体的效果。 |
| 英文摘要: |
| s: Through analyzing the mechanical property indexes and calcium carbonate content of microbiologically reinforced standard sand specimens to evaluate the effect of NBPT on MICP-reinforced sandy soils, and analyzing the microstructural characteristics of the cured specimens to reveal the mechanism of NBPT"s action on MICP-reinforced sandy soils. The results showed that the stress-strain curves of microbial reinforced standard sand samples were all of the stress-softening type, NBPT was introduced into the sample microorganisms induced to produce more calcium carbonate crystals, more uniform distribution of cemented soil particles and pore filling, macroscopically manifested as a denser sand sample, more difficult to be compressed, with a better mechanical properties. NBPT affects the size and morphology of calcium carbonate crystals induced by MICP, so that a small amount of small-sized calcium carbonate is generated at the early stage of the reaction, which avoids a large amount of generated calcium carbonate blocking the seepage paths, and the subsequent cement can be smoothly infused, and the cement can be fully utilized, and at the late stage of the reaction, a large amount of calcium carbonate can be generated. The subsequent cement can be infiltrated smoothly , the cement can be fully utilized and more calcium carbonate can be generated in the later stage of the reaction to fill the internal pores of the sand samples uniformly, which makes the soil denser and effectively improves the effect of soil reinforcement by MICP technology. |
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