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用MICP修改的沙子中凝固模式的识别和提取:在孔径尺度上的新见解

Baoquan Wang¹, Liang Guo¹, Xuanli Luo¹

¹School of Geoscience and Technology, Southwest Petroleum University, Xindu, Chengdu, 610500, Sichuan, China.

|March 21, 2024

概括

微生物诱导的碳酸沉 (MICP) 在土壤中产生生物凝固模式. G-C-G模式显示出优异的孔隙填充和透性抵抗,为有效的土壤生物凝固提供了洞察力.

科学领域:

地质技术工程地质技术工程
环境科学环境科学
微生物学微生物学

背景情况:

微生物诱导的碳酸沉 (MICP) 是一种可持续的技术,用于增强土壤特性.
通过MICP进行生物水泥化,可以提高土壤对透性和流动的抵抗力.
了解孔尺度生物凝固模式对于优化MICP应用至关重要.

研究的目的:

用MICP处理的河流沙子中识别和描述生物凝固模式.
量化评估不同生物凝固模式的孔隙填充和密封效果.
为了验证2D显微镜分析和3D计算机断层扫描 (CT) 扫描之间的发现.

主要方法:

河沙样本经历了24个MICP生物处理周期.
堆叠图像的二维显微镜分析被用于观察生物凝固模式.
从CT扫描数据的3D体积重建提供了补充分析.
进行了代表元素体积 (REV) 分析,以确保结果的可靠性.

主要成果:

确定了三个不同的生物凝固模式:G-C-G,G-C和G-G.
G-C-G图案呈现出最高的孔隙填充比率 (2D 81.2%,3D 77.257%) 和最佳的透性阻力 (68.5%的密封率).
G-C和G-G模式显示出明显较低的孔隙填充比率和密封效率.

结论:

具有多颗粒封装和桥梁的G-C-G模式是最有效的生物凝固和透性抵抗.
MICP的有效性高度依赖于由此产生的孔尺度凝固模式.
这项研究为优化土壤改善技术提供了对孔尺度生物水泥化模式的基础见解.

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