| 摘要: |
| 在微生物诱导CaCO3沉淀技术的基础上，利用Matlab软件建立一维流动注浆模型，在离子层面对模拟注浆的砂柱进行分析和计算，并着重对砂柱后期强度的关键影响因素Ca2+浓度进行追踪，以期从理论方面对注浆效果进行进一步的优化和深入研究.结果表明：注浆模型能够灵活追踪Ca2+浓度随时间的变化，检测砂柱任意位置的Ca2+浓度；钙源为0.75、1.00 mol/L的CaCl2溶液时的注浆效果更优；数值模拟与试验结果吻合较好，可以为利用沙漠砂快速固结形成的高强度材料来建造沙漠公路路基提供有效的参考和依据. |
| 关键词: 沙漠砂 微生物注浆 快速固结 离子追踪 地基加固 |
| DOI：10.3969/j.issn.1007-9629.2022.08.006 |
| 分类号:TU45 |
| 基金项目: |
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| Numerical Analysis of Calcium Ion Tracing in Microbial Grouting of Desert Sand |
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JIAO Chenjiang1, YOU Shuang1, CHENG Xiaohui2, WANG Hongtao1
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1.School of Civil and Resource Engineering， University of Science and Technology Beijing， Beijing 100083， China;2.Department of Civil Engineering， Tsinghua University， Beijing 100084， China
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| Abstract: |
| Based on the existing microbe induced calcium carbonate precipitation technology， a one-dimensional flow grouting model was established by using Matlab. The sand column simulated grouting was analyzed and calculated at the ion level， and the key factor affecting the strength of the sand column was tracked with emphasis on Ca2+ ion. The numerical simulation was carried out with a view to further optimize the grouting effect from the theoretical aspect. The results show that the grouting model can flexibly track the change of Ca2+ ion content over time and simultaneously detect Ca2+ ion content at any position of the sand column. 0.75 mol/L and 1.00 mol/L CaCl2 source perfusion have better effect. Finally， the validity of the numerical simulation is proved by experiment results， which provides an effective reference and basis for the construction of desert highway roadbed by using high strength materials formed by rapid consolidation of desert sand. |
| Key words: desert sand microbial grouting rapid consolidation ion tracking foundation reinforcement |
