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1.河海大学土木与交通学院,江苏 南京 210098
2.苏交科集团股份有限公司,江苏 南京 210000
Received:23 April 2025,
Revised:2025-09-27,
Published:28 April 2026
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郭子豪,白兰兰,张丽瑶等.羧甲基纤维素钠改进MICP固化效果的试验研究[J].防灾减灾工程学报,2026,46(02):454-466.
GUO Zihao,BAI Lanlan,ZHANG Liyao,et al.Experimental Study on Improvement of MICP Reinforcement Effect by Sodium Carboxymethyl Cellulose[J].Journal of Disaster Prevention and Mitigation Engineering,2026,46(02):454-466.
郭子豪,白兰兰,张丽瑶等.羧甲基纤维素钠改进MICP固化效果的试验研究[J].防灾减灾工程学报,2026,46(02):454-466. DOI: 10.13409/j.cnki.jdpme.20250423001.
GUO Zihao,BAI Lanlan,ZHANG Liyao,et al.Experimental Study on Improvement of MICP Reinforcement Effect by Sodium Carboxymethyl Cellulose[J].Journal of Disaster Prevention and Mitigation Engineering,2026,46(02):454-466. DOI: 10.13409/j.cnki.jdpme.20250423001.
为提升微生物诱导碳酸钙沉积(MICP)技术在土体加固中的应用效果,引入羧甲基纤维素钠(CMC‑Na)作为外加剂,通过室内试验,探究CMC‑Na掺量(0~0.8%)对MICP加固砂土的力学特性和微观结构的影响。试验结果表明:当CMC‑Na掺量为0.2%时,效果最优。其作用机制在于,CMC‑Na能增加胶结液黏度,延缓下渗速度,从而使钙离子利用率提高11.6%,碳酸钙生成量增加1.5倍。宏观性能测试表明,此掺量下的砂柱无侧限抗压强度达3 157.5 kPa(为空白对照组的9.8倍),渗透系数降低61.2%,且碳酸钙纵向分布更为均匀。微观分析进一步揭示,此时生成的碳酸钙晶型为球霰石,相较于未添加CMC‑Na形成的方解石,能更均匀地填充砂粒间孔隙,形成致密胶结结构,为MICP技术的优化及实际应用提供了新思路。
To enhance the application effectiveness of microbially induced calcium carbonate precipitation (MICP) technology in soil reinforcement
this study introduced sodium carboxymethyl cellulose (CMC-Na) as an additive
and conducted laboratory experiments to investigate the influence of CMC-Na content (0-0.8%) on the mechanical properties and microstructure of MICP-treated sandy soil. The experimental results showed that the optimal effect was achieved when the CMC-Na content was 0.2%. The mechanism lay in the fact that CMC-Na could increase the viscosity of the cementation solution and slow the infiltration rate
thereby increasing calcium ion utilization by 11.6% and increasing calcium carbonate production by 1.5 times. Macroscopic performance tests showed that at this content
the sand column achieved an unconfined compressive strength of 3 157.5 kPa (9.8 times that of the blank control group)
the permeability coefficient decreased by 61.2%
and the longitudinal distribution of calcium carbonate became more uniform. Microscopic analysis further revealed that the calcium carbonate crystals formed under this condition were vaterite
which
compared with the calcite formed without CMC-Na
filled the pores between sand particles more uniformly and formed a denser cementation structure. This study provides new insights for the optimization and practical application of MICP technology.
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