土工基础

土工基础 ›› 2025, Vol. 39 ›› Issue (3): 494-499.

• 测试技术 • 上一篇    下一篇

铝离子絮凝剂协同MICP固化珊瑚砂力学特性试验研究

革晓航1，龚建伍1,2   

  1. （1.武汉科技大学城市建设学院，武汉 430065；2.武汉科技大学 城市更新湖北省工程研究中心，武汉 430065）
  • 收稿日期:2024-10-29 修回日期:2024-12-01 出版日期:2025-06-30 发布日期:2025-08-05
  • 通讯作者: 龚建伍(1978-)，男，博士，教授，研究方向隧道与地下结构工程。
  • 作者简介:革晓航(2000-)，男，硕士研究生，研究方向为岩土工程。
  • 基金资助:
    武汉科技大学教学研究项目（2022X012）；武汉科技大学研究生质量工程项目（Yjg202303）

Experimental Study on Mechanical Properties of Coral Sand Solidified by Aluminum Ion Flocculant in Collaboration with MICP

GE Xiaohang1， GONG Jianwu1,2   

  1. (1.School of Urban Construction，Wuhan University of Science and Technology, Wuhan 430065；
    2.Hubei Provincial Engineering Research Center of Urban Rehabilitation, Wuhan University of Science and Technology, Wuhan 430065)
  • Received:2024-10-29 Revised:2024-12-01 Online:2025-06-30 Published:2025-08-05

摘要： 微生物诱导碳酸钙沉淀（MICP）是岩土工程领域中的研究热点之一，但其繁琐的处理步骤和较低的固化效率限制了其在固化珊瑚砂方面的进一步应用。为减少处理次数和提高固化珊瑚砂的效率，在胶结液中加入不同浓度的铝离子絮凝剂（AlCl3·6H2O），通过试验研究铝离子絮凝剂对MICP的固化速度和固化效果的影响。试验结果表明：经过6次循环灌浆处理，砂柱的无侧限抗压强度达到对照组的2.8~7.2倍，且无侧限抗压强度最高可达2 123 kPa；铝离子絮凝剂的引入能够有效促使珊瑚砂柱中生成的碳酸钙晶体由不稳定的球霰石型转化为稳定的方解石型，从而显著提升了MICP固化效率。研究结果验证了铝离子絮凝剂协同微生物固化技术在岛礁钙质砂加固方案中的可行性。

关键词: 微生物诱导碳酸钙沉淀, 珊瑚砂, 铝离子絮凝剂, 无侧限抗压强度, 固化机理

Abstract: The microbial induced calcium carbonate precipitation (MICP) is one of the types of research focuses in the field of geotechnical engineering, but its cumbersome treatment steps and low curing efficiency limit its further applications in the curing coral sands. To reduce the number of processing times and to improve the efficiency of the curing coral sands, different concentrations of the aluminum ionic flocculant (AlCl3·6H2O) were added to the cementing solution, and the effects of the aluminum ionic flocculant on the curing speed and curing effect of the MICP were investigated through experiments. The experimental results showed that: after 6 cycles of the grouting treatment, the unconfined compressive strength of the sand column reached 2.8～7.2 times of that of the control group, and the unconfined compressive strength could reach up to 2123 kPa; the introduction of the aluminum ionic flocculant could effectively induce the calcium carbonate crystals generated in the coral sand column to be transformed from unstable spherical chalcocite type to stable calcite type, which significantly enhanced the curing efficiency of the MICP. The results verified the feasibility of the microbial curing technology with aluminum ionic flocculant in the calcareous sand reinforcement scheme for island reefs.

Key words: Microbial Induced Calcium Carbonate Precipitation, Coral Sand, Aluminum Ion Flocculant, Unconfined Compressive Strength, Curing Mechanism

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