GGBS-MICP协同固化淤泥质砂土工程特性研究

doi:10.3724/1000-6915.jrme.2024.0570

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摘要为实现固体废渣资源化利用和土体加固的双赢，将高炉矿渣(GGBS)与微生物诱导碳酸盐沉淀(MICP)技术相结合(GGBS-MICP)，通过无侧限抗压强度(UCS)、三轴压缩、抗侵蚀能力、利用量、pH值和扫描电镜(SEM)等技术方法，探究不同颗粒粒径和掺量影响下GGBS联合MICP技术固化淤泥质砂土的工程特性与微观机制。对比单独施加GGBS和MICP技术加固的淤泥质砂土试样，GGBS-MICP固化试样的UCS值明显增强，且GGBS颗粒尺寸越细，增强效果越显著，尤其在颗粒尺寸＜10 时更为显著。对于未添加/添加的＜10 GGBS- MICP固化土试样，有效黏结力c?和内摩擦角峰值分别出现在1%和3%的GGBS掺量。充足的明显提升GGBS-MICP固化试样抵抗盐溶液侵蚀的能力，抗侵蚀性能依次为：水溶液＞1%的Na2SO4溶液＞1%的NaCl溶液。SEM结果显示，GGBS-MICP试样中C-S-H凝胶产物结构更加丰富致密，且GGBS能调控生物CaCO3晶体形态，球霰石晶体发育优于方解石和文石。粒径＜10 的GGBS-MICP与原GGBS-MICP固化淤泥质砂土试样之间的pH差值(ΔpH)表明，未添加的ΔpH＞添加的ΔpH；GGBS-MICP(含 )体系中利用量随GGBS掺量增加而提高，论证充足的钙源对GGBS-MICP联合固化效能优化的重要性。综上，采用粒径＜10 的3% GGBS-MICP(含 )固化方法能显著提高淤泥质砂土工程特性与微观结构密实性，实现固体废渣高效利用，契合绿色可持续发展战略需求。

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	王东星1
	许凤丽1
	泮晓华2
	商武锋3
	吴章平4
	郭克诚5

关键词 ：土力学, 高炉矿渣, MICP, 抗压强度, 抗侵蚀能力, 生物CaCO3

Abstract：To facilitate the reutilization of solid waste and the solidification of soil，this study integrates ground granulated blast-furnace slag(GGBS) with microbial induced carbonate precipitation(MICP) technology，referred to as GGBS-MICP. It aims to investigate the engineering properties of silty-sandy specimens solidified with various particle sizes and dosages of GGBS combined with MICP technology through a series of tests，including unconfined compressive strength(UCS)，triaxial compression，erosion resistance，Ca2+ utilization quantity，pH values，and scanning electron microscopy(SEM). Compared to silty-sandy specimens treated solely with GGBS and MICP，those solidified by GGBS-MICP exhibit a significantly increased UCS. Finer GGBS particles yield a more pronounced enhancement，especially with＜10 GGBS-MICP. For ＜10 GGBS-MICP solidified silty-sandy samples with/without ，the peak values of effective bonding strength c? and internal friction angle occur at 1% and 3% GGBS dosages，respectively. Adequate effectively enhances the erosion resistance of GGBS-MICP solidified samples against the saline solutions，and the erosion resistance follows the sequence：water＞1%Na2SO4＞1%NaCl. SEM analysis reveals a denser C-S-H gel structure in GGBS-MICP samples，with GGBS being capable of regulating the crystal morphology of bio-CaCO3，where the crystal growth of vaterite predominates over that of calcite and aragonite. The difference in pH values(ΔpH) between＜10 GGBS-MICP and original GGBS-MICP solidified silty-sandy samples indicates that ΔpH1 without Ca2+ is greater than ΔpH2 with . The increase in utilization quantity with increasing GGBS dosages in GGBS-MICP(with ) samples highlights the importance of sufficient calcium sources for the effective solidification using GGBS-MICP technology. Therefore，the adoption of＜10 3%GGBS-MICP(with ) solidification approach greatly enhances the engineering properties of silty-sandy soil，achieving the efficient utilization of solid waste，and aligning with the strategies of green and sustainable development.

Key words： soil mechanics ground granulated blast-furnace slag(GGBS) MICP compressive strength erosion resistance bio-CaCO3

引用本文:

王东星1，许凤丽1，泮晓华2，商武锋3，吴章平4，郭克诚5. GGBS-MICP协同固化淤泥质砂土工程特性研究[J]. 岩石力学与工程学报, 2025, 44(5): 1349-1362.
WANG Dongxing1，XU Fengli1，PAN Xiaohua2，SHANG Wufeng3，WU Zhangping4，GUO Kecheng5. Study on the engineering properties of GGBS-MICP synergistic solidification of silty-sandy soil. , 2025, 44(5): 1349-1362.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.3724/1000-6915.jrme.2024.0570 或 https://rockmech.whrsm.ac.cn/CN/Y2025/V44/I5/1349

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