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1.河海大学海岸灾害及防护教育部重点实验室,江苏 南京210098
2.河海大学港口海岸与近海工程学院,江苏 南京 210098
3.东南大学土木工程学院,江苏 南京 210096
Received:31 August 2023,
Revised:2024-04-04,
Published:25 June 2024
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黄挺,郑杰,戴国亮等.水下抗分散水泥土正交试验及配比优化方法研究[J].防灾减灾工程学报,2024,44(03):678-688.
HUANG Ting,ZHENG Jie,DAI Guoliang,et al.Research on Orthogonal Experiments and Optimization of Mixing Ratios for Underwater Anti‑Dispersion Cement‑Stabilized Soil[J].Journal of Disaster Prevention and Mitigation Engineering,2024,44(03):678-688.
黄挺,郑杰,戴国亮等.水下抗分散水泥土正交试验及配比优化方法研究[J].防灾减灾工程学报,2024,44(03):678-688. DOI: 10.13409/j.cnki.jdpme20230831001.
HUANG Ting,ZHENG Jie,DAI Guoliang,et al.Research on Orthogonal Experiments and Optimization of Mixing Ratios for Underwater Anti‑Dispersion Cement‑Stabilized Soil[J].Journal of Disaster Prevention and Mitigation Engineering,2024,44(03):678-688. DOI: 10.13409/j.cnki.jdpme20230831001.
水流经过桩基时会形成漩涡侵蚀床面,影响桩基及上部结构的稳定性,冲刷治理是工程界关注的热点问题。为促进固化土技术在桩基冲刷修复中的应用,设计开展了抗分散水泥固化土系列正交试验。针对高岭土和淤泥土,选用PAM、EVA、黄原胶、HPMC四种抗分散剂,采用平均效果分析和极差分析,研究了抗分散剂种类、抗分散剂掺量、含水量和水泥掺量对流动度、浊度、7 d和28 d无侧限抗压强度的影响。结果表明:对于高岭土,抗分散剂掺量从0.25‰增大到1‰,水泥土流动度减小20%,浊度减小25%,抗分散剂掺量对流动性和抗分散性的影响显著。对于淤泥土,对抗分散性影响显著的仍是抗分散剂掺量,而对流动性的影响显著的则是含水量,含水量从1.4倍液限增大到2.0倍液限,水泥土流动度增大45%。基于综合平衡法、矩阵分析法和多元线性回归模型,提出了一种抗分散水泥土配比设计方法,研究得到了高岭土和淤泥土抗分散水泥固化土的推荐配比,其在泥沙起动实验中的抗冲刷特性明显优于原始土样。
Water flow around pile foundations can create vortices that erode the bed surface
compromising the stability of both pile foundations and superstructure. Therefore
addressing scour management has always been a hot topic in engineering. To advance the application of cement-stabilized soil technology in scour repair for pile foundations
orthogonal experiments were designed and carried out on dispersion-resistant cement-stabilized soils. Four types of anti-dispersants
PAM
EVA
xanthan gum
and HPMC
were selected for kaolinite and silt soils. The effects of anti-dispersants type
anti-dispersant dosage
water content
and cement dosage on fluidity
turbidity
and unconfined compressive strength at 7 and 28 days were studied using average effect and range analysis. The results showed that for kaolinite
increasing the anti-dispersants content from 0.25 ‰ to 1 ‰ decreased the fluidity of the cement-stabilized soil by 20% and turbidity by 25%
demonstrating a significant impact on both fluidity and anti-dispersion properties. For silt soils
the anti-dispersant dosage significantly influenced anti-dispersion properties
while water content was the main factor affecting fluidity. When the water content increased from 1.4
w
L
to 2.0
w
L
the fluidity of cement-stabilized soil increased by 45%. Based on the comprehensive balance method
matrix analysis method
and multiple regression linear model
a method for designing the mixing proportions of anti-dispersion cement-stabilized soil was proposed. The recommended ratio of kaolinite and silt soils showed significantly better anti-scour characteristics in the sediment initiation experiments compared to the original soil sample.
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