| 李守庆,卫阳,周天智,李国臣,韩劲松,武恒.天津滨海新区碱渣土无侧限抗压强度试验研究[J].地质找矿论丛,2025,40(4):533-541 |
| 天津滨海新区碱渣土无侧限抗压强度试验研究 |
| Unconfined Compressive Strength Test of Alkali Residue Soil in Binhai New Area, Tianjin |
| 投稿时间：2025-08-26 修订日期：2025-11-05 |
| DOI：10.6053/j.issn.1001-1412.2025.04.010 |
| 中文关键词: 碱渣 碱渣土 无侧限抗压强度 粉煤灰 水泥 |
| 英文关键词:alkali residue alkali residue soil unconfined compressive strength fly ash cement |
| 基金项目:中国科学院科研院所与企业合作项目“基于土壤微界面活性组分调控的有机污染场地化学强化修复技术研究”（25YFYSHZ00010）资助。 |
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| 中文摘要: |
| 本文以天津滨海新区碱渣土为研究对象，通过室内试验测定其含水率、密度、比重、颗粒组成、界限含水率、渗透系数、压缩系数等基本参数，分析得出该碱渣具有高含水率（均值212.3 %）、大孔隙比（均值4.933）、高液塑限（液限均值 134.0 %、塑限均值 97.8 %）、高压缩性（压缩系数 4.821 MPa-1）及微-弱透水性（渗透系数 1.5×10-6 cm/s~3.5×10-6cm/s）等特性，其骨架以亲水性较强的 CaCO3为主，呈流塑状态。在击实试验确定的最优含水率下，采用不同水泥（20 %、25 %、30 %）和粉煤灰（8 %）掺量配比制备试样，进行3 d、7 d、28 d龄期的无侧限抗压强度试验。结果表明：水泥和粉煤灰均可有效提高碱渣土强度，且强度随水泥掺量和龄期增加而显著提升；3 d至7 d为强度快速增长期，7 d至28 d增长放缓；28 d龄期时，30 %水泥掺量试样强度达0.483 MPa，为20 %水泥掺量的2.56倍；20 %水泥+8 %粉煤灰掺量试样28 d强度（0.251 MPa）与25 %水泥掺量试样（0.267 MPa）相近（差异仅6 %），可减少5 %水泥用量；单掺20 %水泥增长最平缓，增长速率低于其他配比，证明低水泥掺量下强度提升有限，需搭配粉煤灰优化。经实际工程现场验证，20 %水泥与8 %粉煤灰的材料配比方案应用于项目的止水帷幕，整体实施效果良好，可为同类项目提供经验借鉴。研究成果为碱渣作为填垫材料的配比优化及资源化利用提供了量化依据和工程参考。 |
| 英文摘要: |
| This paper takes alkaline slag soil in the Tianjin Binhai New Area as the research object and determines its basic parameters, including moisture content, density, specific gravity, particle composition, Atterberg limits, permeability coefficient, and compression coefficient, through laboratory tests. The analysis shows that the alkaline slag has the characteristics of high moisture content (average 212.3 %), large void ratio (average 4.933 %), high liquid and plastic limits (average liquid limit 134.0 %, average plastic limit 97.8 %), high compressibility (compression coefficient 4.821 MPa-1), and micro-weak water permeability (permeability coefficient 1.5×10-6 cm/s~3.5×10-6 cm/s). Its skeleton is mainly composed of CaCO3, which is highly hydrophilic, exhibiting a flow-plastic state. Under the optimal moisture content determined by the compaction test, specimens with different cement-to-fly ash proportions (20 %, 25 %, 30 %) and fly ash contents (8 %) were prepared for unconfined compressive strength tests at 3 d, 7 d, and 28 d. The results show that both cement and fly ash can effectively improve the strength of alkaline slag soil, and that strength increases significantly with increasing cement content and age. The period from 3 d to 7 d is one of rapid strength growth, while growth slows from 7 d to 28 d. At 28 d, the strength of the specimen with 30 % cement content reaches 0.483 MPa, which is 2.56 times that of the specimen with 20 % cement content. The 28 d strength of the specimen with 20 % cement + 8 % fly ash (0.251 MPa) is close to that of the specimen with 25 % cement content (0.267 MPa) (with a difference of only 6 %), which can reduce the cement dosage by 5 %.In the actual engineering field verification, the material ratio scheme of 20 % cement and 8 % fly ash was applied to the project's water-stop curtain, and the overall implementation effect was good, providing an experience reference for similar projects. The research results provide a quantitative basis and engineering reference for optimizing the proportions and resource utilization of alkaline slag as a filling material. |
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