土工基础

土工基础 ›› 2025, Vol. 39 ›› Issue (5): 807-810.

• 测试技术 • 上一篇    

基于固废的复合固化剂配方优化及其对滨海淤泥质土的固化机理研究

王晓冬1,张 鑫2   

  1. （1.四川省交通建设集团有限责任公司,成都 610041;2.西华大学 建筑与土木工程学院,成都 610039）
  • 收稿日期:2025-08-31 修回日期:2025-09-23 出版日期:2025-10-31 发布日期:2025-10-30
  • 作者简介:王晓冬（1976-），男，工程师，研究方向为土木工程、岩土工程等。

Optimization of Solid WasteBased Composite Stabilizer Formulations and Study on the Stabilization Mechanism of Marine Soft Clays

WANG Xiaodong1， ZHANG Xin2   

  1. (1.Sichuan Provincial Transportation Construction Group Co. Ltd., Chengdu 610041；
    2.School of Architecture and Civil Engineering, Xihua University, Chengdu 610039)
  • Received:2025-08-31 Revised:2025-09-23 Online:2025-10-31 Published:2025-10-30

摘要： 滨海淤泥质土资源化利用对于提升沿海地区土地资源价值、保障工程建设和实现工业固废绿色低碳处置具有重要意义。为解决滨海淤泥质土固化难题并资源化利用工业固废，以煤矸石、粉煤灰为基材，生石灰、硅酸钠为激发剂，开发了一种复合无机固化剂。采用混料D最优试验设计法优化配方，并通过SEM、EDS及PCAS等手段研究其微观固化机理。结果表明，最优配比（煤矸石∶粉煤灰∶生石灰∶硅酸钠=0.05∶0.3∶0.25∶0.4）下，固化土28 d无侧限抗压强度达692.94 kPa。固化机理为碱激发火山灰反应生成C-S-H等凝胶，填充并密实土体孔隙结构，使孔隙面积比从33.1%降至9.58%。研究为固废基固化剂的应用提供了有效配方和理论依据。


关键词: 淤泥质土, 固化剂, 配方优化, 固化机理, 微观结构, 工业固废

Abstract: The resource utilization of marine soft clay is of great significance for enhancing the value of land resources in coastal areas, ensuring the construction projects and achieving green and low-carbon disposal of industrial solid waste. To address the challenge of the stabilizing marine soft clay and to promote the resource utilization of industrial solid wastes, this study developed a composite inorganic stabilizer using coal gangue and fly ash as base materials, and quicklime and sodium silicate as activators. A D-optimal mixture design was employed to optimize the formulation, while SEM, EDS, and PCAS analyses were conducted to investigate the microstructural stabilization mechanism. The results show that at the optimal proportion (coal gangue: fly ash: quicklime: sodium silicate = 0.05:0.30:0.25:0.40), the unconfined compressive strength (UCS) of the stabilized soil reached 692.94 kPa after 28 days. The stabilization mechanism involves the alkali-activated pozzolanic reaction generating C-S-H gels and related products, which fill and densify the soil pore structure, reducing the porosity ratio from 33.1% to 9.58%. This research provides both an effective formulation and theoretical basis for the application of solid waste-based stabilizers in soft soil improvement.

Key words: Peaty Soils, Stabilizers, Additive Optimization, Microstructure, Industrial Solid Waste

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