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浙江大学学报(工学版)
浙江大学学报(工学版)  2025, Vol. 59 Issue (7): 1344-1352    DOI: 10.3785/j.issn.1008-973X.2025.07.002
土木与交通工程     
基于水膜厚度理论的流态固化土流动性能试验分析
胡秋辉1(),罗强1,2,张良1,2,*(),罗威龙1,覃李兵1
1. 西南交通大学 土木工程学院，四川 成都 610031
2. 西南交通大学 高速铁路线路工程教育部重点实验室，四川 成都 610031
Experimental analysis of flow properties of fluidized solidified soil based on water film thickness theory
Qiuhui HU1(),Qiang LUO1,2,Liang ZHANG1,2,*(),Weilong LUO1,Libing QIN1
1. School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China
2. Key Laboratory of High-Speed Railway Engineering of the Ministry of Education, Southwest Jiaotong University, Chengdu 610031, China
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摘要：

工程弃土流态固化改性可实现资源化利用，解决狭窄异形空间回填难题. 采用红层泥岩弃方制备流态水泥固化土，测试流动度和泌水率及固体体积分数随水固比和聚羧酸减水剂(PCE)掺量的变化特性；基于水膜厚度(WFT)理论，建立流态固化土颗粒WFT与堆积密度及固体颗粒比表面积的关系，分析WFT及PCE掺量对流态固化土流动性能的影响规律. 试验结果表明：PCE具有分散颗粒絮凝团聚及降低粒间黏聚力的双重效应，当掺配质量分数为0.4%时可提高堆积密度5.33%，相同水固比下水膜厚度增加0.123 μm. 流态固化土流动度、泌水率随WFT增厚线性增加，且PCE掺量越高提升幅度越大. 基于回归方程确定无泌水条件下的临界水膜厚度及流动度，掺配PCE的质量分数从0增至0.4%，临界水膜厚度降低36.94%，临界流动度提升了86.96%.
关键词： 流态水泥固化土;  水膜厚度;  减水剂;  流动度;  泌水率    
Abstract:

Fluidized solidification modification of engineering spoils can achieve resource utilisation, solving the backfilling problem of narrow or irregular spaces. The fluidized cement solidified soil was prepared using the red-bed mudstone waste, and the dynamic characteristics of flow spread, bleeding rate and volume fraction of solid with water-to-solid ratio and polycarboxylate superplasticizer (PCE) dosage were tested. Based on the water film thickness (WFT) theory, the relationship between WFT of fluidized solidified soil particles and the packing density and the specific surface area of the solid particles was established; the effect of WFT and PCE dosage on the flow properties of the fluidized solidified soil was analysed. Experimental results show that PCE has the dual effects of dispersing particle flocculation and agglomeration, as well as reducing inter-particle cohesion. Doping at a mass fraction of 0.4% can improve the packing density by 5.33%, and under the same water-to-solid ratio, increase the WFT by 0.123 μm. The flow spread and bleeding rate of fluidized solidified soil with the WFT thickening increase linearly, and the higher the PCE dosage, the greater the magnitude of the enhancement. Based on the regression equation, the critical WFT and flow spread were determined under the condition of no bleeding, and the critical WFT decreased by 36.94% when the mass fraction of blended PCE increased from 0 to 0.4%, but the critical flow spread was improved by 86.96%.
Key words: fluidized cement solidified soil    water film thickness    superplasticizer    flow spread    bleeding rate
收稿日期: 2024-05-26 出版日期: 2025-07-25
CLC:  TU 443  
基金资助: 国家自然科学基金资助项目（52078435）；四川省自然科学基金资助项目（2023NSFSC0391）.
通讯作者: 张良     E-mail: hqh@my.swjtu.edu.cn;LZhang@swjtu.edu.cn
作者简介: 胡秋辉（2000—），男，硕士生，从事路基工程研究. orcid.org/0009-0009-7273-8833. E-mail：hqh@my.swjtu.edu.cn
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引用本文:

胡秋辉,罗强,张良,罗威龙,覃李兵. 基于水膜厚度理论的流态固化土流动性能试验分析[J]. 浙江大学学报(工学版), 2025, 59(7): 1344-1352.

Qiuhui HU,Qiang LUO,Liang ZHANG,Weilong LUO,Libing QIN. Experimental analysis of flow properties of fluidized solidified soil based on water film thickness theory. Journal of ZheJiang University (Engineering Science), 2025, 59(7): 1344-1352.

链接本文:

https://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2025.07.002    或    https://www.zjujournals.com/eng/CN/Y2025/V59/I7/1344

图 1  红层泥岩XRD图谱
图 2  流态固化土混合料组成示意图
试验类别C/（kg·m?3）P/%W/%
堆积密度1000, 0.1, 0.2, 0.3, 0.424, 26, 28, 30, 32, 34, 36, 38, 40
WFT32, 34, 36, 38, 40, 42, 44, 46, 48, 50, 52, 54, 56,58
流动度32, 34, 36, 38, 40, 42, 44, 46, 48, 50, 52, 54, 56,58
泌水率34, 36, 38, 40, 42, 44, 46, 48, 50, 52, 54
表 1  流态固化土试验方案
图 3  流态固化土试验流程
图 4  不同聚羧酸减水剂掺量下流动度随水固比变化曲线
图 5  不同聚羧酸减水剂掺量下泌水率随水固比变化曲线
图 6  固体体积分数和空隙比随体积水固比变化曲线
图 7  堆积密度和最小空隙比随聚羧酸减水剂掺量变化曲线
图 8  聚羧酸减水剂对原料土悬浮液Zeta电位的影响
图 9  水膜厚度随聚羧酸减水剂掺量和水固比变化曲线
图 10  流动度随水膜厚度和聚羧酸减水剂掺量变化曲线
图 11  流动度等值线图
图 12  不同聚羧酸减水剂掺量下泌水率随水膜厚度变化曲线
图 13  泌水率等值线图
图 14  临界水膜厚度及流动度随聚羧酸减水剂掺量变化(无泌水条件下)
图 15  不同情况的临界水膜厚度随聚羧酸减水剂掺量变化
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