Experimental analysis of flow properties of fluidized solidified soil based on water film thickness theory

doi:10.3785/j.issn.1008-973X.2025.07.002

Journal of ZheJiang University (Engineering Science)

2025, Vol. 59

Issue (7): 1344-1352 DOI: 10.3785/j.issn.1008-973X.2025.07.002

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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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

Received: 26 May 2024 Published: 25 July 2025

CLC:

TU 443

Fund: 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）.

Corresponding Authors: Liang ZHANG E-mail: hqh@my.swjtu.edu.cn;LZhang@swjtu.edu.cn

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Cite this article:

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.

URL:

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

基于水膜厚度理论的流态固化土流动性能试验分析

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

Fig.1 X-ray diffraction patterns of red-bed mudstone

Fig.2 Schematic diagram of composition of fluidized solidified soil mixes

Tab.1 Test scheme of fluidized solidified soil

Fig.3 Test process of fluidized solidified soil

Fig.4 Variation curve of flow spread with water-to-solid ratio at different polycarboxylate superplasticizer dosages

Fig.5 Variation curve of bleeding rate with water-to-solid ratio at different polycarboxylate superplasticizer dosages

Fig.6 Variation curve of volume fraction of solid and void ratio with volumetric water-to-solid ratio

Fig.7 Variation curve of packing density and minimum void ratio with polycarboxylate superplasticizer dosage

Fig.8 Effect of polycarboxylate superplasticizer on Zeta potential of raw soil suspensions

Fig.9 Variation curve of water film thickness with polycarboxylate superplasticizer dosage and water-solid ratio

Fig.10 Variation curve of flow spread with water film thickness and polycarboxylate superplasticizer dosage

Fig.11 Flow spread contour

Fig.12 Variation curve of bleeding rate with water film thickness at different polycarboxylate superplasticizer dosages

Fig.13 Bleeding rate contour

Fig.14 Variation of critical water film thickness and flow spread with polycarboxylate superplasticizer dosage (no bleeding)

Fig.15 Variations of critical water film thickness with polycarboxylate superplasticizer dosage in different cases


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