干湿和冻融循环作用下固化淤泥的动力特性及微观结构演化

doi:10.13229/j.cnki.jdxbgxb.20230788

摘要/Abstract

摘要：

为探明镁质水泥基多相胶凝材料固化的淤泥用作路基土的可行性，对经历不同干湿、冻融循环及加载条件的固化淤泥进行了动三轴和微观结构试验。基于动剪切模量、阻尼比等参数，研究了围压、动应力及加载频率对固化淤泥动力特性的影响，并建立了考虑干湿和冻融循环次数的动剪切模量预估模型。通过定量分析微观孔隙参数，揭示了不同干湿、冻融循环次数后固化淤泥微观结构的演变规律，并进行了微观结构参数与宏观力学性能的关联性分析。结果显示，干湿、冻融循环作用后，试样的动剪模量减小，阻尼比增大，且干湿循环引起的刚度衰减大于冻融循环。随着围压和加载频率的增大，固化淤泥的动剪切模量增大而阻尼比减小。干湿和冻融循环作用使固化淤泥的孔隙率增加，大孔隙数量增多，孔隙形态逐渐转变为平滑的扁角状。循环次数和加载频率对固化淤泥动力特性的影响程度大于围压和动应力幅值；微观结构形态参数对固化淤泥动力特性的影响都较为显著，其中孔隙率的影响程度最大。

关键词: 岩土工程, 固化淤泥, 干湿循环, 冻融循环, 动剪模量, 阻尼比, 微观结构

Abstract:

To investigate the feasibility of using magnesium oxychloride cement solidified sludge as subgrade， dynamic triaxial and microstructural tests were conducted on solidified sludge under different wet-dry and freeze-thaw cycles and loading conditions. The influences of confining pressure， dynamic load amplitude and loading frequency on the dynamic characteristics of solidified sludge were studied in terms of dynamic shear modulus and damping ratio， and a prediction model for dynamic shear modulus considering wet-dry and freeze-thaw cycle numbers was established. Quantitative analysis of microscopic pore parameters revealed the microstructural evolution of solidified sludge after different wet-dry and freeze-thaw cycle numbers， and correlation analysis was performed between microstructural parameters and macroscopic mechanical properties. The results show that after wet-dry and freeze-thaw conditioning， the dynamic shear modulus of specimens decreases while the damping ratio increases progressively， and wet-dry cycles lead to greater stiffness deterioration than freeze-thaw cycles. As confining pressure and loading frequency increase， the dynamic shear modulus of solidified sludge increases while the damping ratio decreases. Wet-dry and freeze-thaw cycles increase the porosity and coarse pores of solidified sludge， and the pore shape gradually transforms into smooth lamellar. The cycle number and loading frequency have more significant effects on the dynamic characteristics of sludge than confining pressure and dynamic stress amplitude. Among the microstructural morphology parameters， porosity has the greatest influence on the dynamic properties of sludge.

Key words: geotechnical engineering, solidified sludge, dry wetcycle, freeze-thaw cycle, dynamic shear modulus, damping ratio, microscopic structure

中图分类号:

TU414

王协群,于祥伟,邹维列,韩仲. 干湿和冻融循环作用下固化淤泥的动力特性及微观结构演化[J]. 吉林大学学报(工学版), 2025, 55(5): 1617-1628.

Xie-qun WANG,Xiang-wei YU,Wei-lie ZOU,Zhong HAN. Dynamic characteristics and microstructural evolution of solidified sludge under wet-dry and freeze-thaw cycling[J]. Journal of Jilin University(Engineering and Technology Edition), 2025, 55(5): 1617-1628.

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类型	循环次数N	围压σ_c/kPa	频率f/Hz
对照	0	27.6，41.4，55.2	1
冻融/干湿	1，3，5，7	41.4	1
	7	27.6，55.2	1
	7	41.4	2，3