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

Abstract

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

CLC Number:

TU414

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

Dynamic characteristics and microstructural evolution of solidified sludge under wet-dry and freeze-thaw cycling

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