分级围压和变幅循环动载下粉土累积塑性变形特征及模型研究

doi:10.3724/1000-6915.jrme.2026.0148

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Abstract To elucidate the long-term dynamic deformation characteristics of subgrade filler under typical prestressed subgrade stress paths and facilitate reliable prediction, cyclic triaxial tests with stepwise confining pressure and variable-amplitude dynamic loading were conducted on silty filler collected from the roadbed layer of the Shuohuang Railway. The effects of the initial confining pressure, confining pressure increment, and dynamic stress amplitude on cumulative plastic strain and its cycle-based growth rate were systematically investigated, and a corresponding prediction model was established. The results show that increasing either the confining pressure increment or the initial confining pressure significantly suppresses the development of cumulative plastic strain, delays specimen failure, and promotes the transformation of potentially failure-prone specimens into critical- or stable-type specimens. As the initial dynamic stress amplitude increases, cumulative plastic strain increases, whereas the number of loading cycles to failure decreases significantly. During the nonaccelerated failure stage, the cycle-based growth rate of cumulative plastic strain exhibits a stepwise, sawtooth-like logarithmic linear decay with increasing loading cycles. The dynamic stress determines the overall magnitude of the growth rate, whereas the confining pressure increment primarily regulates and suppresses its development. The ratio of the confining pressure increment to the dynamic stress increment is a key parameter governing the evolution of cumulative plastic strain and the transformation of deformation patterns. Based on fractional calculus theory, a loading-cycle hardening concept is introduced to characterize the effects of previous loading history. In combination with a critical dynamic stress triggering mechanism, a fractional-order cumulative plastic strain prediction model is established to uniformly describe the development of stable-, critical-, and failure-type deformation. After parameter identification using nonlinear least squares, the coefficient of determination (R²) for cumulative plastic strain prediction under all test conditions in no less than 0.965. The cycle-based growth rate predicted by differentiating the model agrees well with the experimental results for representative cases, further confirming the models rationality and reliability. These findings provide a theoretical basis for controlling the long-term dynamic deformation of prestressed subgrades and evaluating their engineering applicability.

Key words： soil mechanics cyclic triaxial test silty filler graded confining pressure and variable-amplitude dynamic loading cumulative plastic strain prediction model

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	Articles by authors
	ZHANG Qishu1
	LIU Qian1
	DONG Junli1*
	WANG Wenbing1
	XU Fang2
	NIE Rusong2
	LI Yafeng3

Cite this article:

ZHANG Qishu1,LIU Qian1,DONG Junli1*, et al. Cumulative plastic deformation characteristics and its model of silt under graded confining pressure and variable-amplitude cyclic dynamic loading[J]. , 2026, 45(11): 3456-3474.

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https://rockmech.whrsm.ac.cn/EN/10.3724/1000-6915.jrme.2026.0148 OR https://rockmech.whrsm.ac.cn/EN/Y2026/V45/I11/3456

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