列车间歇荷载作用下路基细粒土填料的塑性变形行为及临界动应力研究

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Abstract The dynamic loading of the trains on the subgrade includes the cyclic loading stage and the intermittent stage，that is，an intermittent dynamic loading. To study the plastic deformation behavior and the critical dynamic stress of the subgrade filler under the intermittent loading of trains，a series of continuous and continuous-stopping repeated load triaxial tests under different water contents，confining pressures and dynamic stress levels were conducted，and the influence of the loading intermittence on the deformation characteristics of the silt filler and the plastic deformation behavior under intermittent loading were analyzed. The test results indicate that due to the unloading and drainage in the intermittent stage，the excess pore water pressure accumulated in the loading stage dissipates in the intermittent stage and the particles and the structure of the soil were also adjusted，reducing the accumulation of the plastic strain in subsequent loading stages，and increasing the critical dynamic stress of the sample. The plastic deformation behavior of the silt filler under the intermittent loading can be classified as plastic shakedown，plastic creep and incremental collapse. Based on the plastic strain rate，a criterion for classifying the plastic deformation behaviors of silt under intermittent loading was established. By introducing the static strength，an empirical formula of the critical dynamic stress of silt under intermittent loading，considering the water content and the confining pressure，was proposed. The research results are of great significance for understanding the deformation behavior and dynamic stability of the subgrade under the actual railway operation conditions.

Key words： soil mechanics dynamic triaxial test intermittent loading of trains fine-grained soil plastic deformation behavior critical dynamic stress shakedown theory

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	Articles by authors
	NIE Rusong1
	2
	LI Yafeng1
	LENG Wuming1
	2
	SUN Baoli1
	LIU Xing1
	CHEN Mengfan1

Cite this article:

NIE Rusong1,2,LI Yafeng1, et al. Plastic deformation and critical dynamic stress of fine-grained soils under intermittent loading of trains[J]. , 2021, 40(4): 828-841.

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http://rockmech.whrsm.ac.cn/EN/Y2021/V40/I4/828

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