建筑固废再生填料累积变形及临界动应力试验研究

doi:10.13722/j.cnki.jrme.2022.1340

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Abstract Recycling construction and demolition waste(CDW) in the construction of transportation infrastructure can benefit from various environmental，economic and social aspects. The gradual accumulation of permanent deformation of the granular structural layer under traffic loading may lead to rutting，cracking，and other diseases of the pavement，thus reducing its service life. In this paper，the plastic deformation characteristics of coarse-grained soil filler recycled from CDW under different stress states were studied by repeated-load triaxial tests，and the influence law of particle breakage state on plastic deformation and critical dynamic stress was investigated by designing five different graduation specimens. The prediction models of accumulated plastic strain and critical dynamic stress were established based on the measured data，which can comprehensively consider the particle breakage state and stress level. The test results show that the axial accumulated strain of recycled aggregates gradually decreases with the increase of confining pressure or the decrease of dynamic stress amplitude；the increase of particle breakage weakens the ability of specimens to resist plastic deformation. The established accumulated plastic strain prediction model overcomes the dispersion of the parameters of the accumulated plastic strain calculation model under different gradation conditions. The empirical equation for the critical dynamic stress based on the shake-down theory provides a theoretical basis for the reasonable assessment of the dynamic stability of the recycled coarse-grained soil filler under the action of traffic load.

Key words： road engineering accumulated plastic strain repeated-load triaxial tests unbound aggregates recycled from CDW critical dynamic stress particle breakage

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	Articles by authors
	KONG Kunfeng1
	CHEN Feng1
	XIAO Yuanjie2
	3
	JIANG Yu2
	Umar Faruk Aminu2
	CHEN Yuliang4
	LI Zhiyong4

Cite this article:

KONG Kunfeng1,CHEN Feng1,XIAO Yuanjie2, et al. Experimental investigation of accumulated plastic strain and critical dynamic stress of unbound aggregates recycled from construction and demolition waste[J]. , 2023, 42(11): 2820-2831.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2022.1340 OR http://rockmech.whrsm.ac.cn/EN/Y2023/V42/I11/2820

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