加筋建筑垃圾土大型动三轴试验及加筋机制探讨

doi:10.13722/j.cnki.jrme.2019.1146

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Abstract A series of large dynamic triaxial tests are performed mainly on construction waste. The accumulative axial deformation of construction waste and sand，excess pore water pressure，dynamic stress-strain and dynamic elastic modulus with different types of reinforcement are investigated，and the reinforcement mechanism of construction waste reinforced with tires is analyzed. The experimental results demonstrate that cycle number and dynamic stress have a significant effect on dynamic behaviors of the filler. The accumulative axial deformation obtained in the tests is in line with the shakedown theory，and the load capacity of construction waste is higher than that of sand in the same shakedown range. Within 10 cycles，the accumulative axial deformation of construction waste is suitable for the hyperbolic model，while it is suitable for the modified Monismith model after 10 cycles. When the dynamic stress is higher than the critical dynamic stress，the excess pore water pressure has violent fluctuations. The closer the dynamic stress to the critical dynamic stress，the more obvious the fluctuation phenomenon is. As the cycle number increases，the hysteresis loop area gradually decreases while the dynamic elastic modulus of construction waste gradually increases. The hoop stress and friction resistance provided by the tire sidewall can enhance the particle-tire-particle interaction，which can reduce the horizontal and vertical developments of cracks. It is also revealed that the reinforcement effect of construction waste with the top tire is better than that of the bottom tire，and the effect of biaxial geogrid is not better than that of waste tire.

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soil mechanics reinforced construction waste large dynamic triaxial tests accumulative axial deformation dynamic stress-strain reinforcement mechanism

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	LI Lihua1
	QIN Langling1
	XIAO Henglin1
	HU Zhi1
	PEI Yaoyao1
	TONG Jun2

Cite this article:

LI Lihua1,QIN Langling1,XIAO Henglin1, et al. Large dynamic triaxial test study on reinforcement mechanisms of reinforced construction waste[J]. , 2020, 39(8): 1682-1695.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2019.1146 OR http://rockmech.whrsm.ac.cn/EN/Y2020/V39/I8/1682

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