纤维底渣混合土循环剪切性能研究

doi:10.13722/j.cnki.jrme.2020.0395

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Abstract As one of the common solid wastes，municipal solid waste incineration(MSWI) bottom ash can be mixed with fibers to improve its strength and stability. In this paper，in order to investigate the characteristics of fiber-reinforced bottom ash mixed clay soil under different vertical stresses，different shear displacement amplitudes and different degrees of compaction，large direct shear tests before and after cyclic shear and cyclic shear tests were carried out on the mixture of MSWI-clay-polypropylene fiber at a certain ratio. The test results show that the shear displacement and shear stress curves in the monotonic direct shear tests present weak hardening phenomenon while that the shear stress-displacement curves present obvious softening in the monotonic direct shear tests after cyclic shear. During the cyclic shear process，the soil samples show cyclic shear hardening and shear shrinkage under different vertical stresses and different shear displacement amplitudes. As the number of cycles increases，the degree of hardening and the amount of shear shrinkage gradually decrease. With increasing the degree of compaction，the specimen develops from a clear hardened type to a softened type. The greater the degree of compaction，the less the amount of settlement and the smaller the amount of shear shrinkage. Comparing the results of cyclic monotonic direct shear test after cyclic shear and non-cyclic monotonic direct shear test，it is found that the shear strength of the soil sample after cyclic shear increases significantly，and the cohesion and friction angle increase accordingly. The addition of polypropylene fibers can form a spatial network skeleton with the bottom ash mixed soil，thereby increasing the resistance of the sample against deformation，improving stability and reducing vertical settlement.

Key words： soil mechanics MSWI bottom ash bottom ash mixed clay soil cyclic shear test monotonic shear test fiber reinforcement

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	Articles by authors
	LI Lihua1
	2
	ZANG Tianbao1
	2
	LIU Yongli1
	2
	XIAO Henglin1
	2
	LI Wentao1
	2

Cite this article:

LI Lihua1,2,ZANG Tianbao1, et al. Cyclic shear performance of fiber bottom ash mixed soils[J]. , 2021, 40(1): 196-205.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2020.0395 OR http://rockmech.whrsm.ac.cn/EN/Y2021/V40/I1/196

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