干密度和基质吸力对重塑非饱和黄土变形与强度特性的影响

doi:10.13722/j.cnki.jrme.2015.1761

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Abstract In order to solve the problems of the settlement and stability of high-filled slopes，three-dimensional shear tests were carried out to investigate the behavior of unsaturated soil of different dry densities under controlled suction from Yan?an new district. The variations of the deformation and strength of the remolded loess soils were studied. The test results show that the dry density and matric suction influence remarkably the damage form and characteristics of the deformation and strength. The stress-strain relation varies from the strain hardening to the ideal elasto-plastic then to the strain softening as the increasing of dry density. The greater the dry density and suction，the more obvious the dilation and the higher the strength. The cohesion，the friction angle of the suction and the internal friction angle increased with the increasing of the dry density. The friction angle of unsaturated loess soil changes little with the matric suction variation，but the cohesion increases linearly with the increasing of matric suction. The initial tangential modulus and the volumetric deformation modulus increased with the increasing of the dry density and suction. An expression for strength and a nonlinear model considering the impact of dry density and suction and values of relevant parameters of the soil are proposed for the predictions of the parameters of the strength and deformation of remolded loess soils under different densities and different matric suctions.

Key words： soil mechanics remolded loess soil matric suction nonlinear model parameters

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	Articles by authors
	GAO Denghui1
	CHEN Zhenghan1
	2
	GUO Nan1
	ZHU Yanpeng1
	HU Shengxia3
	YAO Zhihua4

Cite this article:

GAO Denghui1,CHEN Zhenghan1,2, et al. The influence of dry density and matric suction on the deformation and the strength characteristics of the remolded unsaturated loess soils[J]. , 2017, 36(3): 736-744.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2015.1761 OR http://www.rockmech.org/EN/Y2017/V36/I3/736

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