常压至高压下砂土强度、变形特性试验研究

doi:10.13722/j.cnki.jrme.2016.0273

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Abstract The isotropic compression tests and triaxial shear tests were carried out for 3 different groups of sand. The mechanical properties of sand were analyzed in detail. A certain amount of particle breakage occurred under high pressure，which changed the shear energy consumption and led to a transition from shear dilation and softening to shear contraction and hardening. The particle size of sand and the confining pressure affected the peak stress ratio of sand. The classical M-C strength criterion was found to be not applicable anymore under the high pressure condition. However，the strength formula of the residual stress ratio was hardly affected by the particle size and the confining pressure. The residual stress ratio was a typical cohesionless frictional geomaterial property. The sand showed notably critical state phenomenon in the shearing process from common pressure to high pressure. Both the critical state curve and the isotropic compression curve declined exponentially and crossed each other under the high pressure. Two curves together constituted the state interval of sand which reflects the shear dilation and shear contraction.

Key words： soil mechanics high pressure isotropic compression curve critical state curve

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	Articles by authors
	LU Yong1
	ZHOU Guoqing2
	GU Huanda1

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LU Yong1,ZHOU Guoqing2,GU Huanda1. Experimental study of strength and deformation characteristics of sand under different pressures[J]. , 2016, 35(11): 2369-2376.

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http://rockmech.org/EN/10.13722/j.cnki.jrme.2016.0273 OR http://rockmech.org/EN/Y2016/V35/I11/2369

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