考虑围压效应和塑性演化机制的中密砂力学模型

doi:10.13722/j.cnki.jrme.2018.0631

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Abstract The influencing factor and the characteristics of deformation and strength of medium dense sand samples were analyzed based on the macroscopic theory of elasto-plasticity and triaxial tests in order to precisely predict the deformation of medium dense sand on site. The yielding criteria，the hardening law and the flow rule were formulated accordingly. The stress-strain curves change with the increasing of confining pressure. The slope of the linear section of stress-strain curves and the peak strength increase with the increasing of confining pressure. The softening section reduces and even disappears. The gradient of volumetric strain-axial strain curve remains as usual basically. The shear dilation decreases. Under the high confine pressure，the samples exhibit the shear contraction in the whole shearing process. Considering the confining effect and shear failure in medium dense sand，the internal plastic variable is expressed by the third principal stress and effective plastic shear strain increment. The internal plastic variable at peak is larger than 0.5 and much larger than that of rock. The elastic modulus increases exponentially with the increasing of confining pressure. Poisson?s ratio remains the same approximately. The maximum and minimum principal stresses vary linearly in the process of plastic deformation. The internal friction angle increases linearly，and the cohesion increases and then decreases exponentially. The dilation angle decreases with the plastic deformation under the low confining pressure，but it increases and decreases under the high confining pressure. The calculated curve is basically identical to the experimental data，indicating that the model is suitable for medium dense sand.

Key words： soil mechanics confining pressure effects plastic evolution medium dense sand mechanical model elastoplastic theory

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	Articles by authors
	LI Zhen1
	ZHAO Hongbo1
	LIU Shangge2
	XU Rongchao3
	WANG Yunfei1

Cite this article:

LI Zhen1,ZHAO Hongbo1,LIU Shangge2, et al. Mechanical model for medium dense sand considering confining pressure effect and plastic evolution[J]. , 2018, 37(11): 2610-2620.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2018.0631 OR https://rockmech.whrsm.ac.cn/EN/Y2018/V37/I11/2610

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