基于临界状态理论的尾砂广义塑性模型研究及其应用

doi:10.13722/j.cnki.jrme.2016.0591

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Abstract

In order to build a more accurate and reasonable tailings constitutive model，an elasto-plastic sand model was modified based on test results. The critical state theory and state parameter were introduced into Pastor-Zienkiewicz III generalized plasticity model to describe the triaxial test results of tailings sand. Comparison between test result and model simulation shows that the generalized plasticity model can exactly reflect the influence of confining pressure on the shear strength and volume strain behavior，which the original model can not describe. Compared with Duncan-Chang model，the proposed model is capable of simulating the strain softening effect and shear dilation under low confining pressure of tailings sand. Finally，the proposed model is applied into finite element analysis of tailings dams. FE analysis results show that the horizontal and vertical displacement of tailings dam locates in middle slope and middle body respectively，which conform with the general deformation pattern of tailings dams. Research result shows that the modified generalized plasticity model can well describe the mechanical deformation properties of tailings sand and can be used for the stress-deformation analysis of tailings dam.

Key words： mining engineering tailings sand triaxial test stress-strain relation generalized plasticity model

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	Articles by authors
	DONG Weixin1
	2
	3
	ZHOU Hanmin1
	2
	CUI Xuan1
	2

Cite this article:

DONG Weixin1,2,3, et al. Research and application of the generalized plasticity model of tailings sand based on critical state theory[J]. , 2017, 36(S2): 3884-3891.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2016.0591 OR https://rockmech.whrsm.ac.cn/EN/Y2017/V36/IS2/3884

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