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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摘要

为了建立更加准确合理的尾矿砂材料本构模型，结合试验结果对一种弹塑性砂土本构模型进行改进。基于尾矿砂三轴剪切试验结果，引入基于临界状态理论和状态参数，提出一种适用于尾矿砂的改进Pastor-Zienkiewicz III广义塑性模型。三轴试验结果和模型拟合结果对比表明，模型能有效反映尾砂主要应力–应变特性，克服原模型不能反映围压影响的缺陷。与Duncan-Chang模型相比，改进模型可以描述尾矿砂抗剪强度的应变软化效应和低围压下的剪胀特性等。最后将提出的模型初步应用于尾矿坝的有限元应力变形分析，尾矿坝水平位移趋向下游，最大值位于坝坡中部，沉降最大值位于坝体中部。计算结果表明，尾矿坝应力变形规律性良好，符合一般规律，改进广义塑性模型可以应用于尾矿坝的应力变形有限元分析中。

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关键词 ：采矿工程；尾砂；三轴试验；应力&ndash, 应变关系；广义塑性模型

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

引用本文:

董威信1，2，3，周汉民1，2，崔旋1，2. 基于临界状态理论的尾砂广义塑性模型研究及其应用[J]. 岩石力学与工程学报, 2017, 36(S2): 3884-3891.
DONG Weixin1，2，3，ZHOU Hanmin1，2，CUI Xuan1，2. Research and application of the generalized plasticity model of tailings sand based on critical state theory. , 2017, 36(S2): 3884-3891.

链接本文:

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

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