富水软岩流变扰动效应实验及本构模型研究

于永江1,刘峰1,2,张伟1,张国宁1

振动与冲击 ›› 2019, Vol. 38 ›› Issue (12) : 199-205.

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PDF(1462 KB)
振动与冲击 ›› 2019, Vol. 38 ›› Issue (12) : 199-205.
论文

富水软岩流变扰动效应实验及本构模型研究

  • 于永江1,刘峰1,2,张伟1,张国宁1
作者信息 +

An experimental study on tbe rheological perturbation effect and a constitutive model of water-rich soft rock 

  • YU Yongjiang1,LIU Feng1,2,ZHANG Wei1,ZHANG Guoning1
Author information +
文章历史 +

摘要

动力扰动下的深部富水软岩巷道流变变形量大,变形速率快是导致巷道支护困难和发生蠕变型冲击地压的主要原因。为了研究富水软岩在动力扰动下蠕变特性及本构模型,采用自主研发的岩石流变扰动效应实验仪对不同含水率软岩进行分级加载流变扰动效应试验,实验结果表明:施加扰动的瞬间软岩都会出现变形突然增大,随后该变形值会有不同程度的回弹,最后在此基础上变形持续发展;当应力水平较小和含水率不高的情况下,扰动变形速率随着扰动能量的增加而缓慢增大,而当应力水平较高和含水率较大时,扰动变形速率随着扰动能量的增加快速增大,使岩石试件迅速破坏;推导了扰动能量的扰动状态方程,在此基础上建立了富水软岩流变扰动效应本构模型,并对参数进行识别与验证;模型拟合曲线与实验值吻合效果良好,验证所建模型可正确描述动力扰动下富水软岩蠕变特性,该成果可为今后展开此类问题的研究提供一定的参考。

Abstract

Deep water-rich soft rock roadway under dynamic disturbance has the characteristics of large rheological deformation and rapid deformation rate, which is the main reason for the difficulty of roadway support and the creep-induced rock bursts.In order to study the creep failure characteristics and a constitutive model of water-rich soft rock under dynamic disturbance, the stage-loading creep test of soft rock with different moisture content was conducted by a self-developed rock disturbance creep experiment system.The results show that: The deformation of the soft rock increases suddenly when the disturbance is applied, and then the deformation rebounds from different degrees.Finally, the deformation continues developing on this basis.The disturbance deformation rate increases slowly with disturbance energy under less stress level and low moisture content.On the contrary, the perturbation deformation rate increases rapidly with perturbation energy under high stress level and high moisture content, which lead to failure of rock specimens.The constitutive model of rheological perturbation effect of water-rich soft rock was established based on the perturbation state equation of perturbation energy and model parameters were identified.The model fitting curves agree well with the experimental curves, which verified that the model can be described correctly in rich water soft rock creep properties under dynamic disturbance.

关键词

软岩 / 含水率 / 流变扰动效应 / 扰动能量 / 扰动状态方程 / 本构模型

Key words

soft rock / moisture content / rheological perturbation effect / perturbation energy / perturbation state equation;constitutive model

引用本文

导出引用
于永江1,刘峰1,2,张伟1,张国宁1. 富水软岩流变扰动效应实验及本构模型研究[J]. 振动与冲击, 2019, 38(12): 199-205
YU Yongjiang1,LIU Feng1,2,ZHANG Wei1,ZHANG Guoning1 . An experimental study on tbe rheological perturbation effect and a constitutive model of water-rich soft rock [J]. Journal of Vibration and Shock, 2019, 38(12): 199-205

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