Study of non-stationary viscoelastic stress relaxation model of rocks

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Study of non-stationary viscoelastic stress relaxation model of rocks

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- Study of non-stationary viscoelastic stress relaxation model of rocks
- Advanced Engineering Sciences Vol. 47, Issue Z2, Pages: 54-60(2015)
- 作者机构：
  
  华北水利水电大学
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published：2015，
  
  Published Online：1 December 2014，
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于怀昌.“研究生论坛”稿件-岩石非定常黏弹性应力松弛本构模型研究[J].工程科学与技术,2015,47(Z2):54-60.

yuhuaichang. Study of non-stationary viscoelastic stress relaxation model of rocks. [J]. Advanced Engineering Sciences 47(Z2):54-60(2015)
于怀昌.“研究生论坛”稿件-岩石非定常黏弹性应力松弛本构模型研究[J].工程科学与技术,2015,47(Z2):54-60. DOI：

yuhuaichang. Study of non-stationary viscoelastic stress relaxation model of rocks. [J]. Advanced Engineering Sciences 47(Z2):54-60(2015) DOI：

摘要

中文摘要: 采用RLJW–2000岩石三轴流变伺服仪，对粉砂质泥岩进行了三轴压缩应力松弛试验。基于试验结果，首先采用定常Hooke-Kelvin模型描述岩石的应力松弛特性，分析了参数定常情况下模型拟合值与试验值之间的差别，表明不考虑参数的时间相关性将引起较大的误差，有必要建立岩石的非定常应力松弛模型。以Hooke-Kelvin模型为基础，将黏弹性模量G2、黏滞系数H1看作是与时间有关的非定常参数，得出了两种模型参数随时间的变化关系，建立了三维应力下岩石的非定常黏弹性Hooke-Kelvin应力松弛模型。对比模型拟合结果与试验结果，非定常黏弹性Hooke-Kelvin应力松弛模型比定常模型能更准确地反映粉砂质泥岩的应力松弛特性。研究成果可为今后开展此方面的工作提供有益参考依据。

Abstract

Abstract:The stress relaxation tests of silty mudstone under triaxial compression are performed with the RLJW–2000 rock servo-controlled rheology testing machine. Based on the test results

the stationary Hooke-Kelvin model is first selected to describe the stress relaxation properties of silty mudstone. In accordance with the difference between the theoretical results of stationary model and the test results

it can be seen that large errors will be encountered without considering time-dependent behaviors of the parameters

so it is necessary to establish the non-stationary model of rocks. By constructing the relation between model parameters G2、H1 and the time

a three-dimensional non-stationary viscoelastic Hooke-kelvin model is established. Comparing the theoretical results of stationary and non-stationary models with the test results

it is shown that the non-stationary viscoelastic Hooke-kelvin model can more accurately reflect the stress relaxation properties of silty mudstone than the stationary model. The research can provide some references for the future study of the stress relaxation model of rocks.

关键词

粉砂质泥岩应力松弛黏弹性非定常Hooke-Kelvin模型

Keywords

silty mudstonestress relaxationviscoelasticitynon-stationary Hooke-kelvin model

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Experimental study of creep properties of silty mudstone under triaxial compression

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