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结构面泥岩非线性蠕变特性试验研究
Experimental study on nonlinear creep properties of mudstone with structural plane
投稿时间: 2016-09-30  最后修改时间: 2016-12-04
DOI:
中文关键词:  结构面泥岩  单轴蠕变试验  非线性粘滞体  蠕变模型
英文关键词:mudstone with structural surface  uniaxial compressive creep test  nonliner viscous body  creep model
基金项目:国家自然科学基金项目(面上项目)
作者单位E-mail
刘晓林 辽宁工程技术大学 1251601082@qq.com 
苏荣华 辽宁工程技术大学 suronghua2006@163.com 
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中文摘要:
      利用自制蠕变试验装置对含有平直闭合结构面的泥岩试样进行单轴蠕变试验研究。结果表明:轴向应力为8~12 MPa时,结构面泥岩蠕应变与总应变比值呈线性增加;随着轴向应力增加,蠕应变与总应变比值突变呈上凹型增加,继而呈上凸型变化;结构面泥岩蠕变速率随轴向应力增加衰减显著,与时间为负指数关系。为描述不同轴向应力下结构面泥岩蠕变规律,提出一种非线性元件-与时间呈负指数关系的非线性黏滞体,与Burgers模型相结合,构建结构面泥岩法向非线性蠕变模型,并进行参数辨识及拟合分析。分析发现改进的Burgers模型能很好地描述结构面泥岩的法向非线性蠕变特性。
英文摘要:
      Structure face has an important influence on rock creep properties. The uniaxial creep experiments were carried out by self-made creep experimental device for mudstones with straightly structural face. The results show that the ratio of creep strain to total strain, mudstone with structural face increses linearly, increases in the range of 8~12 MPa. With the increase of axial stress, ratio of creep strain to total strain of mudstone increases nonlearly, then changes in contex. Creep rate of mudstone with structural plane has a negative exponent relation with time. In order to describe the creep characteristics of mudstone with structural plane under different axial stress, a kind of nonlinear element - nonlinear viscous body, having a negative exponential relation with time, is combined with the Burgers model. Then construct a nonlinear creep model of mudstone with structural plane, which is identified and fitted. The improved Burgers model can well describe the creep characteristics of the mudstone with structural plane .
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