4.7 Article

Shear creep mechanical properties and damage model of mudstone in open-pit coal mine

期刊

SCIENTIFIC REPORTS
卷 12, 期 1, 页码 -

出版社

NATURE PORTFOLIO
DOI: 10.1038/s41598-022-08488-3

关键词

-

资金

  1. National Natural Science Foundation of China [51874160]
  2. Liaoning BaiQianWan Talents Program, Basic Research Projects of Colleges and Universities in Liaoning Province [LJKQZ2021155]
  3. Discipline Innovation Team of Liaoning Technical University [LNTU20TD-01]
  4. College Student Innovation and Entrepreneurship Training Program [202110147011]

向作者/读者索取更多资源

This study clarifies the shear creep characteristics of rock and establishes a new nonlinear shear creep damage model. The model can better describe the creep characteristics of rock under different normal and shear stresses, with superior performance in describing the accelerated creep stage compared to the classical model. The model has high agreement with experimental data, confirming its accuracy and rationality. The influence of model parameters on rock creep deformation is analyzed.
Clarifying the shear creep characteristics of rock and scientifically analyzing its creep deformation law is the key to solving the problem of safe construction and long-term stability analysis of the open-pit coal slope rock mass. Shear creep tests were carried out on mudstone from an open-pit coal mine in Eastern Mongolia to reveal the creep characteristics of mudstone under different normal and shear stresses. Based on the classical Nishihara model, a new composite six-element nonlinear shear creep damage model is established by introducing nonlinear elastomers. Using the least square method, model verification and parameter identification are carried out on the variable test data. At the same time, the influence law of the model parameters on the rock creep deformation is analyzed according to the theoretical curve. The study results showed that the nonlinear shear creeps damage model could better describe the creep characteristics of rock different normal stress and shear stress levels, significantly the non-linear both the strain and time of attenuation creep and accelerated creep. The creep characteristics of the accelerated creep stage described by this model are better than those described by the classical Nishihara model. The model curve is consistent with the changing trend of the experimental data, and the degree of agreement is very high. The correlation coefficients are all above 0.98, which verifies the accuracy and rationality of the model. The influence law of creep parameters is analyzed. The parameters b and c increase nonlinearly with creep. The increase of lambda accelerates the process of rock attenuation creep stage; the increase of eta(10) slows down the progress of rock decay creep stage; with the increase of alpha, the deformation and creep rate of rock in accelerated creep stage gradually increase. When eta(2) increases, the deformation in the acceleration stage decreases gradually. The research results can provide important theoretical support for the safe construction and long-term stability analysis of open-pit coal slope rock masses.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.7
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据