Constitutive model for damage of freeze-thaw rock under three-dimensional stress

被引：0

作者：

Zhang H.-M. ^{[1
]}

Xie X.-M. ^{[1
,2
]}

Peng C. ^{[1
]}

Yang G.-S. ^{[3
]}

Ye W.-J. ^{[3
]}

Sheng Y.-J. ^{[3
]}

机构：

[1] Department of Mechanics, Xi'an University of Science and Technology, Xi'an

[2] Infrastructure Construction Co., Ltd., Guangxi Construction Engineering Group, Nanning

[3] College of Architecture and Civil Engineering, Xi'an University of Science and Technology, Xi'an

来源：

| 1600年 / Chinese Society of Civil Engineering卷 / 39期

关键词：

Confining pressure; Damage constitutive model; Experiment; Freeze-thaw cycle; Model parameter;

D O I：

10.11779/CJGE201708011

中图分类号：

学科分类号：

摘要：

Considering the random characteristics of defects of rock materials, the model for damage of freeze-thaw and loaded rock considering the influence of confining pressure is established based on the theory of continuum damage mechanics. According to the geometric condition of the deformation and failure curve of red sandstone, the expressions for model parameters containing only the basic characteristic parameters of rock are determined. The rationality of the model is verified by the experiments on mechanical characteristics of rock under freeze-thaw cycls. It is shown that the crack-dominated micro mechanical response of the red sandstone is consistent with the macroscopic deformation and failure characteristics. The damage degree of sandstone, which is shown as the deterioration of the mechanical properties of the materials in the macroscopic performance, increases with the increase of the number of freeze-thaw cycles. But the strain of rock increases and the plastic property increases with the same damage degree at the later stage of deformation. The confining pressure can improve the stress state of rock, so the damage degree decreases with the increase of the confining pressure, which is shown as the strength of the materials to resist damage and the increase of plastic deformation. © 2017, Editorial Office of Chinese Journal of Geotechnical Engineering. All right reserved.

引用

页码：1444 / 1452

页数：8

共 19 条

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