Constitutive model of rock compaction stage based on contact theory

被引：3
|
作者：
Ma Q. [1 ]
Qin Y. [1 ]
Zhou T. [1 ]
Yang X. [1 ]
机构：
[1] School of Emergency Management and Safety Engineering, China University of Mining and Technology (Beijing), Beijing
来源：
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | 2019年 / 50卷 / 08期
基金：
中国国家自然科学基金;
关键词：
Compaction stage; Constitutive model; Contact theory; Normal distribution; Rock mechanics;
D O I：
10.11817/j.issn.1672-7207.2019.08.022
中图分类号：
学科分类号：
摘要：
Considering that the nonlinear deformation in the compaction stage of rock is related to the contact between the particles in the rock, a G-W contact model based on the normal distribution of concave convex body was introduced and then the contact element model was established. The constitutive model of the compaction stage was established by connecting the model with the spring element in series. The element model was used to simulate the experimental results, and the parameters of the model were analyzed. The results show that both the aperture of rock particles and the roughness of the particle surface have certain effects on the constitutive relationship of rock compaction stage. The larger the aperture degree between particles is, the longer time the compaction process takes. Under the same strain condition, the greater the roughness is, the slower the stress growth is. In the process of simulating the constitutive relationship of four rock compaction stages, the goodness of fit of the model is greater than 0. 95. The proposed model can accurately describe the stress-strain relationship of rock. At the same time, the model reflects the influence of confining pressure on the constitutive relationship, which verifies that it is reasonable to use contact model to describe the constitutive relationship in the compaction stage. © 2019, Central South University Press. All right reserved.
引用
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页码：1941 / 1948
页数：7
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