Study on mechanical properties and finite deformation constitutive model of red sandstone subjected to temperature-water-mechanics coupling

被引：0
|
作者：
Gao Y. [1 ,2 ]
Yan W. [1 ,2 ]
Gao F. [1 ,2 ]
Wang Z. [1 ,2 ]
Zhang Z. [1 ,2 ]
机构：
[1] State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou, 221116, Jiangsu
[2] School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou, 221116, Jiangsu
来源：
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | 2019年 / 38卷
基金：
国家重点研发计划; 中国国家自然科学基金;
关键词：
Confining pressure; Constitutive equation; Finite deformation; Immersion time; Rock mechanics;
D O I：
10.13722/j.cnki.jrme.2017.1119
中图分类号：
学科分类号：
摘要：
Temperature, underground water and in situ stress are crucial environmental factors affecting rock strength and deformability during deep mining. In this study, temperature water immersion time-confining pressure coupled compression experiments of red sandstone is designed and conducted based on the orthogonal experimental principles. The effects of each influencing factor on red sandstone strength and deformability are statistically analyzed and discussed. The results indicate that the temperature, water immersion time and confining pressure have great influence on the elastic modulus, Poisson's ratio and peak strength(significance level≥90%). The confining pressure has the most significant effects while the temperature has the least effects on these three parameters. The evolution of elastic modulus, Poisson's ratio and peak strength under the influence of the three environmental factors is also studied. The linear correlations of those parameters with the three factors are obtained. Furthermore, based on the finite deformation theory, the mean rotation angle are employed to analyze the nonlinear deformation behavior of the test rock. The evolution of the mean rotation angle are studied and discussed. A constitutive model based on the mean rotation angle and finite deformation theory is also proposed. The comparison of model results and experimental data shows that the model proposed in this study can well describe the deformation and failure process of the red sandstone. © 2019, Science Press. All right reserved.
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页码：2734 / 2747
页数：13
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