Experimental study on mechanical properties of Cretaceous red sandstone under different freezing temperatures and confining pressures

被引：0
|
作者：
Liu B. [1 ,2 ]
Ma Y. [1 ]
Sheng H. [1 ]
Deng H. [1 ]
Han Q. [1 ]
Cao Y. [1 ]
机构：
[1] School of Mechanics and Civil Engineering, China University of Mining and Technology(Beijing), Beijing
[2] State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology(Beijing), Beijing
来源：
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | 2019年 / 38卷 / 03期
基金：
中国国家自然科学基金;
关键词：
Confining pressure; Cretaceous; Frozen red sandstone; Mechanical parameters; Rock mechanics; Temperature;
D O I：
10.13722/j.cnki.jrme.2018.0780
中图分类号：
学科分类号：
摘要：
Rock masses in the frozen wall are subjected to coupling actions of the temperature and the crustal stress during the construction of mine shafts using the artificial freezing technology. To investigate the mechanical properties of Cretaceous red sandstone after freezing under the coupling action of the crustal stress and the temperature, triaxial compression tests with frozen samples were carried out under different temperatures of 20℃, -5℃, -10℃ and -15℃ and different confining pressures of 0, 2, 4, 6 and 8 MPa, and the influence of the confining pressure and the temperature on the mechanical properties of red sandstone during freezing process was discussed. Test results demonstrate that the confining pressure during the freezing process enhances the freezing effect modestly, namely, compared with the case without the confining pressure during the freezing process, the strength and the elastic modulus of the red sandstone increase while Poisson's ratio decreases. With decreasing the temperature, the cohesion, the internal friction angle, the crack initiation and dilatation stresses of the red sandstone increase, and the cohesion has a higher sensibility to the temperature. It is also revealed that, after freezing, the red sandstone has a comparative longer elastic stage and the reserve capacity for plastic deformation is not adequate. The crustal stress enhances the restraining capacity of pores so as to resist the damage caused by the frost heaving force, which makes the freezing action develop to the secondary micro-cracks. The study results help for the design of the thickness of the frozen wall and the section height of mine shafts in Western China. © 2019, Science Press. All right reserved.
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页码：455 / 466
页数：11
相关论文
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