不同围压与冻结温度下白垩系红砂岩力学性质试验研究

doi:10.13722/j.cnki.jrme.2018.0780

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Abstract 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.

Key words： rock mechanics Cretaceous frozen red sandstone confining pressure temperature mechanical parameters

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	Articles by authors
	LIU Bo1
	2
	MA Yongjun1
	SHENG Hailong1
	DENG Helang1
	HAN Qian1
	CAO Yingjie1

Cite this article:

LIU Bo1,2,MA Yongjun1, et al. Experimental study on mechanical properties of Cretaceous red sandstone under different freezing temperatures and confining pressures[J]. , 2019, 38(3): 455-466.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2018.0780 OR http://www.rockmech.org/EN/Y2019/V38/I3/455

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