高应变率下饱水冻结红砂岩变形破坏分析

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Abstract

In order to study the energy transfer rule and deformation regularity of the cretaceous red sandstone，dynamic impact compression test was implemented by 75 mm large diameter SHPB experimental device，the influence of negative temperature change on dynamic strength performance，damage variable and the law of energy dissipation has been analyzed. Meanwhile，the fractal dimension D is introduced to set up the frozen red sandstone blocks broken fractal calculation model，and the relationship between fractal dimension D and fracture energy could be revealed. The results show that dynamic strength of saturated red sandstone under low temperature firstly increases and then decreases with the temperature reduction(25℃–－40℃)，it is very different from the uniaxial experiment results. With the temperature reduced，the tensile fracture area of red sandstone increased initially and then decreased，which indicates that the failure mode is gradually transitioning from tensile failure to shear failure. There is a close relationship between macroscopic failure characteristics and energy absorption，the greater the dissipated energy，the more serious the rock damage. The fracture energy is positively related to the fractal dimension D，the more fracture energy during the process of crushing，the more serious the damage degree，and the number value of corresponding fractal dimension D is bigger，but the growth rate of fractal dimension D is gradually slowing down with the increase of fracture energy .

Key words： rock mechanics low temperature freezing split Hopkinson pressure bar(SHPB) damage variable fractal dimension fracture energy

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	Articles by authors
	YANG Yang1
	WANG Jianguo2
	YANG Renshu3
	FANG Shizheng3
	ZHANG Niannian3
	GUO Yanhui2

Cite this article:

YANG Yang1,WANG Jianguo2,YANG Renshu3, et al. Analysis of deformation and fracture of the saturated frozen red sandstone under high strain rate[J]. , 2018, 37(S2): 4016-4026.

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https://rockmech.whrsm.ac.cn/EN/Y2018/V37/IS2/4016

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