岩石压缩特性的率效应与动态增强因子统一模型

doi:10.13722/j.cnki.jrme.2017.1239

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Abstract In order to investigate the rate effect of rock material in the loading range of“static-quasi static-dynamic”and to overcome the shortcomings of the size effect in static loading and dynamic loading methods，on the basis of comprehensive analysis in eliminating the end effect in static test and achieving the force balance for dynamic test specimen，a cylindrical fine granite specimen with ?25 mm×50 mm was adopted. The compression tests were carried out in the range of static-quasi-static-dynamic by using the hydraulic servo tester INSTRON and SHPB(split Hopkinson pressure bar) device respectively. The variations of compressive strength，peak strain and tangent modulus with strain rate(loading rate) were obtained. The relationship between the strain rate and the loading rate was also investigated using the obtained experimental data，and the results show that there is a good linear relationship between them(taking logarithm respectively). In order to describe the rate effect of rock material from low to high loading rate(or strain rate)，a new model of dynamic increase factor(DIF) based on rate effect was proposed，and the applicability of the model to the compressive strength，tangent modulus and peak strain were investigated by using the strain rate and loading rate as the basic parameters respectively. The results show that the new model of DIF based on the loading rate effect can describe well the rate effect of compressive strength and tangent modulus.

Key words： rock mechanics rate effect dynamic increase factor(DIF) loading rate strain rate compressive strength

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	Articles by authors
	GONG Fengqiang1
	2
	WANG Jin1
	LI Xibing1

Cite this article:

GONG Fengqiang1,2,WANG Jin1, et al. The rate effect of compression characteristics and a unified model of dynamic increasing factor for rock materials[J]. , 2018, 37(7): 1586-1595.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2017.1239 OR https://rockmech.whrsm.ac.cn/EN/Y2018/V37/I7/1586

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