两种岩石试件的“超声–回弹–密度”综合筛选法研究

doi:10.13722/j.cnki.jrme.2016.1247

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Abstract

In order to avoid the discreteness in laboratory test of rock mechanics，with the current prevailing technology of non-destructive testing，in view of the Hertz contact theory and energy conservation law，and based on the principle of rebound detection，the mechanism of rock-strength prediction by “ultrasonic- rebound-density” comprehensive screening method is studied，and multiple regression models are established concerning the relationships of rock uniaxial compressive strength with density，rebound and compressional wave velocity. Thus combined with stratigraphic CT scanning technique，a new method to predict the compressive strength of rock mass is put forward. Then after the non-destructive testing of granite and sandstone，this paper obtained their predicted compressive strength with the models mentioned above. The predicted results deviate from the results obtained by lab test by no more than －2.53% to 2.06% and 3.09% to 4.84%，and the correlation coefficients of the two fitting formulas are both more than 0.9. Conclusions are that this method is much more accurate than previous empirical formulas and can provide reference for rock grouping under different working conditions，and the prediction error of the grouped rock samples ranges from －5% to +5%.

Key words： rock mechanics；granite；sandstone；“ultrasonic - rebound-density&rdquo comprehensive method；contact theory；strength prediction

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	Articles by authors
	WANG Zijuan1
	2
	LIU Xinrong1
	FU Yan3
	YUAN Wen1
	MIAO Luli1

Cite this article:

WANG Zijuan1,2,LIU Xinrong1, et al. Comprehensive screening method of “ultrasonic-rebound-density” for two kinds of rock specimens[J]. , 2018, 37(S1): 3575-3583.

URL:

https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2016.1247 OR https://rockmech.whrsm.ac.cn/EN/Y2018/V37/IS1/3575

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