茂木式真三轴试验机的端部摩擦效应

doi:10.13722/j.cnki.jrme.2017.1179

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Abstract Due to the rigid platens used in Mogi type of true-triaxial test apparatus，the friction between the loading platens and samples enhances the measured strength of material. In order to quantitatively estimate the end effect，the biaxial compression tests on the red sand stone samples were conducted under different interface frictions and intermediate stress conditions. The measured strengths of samples under different interface frictions differ significantly. When the friction coefficients of interface increase from 0.12 to 0.28，the maximum stresses of samples under the same intermediate stress increase 5.5% to 43%. Several yielding criteria were used to estimate the end effect and the strain energy criterion was adopted for further analysis. An expression for end effect was established and the intermediate stress effect curves considering end effect were drawn in coordinate. The influence of end friction on the curve?s shape was revealed to agree well with test results.

Key words： rock mechanics true-axial test machine end friction effect biaxial compression yielding criterion

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	Articles by authors
	FAN Pengxian
	LI Ying
	ZHAO Yuetang
	DONG Lu
	MA Linjian

Cite this article:

FAN Pengxian,LI Ying,ZHAO Yuetang, et al. End friction effect of Mogi type of true-triaxial test apparatus[J]. , 2017, 36(11): 2720-2730.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2017.1179 OR http://www.rockmech.org/EN/Y2017/V36/I11/2720

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