不同粗糙度结构面时效强度特征

doi:10.13722/j.cnki.jrme.2016.0018

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Abstract To study the time-dependent behavior of rock mass discontinuity，the samples with artificial joint surfaces based on Barton′s ten standard lines were poured using cement mortar. Direct shear test and shear creep test were conducted and the relationship between shear strength and JRC(joint roughness coefficient) was established，the characteristics of creep curves were described and the long-term strength of discontinuities with different values of JRC and normal stress were solved using new method for determining the long-term strength that proposed based on the isocreep-rate curve. The results demonstrate that the creep displacement decreased and the creep failure curves were steeper and steeper with the increasing of JRC. The creep displacement，creep rate and shear stiffness in loading section of muti-stage creep curves increased greatly when the shear stress was higher than stress thresholds. Instantaneous strength and long-term strength have linear relationship with JRC，and the ratio of long-term strength and instantaneous strength decreased with the increasing of JRC，which due to the difference between continuous rock and rock mass discontinuity in time-dependent behavior and the variation of shear area ratio. In addition，the long-term strength determined by inflection point of isocreep-rate curve method meet the range determined by the creep characteristics which can verify the reliability and rationality of the new method.

Key words： rock mechanics time-dependent strength shear area ratio creep

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	Articles by authors
	WANG Zhen1
	SHEN Mingrong1
	2
	TIAN Guanghui1
	ZHANG Qingzhao1
	2

Cite this article:

WANG Zhen1,SHEN Mingrong1,2, et al. Time-dependent strength of rock mass discontinuity with different values of JRC[J]. , 2017, 36(4): 3287-3296.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2016.0018 OR https://rockmech.whrsm.ac.cn/EN/Y2017/V36/I4/3287

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