高应力泥质粉砂岩蠕变特性及长期强度研究

doi:10.13722/j.cnki.jrme.2019.0279

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Abstract Creep behavior of rocks under high stresses is one of the hot issues in the study of deep buried chamber stability. To study creep characteristics and long-term strength of argillaceous siltstone under high stresses， triaxial compression rheological tests were carried out on argillaceous siltstone specimens under graded incremental loading. The experiment results show that the creep of argillaceous siltstone has viscoelastic characteristics under low stresses and elastoviscoplastic characteristics under high stresses. Based on separating instantaneous elastic strain，viscoelastic creep and viscoplastic creep from the total creep of argillaceous siltstone under high stresses，the functional relationship between the steady viscoplastic creep rate and the stress was established. It is suggested that the threshold stress corresponding to the steady-state viscoplastic creep rate can be regarded as the long-term strength of argillaceous siltstone under high stresses. It is also shown that the long-term strength of argillaceous siltstones under high stresses，determined by the developed function between the steady viscoplastic creep rate and the stress，is 70.5% of the uniaxial compressive strength. The research provides a reasonable method for determining the long-term strength of rocks under high stresses.

Key words： rock mechanics argillaceous siltstone creep long-term strength creep rate

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	Articles by authors
	LIU Xinxi1
	2
	LI Shengnan1
	2
	ZHOU Yanming1
	LI Yu1
	WANG Weiwei1

Cite this article:

LIU Xinxi1,2,LI Shengnan1, et al.

Study on creep behavior and long-term strength of argillaceous #br# siltstone under high stresses

[J]. , 2020, 39(1): 138-146.

URL:

http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2019.0279 OR http://www.rockmech.org/EN/Y2020/V39/I1/138

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