地下工程应力松弛效应的初步理论解

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Abstract Creep and stress relaxation of geo-materials are the two frequently observed time-dependent phenomena in geotechnical engineering. For underground structures，the interaction between support system and surrounding rock or soil mass is influenced not only by the creep of rock or soil mass，but also by the stress relaxation. Based on a modified nonlinear creep model，a theoretical solution to an equivalent creep problem is proposed to describe the stress relaxation of circular caverns embedded in viscoelastic geo-materials. The dimensionless expression is also presented. Two types of soils are employed in case studies. The results show that the stress relaxation characteristics of geo-materials can be described by the parameters in the creep law；the design for long-term stability of lining without consideration of stress relaxation in rock or soil mass is safer than that in practice. In the view of energy conservation，stress relaxation can be considered as a decreasing process of concentrated ground stress，which is induced by excavation of caverns. The process is dependent on the initial condition and mechanical properties of material and influenced by time and space. Furthermore，the evolution of inner microstructure is reverse to that of creep. The study results can not only be applied to engineering applications directly，but also be helpful in understanding of rheological behavior of geo-materials.

Key words： rock mechanics circular tunnel stress relaxation creep theoretical solution application

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	Articles by authors
	WANG Zhechao1
	CHEN Weizhong2
	QIAO Liping3
	ZHANG Lewen1

Cite this article:

WANG Zhechao1,CHEN Weizhong2,QIAO Liping3, et al. PRELIMINARY STUDY OF THEORETICAL SOLUTION TO STRESS RELAXATION EFFECT FOR UNDERGROUND ENGINEERING[J]. , 2010, 29(S2): 4096-4101.

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https://rockmech.whrsm.ac.cn/EN/Y2010/V29/IS2/4096

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