层间错动带剪切蠕变试验及蠕变模型研究

doi:10.13722/j.cnki.jrme.2020.0881

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Abstract The interlayer shear weakness zone(ISWZ) is a typical weak structural plane which controls the safety and stability of the dam foundation and underground caverns in Baihetan Hydropower Station. It is very important for the long-term stability of engineering surrounding rock mass to study the time-dependent mechanical effects. However，from the existing research results，there is little research on the creep characteristics of ISWZs in Baihetan. In this paper，the creep characteristics of undisturbed ISWZs¢ specimens in the Baihetan engineering area are studied through direct shear creep tests. The experimental results show that the undisturbed specimens of ISWZs present typical creep characteristics. The long-term shear strength of the ISWZs under various normal stresses is determined by isochronous curve cluster method. Finally，based on the element method and the yield surface creep model，a non-stationary viscoelastic-plastic creep model which can describe the instantaneous elasticity，stable creep and accelerated creep characteristics of ISWZs is established. The fitting results show that this creep model can well reflect the creep characteristics of ISWZs. The research results can provide a reference for further revealing the time-dependent law of ISWZs.

Key words： rock mechanics interlayer shear weakness zones direct shear creep experiments creep characteristics long-term strength non-stationary viscoelastic-plastic constitutive model

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	Articles by authors
	HAN Gang1
	2
	HOU Jing3
	ZHOU Hui1
	2
	ZHANG Chuanqing1
	2
	GAO Yang1
	2
	YANG Liu1
	2
	CHEN Pingzhi3

Cite this article:

HAN Gang1,2,HOU Jing3, et al. Shear creep experimental study on constitutive model of interlayer shear weakness zones[J]. , 2021, 40(5): 958-971.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2020.0881 OR https://rockmech.whrsm.ac.cn/EN/Y2021/V40/I5/958

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