中等蚀变结构面剪切变形破坏特性及统计损伤模型

doi:10.13722/j.cnki.jrme.2022.0077

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Abstract Altered rock masses often lead to deterioration of physical and mechanical properties obviously. The associated distribution of alteration along the structural plane is a common geological phenomenon in altered rock strata，which will have an important impact on the stability of surrounding rock of underground engineering. The natural altered structural planes with the same degree of alteration，filling thickness and rock disk roughness，existing in the surrounding rocks of the underground powerhouse cavern groups of Fengning Pumped Storage Power Station in Hebei Province China，were selected to carry out the shear characteristics test and acoustic emission(AE) monitoring. The shear deformation and strength characteristics，failure mode and AE energy evolution law of natural moderate altered structural planes were analyzed. A shear statistical damage model based on the AE energy law of the natural structural planes was established，and the effects of model parameters on shear deformation and strength were analyzed. The results show that：(1) Shear stress has an effect on both normal and tangential deformation，and dilatancy effect occurs at the late shear stage before the specimen is about to fail；the failure mode of the structural planes is mainly manifested as failure along the filling material，dissociating and crushing of massive particles，and finally shear sliding；(2) AE is released in the whole shear process of natural altered structural planes，it bursts when stress changes and tends to be calm after stress balanced，and active suddenly before shear failure. The whole test process can be divided into compaction stage，dissociation stage，crushing stage and slip stage；(3) With the AE energy sequence of natural structural planes? shear process to define the damage variable and assuming the micro elements among the structural plane obey Weibull distribution，a shear statistical damage model of natural structural planes was derived，which is in good rationality and adaptability with the experimental results.

Key words： rock mechanics natural altered structural planes shear deformation characteristics failure mode evolution of acoustic emission shear statistical damage model

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	Articles by authors
	DING Xiuli
	LIU Tongling
	HUANG Shuling
	ZHANG Yuting

Cite this article:

DING Xiuli,LIU Tongling,HUANG Shuling, et al. Shear deformation characteristics and statistical damage model of moderately altered structural planes[J]. , 2022, 41(11): 2161-2172.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2022.0077 OR http://rockmech.whrsm.ac.cn/EN/Y2022/V41/I11/2161

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