拱坝坝肩岩石流变力学特性试验研究及其长期稳定性分析

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Abstract In order to understand the rheological properties of alteration rock specimen of two banks of Xiaowan hydropower station，triaxial compression rheological experiments on alteration rock specimens are carried out by the rock servo-controlled rheological testing machine. The test results show that the rheological properties of alteration rock are very significant，and the rheological deformation of specimens is large. Based on the triaxial rheological experimental results，the variation law of axial strains of alteration rock specimens with time is investigated. At the same time，the variation tendency of axial rheological rates under different stress levels is discussed in detail；the rheological failure mechanism is analyzed；and the triaxial rheological law of alteration rock specimen is obtained. Cvisc rheological model is used to fit the rheological test curves，and the constitutive relationships of Cvisc model and its parameters are obtained. Based on the optimal rheological model of rock，the rheological mechanical behaviors of rock mass on two banks are simulated by using 3D nonlinear numerical method. Throughout the analysis of the calculated results，the long-term stability of arch dam and abutment are estimated by studying the displacement and stress. The results show that the rheological effect of Xiaowan hydropower station is very remarkable. The rheological deformations of arch dam and two banks are larger than the elastoplastic deformations. Considering the rock rheological behavior，the stress field will redistribute with the increase in time；and the phenomenon of local stress concentration will decrease. The abutment rock mass expresses explicit rheological characteristics at the beginning of loading，and then，the rheological rate and rheological deformation of arch dam and abutment tend to stability.

Key words： rock mechanics Xiaowan hydropower station alteration rock experimental study abutment rock mass long-term stability numerical analysis

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	Articles by authors
	JIANG Yuzhou1
	2
	XU Weiya1
	WANG Ruihong3
	WANG Rubin1
	ZHANG Zhiliang1

Cite this article:

JIANG Yuzhou1,2,XU Weiya1, et al. EXPERIMENTAL STUDY OF RHEOLOGICAL MECHANICAL PROPERTIES OF ARCH DAM ABUTMENT ROCK AND ITS LONG-TERM STABILITY ANALYSIS[J]. , 2010, 29(S2): 3699-3709.

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https://rockmech.whrsm.ac.cn/EN/Y2010/V29/IS2/3699

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