Abstract
Based on the dynamic damage constitutive model of concrete material and seismic rock-lining structure interaction analysis method, the seismic response of lining structure in large underground powerhouse is studied in this paper. In order to describe strain rate dependence and fatigue damage of concrete material under cyclic loading, a dynamic constitutive model for concrete lining considering tension and shear anisotropic damage is presented, and the evolution equations of damage variables are derived. The proposed model is of simple form and can be programmed into finite element procedure easily. In order to describe seismic interaction characteristics of the surrounding rock and lining, an explicit dynamic contact analysis method considering bond and damage characteristics of contact face between the surrounding rock and lining is proposed, and this method can integrate directly without iteration. The proposed method is applied to seismic stability calculation of Yingxiuwan Underground Powerhouse, results reveal that the amplitude and duration of input seismic wave determine the damage degree of lining structure, the damage zone of lining structure is mainly distributed in its arch, and the contact face damage has great influence on the stability of the lining structure.
Highlights
More than a dozen large-scale underground powerhouses of hydropower stations are located in the high seismic area of Southwest China, and their stability under seismic action is essential for the safe operation of hydropower stations
Dynamic constitutive model of concrete material is the basis for dynamic analysis of lining structure in underground powerhouse
The method is used in the seismic damage analysis of lining structure in Yingxiuwan Underground Powerhouse; it concludes the following
Summary
More than a dozen large-scale underground powerhouses of hydropower stations are located in the high seismic area of Southwest China, and their stability under seismic action is essential for the safe operation of hydropower stations. Because the seismic interaction of surrounding rock and lining structure is of complex nonlinear characteristics, a Mathematical Problems in Engineering large number of nonlinear calculations, as well as higher demands for both the seismic contact analysis model and solving algorithm, are needed. It has been a difficult problem in the dynamic response analysis of lining structure in underground powerhouse. Combined with the proposed explicit dynamic contact analysis method considering bond and damage characteristics of contact face between lining and surrounding rock, a dynamic response analysis method of concrete lining structure in underground powerhouse is constructed. The results provide references for seismic design of concrete lining in large underground powerhouse
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