Seismic Analysis of Gravity Dam–Layered Foundation System Subjected to Earthquakes with Arbitrary Incident Angles

2022 ◽  
Vol 22 (2) ◽  
Author(s):  
Jiawen Zhang ◽  
Mingchao Li ◽  
Shuai Han
Keyword(s):  
Seismic Analysis ◽  
Gravity Dam

A Seismic Wave Oblique Incidence Method and the Application in Gravity DAM Seismic Research

2014 ◽  
Vol 08 (04) ◽  
pp. 1450011 ◽  
Author(s):  
Li Chen ◽  
Liaojun Zhang
Keyword(s):  
Seismic Wave ◽  
Oblique Incidence ◽  
Large Scale ◽  
Seismic Waves ◽  
Seismic Analysis ◽  
Near Field ◽  
P Wave ◽  
Gravity Dam ◽  
Uniform Motion ◽  
Element Analysis

The incidence of seismic wave is generally assumed to be vertical in seismic analysis of large-scale hydraulic structures, but during some near-field earthquakes, the direction of seismic waves is at certain angle to the ground. The non-uniform motion produced by oblique incidence can significantly affect the structures. In this paper, based on the theories of wave motion an oblique P-wave and SV-wave incidence method based on viscous-spring boundary was introduced into finite element analysis, which can accurately simulate the incidence at different oblique angles. Then the proposed method was applied in seismic analysis of a gravity dam located in southwest China. The seismic responses under oblique incidence of P-wave and SV-wave at different oblique angles were discussed. The results indicated that the seismic response was obviously influenced by the oblique incidence, and the traditional vertical incidence was unsuitable for some near-field earthquakes. The oblique incidence should be considered in the seismic analysis of high dams as well as other large-scale water-retaining structures located in seismic regions.

scholarly journals Influences on the Seismic Response of the Gravity Dam-Foundation-Reservoir System with Different Boundary and Input Models

2021 ◽  
Vol 2021 ◽  
pp. 1-15
Author(s):  
Denghong Chen ◽  
Chunping Hou ◽  
Feng Wang
Keyword(s):  
Boundary Conditions ◽  
Seismic Analysis ◽  
Hydrodynamic Pressure ◽  
Point Of View ◽  
Gravity Dam ◽  
Rock Foundation ◽  
Principal Stresses ◽  
Dam Foundation ◽  
Relative Errors ◽  
Viscous Boundary

Dynamic dam-foundation interaction is great important in the design and safety assessment of the dam structures. Two classic boundary conditions, i.e., the viscous-spring boundary and the viscous boundary, are employed to consider the radiation damping of the unbounded rock foundation. The input models of seismic excitation of the viscous-spring boundary and the viscous boundary are derived. The accuracy of the two boundary conditions in the dynamic analysis of the dam foundation is verified through the foundation analysis using an impulsive load. The influences of two boundary conditions and their earthquake input models on the seismic analysis of the Pine Flat and Jin’anqiao gravity dam-foundation-reservoir systems are then investigated. The results of displacements, hydrodynamic pressure, and principal stresses show that the agreement between the results of the viscous-spring boundary and viscous boundary is good. The relative errors of the two models in the Pine Flat and Jin’anqiao gravity dams are both less than 5%. They are both acceptable from an engineering point of view.

scholarly journals Probabilistic Seismic Analysis of the Deep Sliding Stability of a Concrete Gravity Dam-Foundation System

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Hui Liang ◽  
Shengshan Guo ◽  
Yifu Tian ◽  
Jin Tu ◽  
Deyu Li ◽  
...  
Keyword(s):  
Seismic Analysis ◽  
Safety Evaluation ◽  
Gravity Dam ◽  
Seismic Fragility ◽  
Concrete Gravity Dam ◽  
Dam Foundation ◽  
Seismic Safety ◽  
Sample Number ◽  
Seismic Safety Evaluation ◽  
Sliding Stability

There are various uncertainties in the design, construction, and operation of dams. These uncertainties have an important impact on the seismic response and seismic safety evaluation of concrete dams. In this research, a typical nonoverflow monolith of a concrete gravity dam is selected as a case study for the sliding stability analysis. Based on the analysis and demonstration of parameter sensitivity of friction coefficients and cohesion and their influence on the deep antisliding stability of the dam-foundation system, the probabilistic seismic analysis of a gravity dam-foundation system is carried out through Monte Carlo analysis with a large sample number. Damage levels are defined based on the sliding instability failure mode along with the corresponding threshold values of the damage index. Thus, seismic fragility analysis is investigated, and seismic fragility curves are obtained for the vulnerability assessment under earthquake hazards. The overall seismic stability of the gravity dam is evaluated, which provides the basis for the seismic safety evaluation in the probabilistic framework.

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