Abstract
Earth-rock dam plays an important role in water conservancy project, but there were many damage cases caused by earthquakes, so it is necessary to investigate dynamic responses of earth-rock dams under combined action of earthquake and wave. Considering material nonlinearity, seepage, wave action, fluid-solid interaction, liquid sloshing, a numerical calculation model is established, and Arbitrary Lagrange Eulerian method is used to solve the nonlinear dynamic coupling problem. Dynamic responses under wave, earthquake and wave+earthquake are studied comparatively, and influences of near and far field earthquakes and PGA on dynamic responses are investigated. Results show that values and distributions of dynamic responses under wave and earthquake are quite different, and dynamic responses were further increased considering combination of earthquake and wave. Dynamic responses under far field long period earthquake is significantly larger than that under near field earthquake. With the increase of PGA, increase trends of horizontal displacement, vertical displacement and plastic strain are increased, while increase trend of maximum shear stress is slowed down. It can be obtained that when earthquake intensity is large, earth-rock dam will be easily damaged due to excessive deformation.
Highlights
In the construction of high dams, earth-rock fill dams have become an important choice of dam type
Zou et al [3] found that the impulsive ground motion had great influence on the horizontal displacement and stress of the earth-rock dam by finite element analysis
Cen et al [4] carried out seismic analysis of earth-rock dams on loess foundation and concluded that liquefaction of dam foundation would be caused under strong earthquake, which would endanger dam safety
Summary
In the construction of high dams, earth-rock fill dams have become an important choice of dam type. Yang et al [1] studied dynamic response of different types of high earth-rock dams under ground motion by shaking table test. Xian et al [16] found that influence of wave effect on seismic response of isolated bridges was small He and Li [17] obtained that combined effect of earthquake and wave on different platforms was different, in some cases, it was necessary to consider the combined effects of earthquake and wave. Earth-rock dams are widely used in engineering applications, most of the current researches only consider the seismic effect, but effects of waves on dynamic responses are different and cannot be ignored. Some research has shown that dynamic responses of the other structures under the combined action of wave and earthquake are complex, in most cases, it is necessary to consider the combined effects of earthquake and wave. Dynamic responses of dam under wave, earthquake and wave+earthquake are comparatively investigated; influences of seismic wave type and PGA on dynamic responses of earth-rock dam are discussed, which can provide references for improving the seismic safety of the earth-rock dam
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