Seismic Stability Analysis of Asphalt Concrete Face Rockfill Dam of Pumped Storage Power Station in Strong Earthquake Area
The upper reservoir of a planned pumped storage power station in the strong earthquake zone of northwest China adopts an asphalt concrete faced rockfill dam,with a maximum dam height of 161 m.Based on the nonlinear static analysis,the three-dimensional finite element seismic response and seismic stability calculation of dam are carried out by using equivalent viscoelastic model and dynamic time-history method.The results show that the dynamic response distri-bution of dam body and face slab is reasonable under the action of check earthquake with 1％ exceeding probability(PGA=0.48g)in 100 years.Among them,the extreme values of downstream,axial and vertical accelerations of the dam are 13.93 m/s2,13.91 m/s2 and 13.80 m/s2,respectively.Considering the static and dynamic superposition,the extreme value of tensile strain in the reverse arc section of asphalt concrete slab attains 0.95％,but it is less than the gen-eral allowable value of tensile strength of modified asphalt concrete.Therefore,even if the dam encounters the check earthquake(PGA=0.48g),it can maintain good overall safety and there will be no major seismic safety accidents.
check earthquakeasphalt concrete face rockfill damdynamic responseanti-sliding stabilitypumped storage power station
NETL
NSTL
万方数据
维普
