Abstract
The randomness of earthquake excitation has a significant impact on the seismic performance of high earth-rock dams. In this paper, the seismic performance of geosynthetic-reinforced soil structures (GRSS) of high concrete face rockfill dams (CFRDs) is evaluated from the stochastic perspective. Multiple groups of seismic ground motions are generated based on spectral expression-random function non-stationary model. Taking Gushui CFRD as an example, this study calculates the failure probability of each damage level of non-reinforce slopes and reinforce slopes based on generalized probability density evolution method (GPDEM) and reliability analysis is presented though multiple evaluation indicators. The result shows that GRSS can reduce the mild damage of CFRDs during earthquake and restrain the moderate and severe damage. The influence of vertical spacing and length of GRSS on the seismic performance is obtained, which provides a reference for the seismic design and risk analysis of CFRDs.
Highlights
The high earth-rock dams under construction or proposed in China are mainly distributed in the western regions, where earthquakes occur frequently
Zhu et al [9] analyzed the influence of various parameters of geosynthetic-reinforced soil structures (GRSS) on seismic performance, based on the Fast
The system of reliability analysis of earthquake-resistant measures has four main steps: (1) multiple groups of random ground motion processes are generated, based on the non-stationary ground motion model; (2) the finite element model and the input the generated groups of random ground motions are utilized for batch computing; (3) the probability density function (PDF) and the cumulative distribution function (CDF) are obtained for dam safety performance indices, combined with the generalized probability density evolution theory; and (4) based on these steps, a probability model is constructed to analyze the reliability of a dam before and after the application of earthquake-resistant measures, so seismic performance may be evaluated
Summary
The high earth-rock dams under construction or proposed in China are mainly distributed in the western regions, where earthquakes occur frequently. Yang [10] evaluated the seismic stability of reinforced earth-rock dams, based on the upper-bound theorem of limit analysis, and studied the influence of geogrid length on seismic performance. Study of volumetric models of dams of large channels made of reinforced soil, and evaluated the influence of reinforcement on the bearing capacity of earth-rock dams. Relatively few studies have targeted the earthquake-resistant measures of high earth-rock dams from the perspective of random dynamics. This paper adopted a seismic ground motion generation method and the generalized probability density evolution theory for random dynamic analysis of high concrete face rockfill dams (CFRDs), in considering the randomness of seismic ground motions. The seismic performance of the proposed measure was evaluated from the perspective of dynamic reliability. The changes in the length and vertical spacing of GRSS were analyzed to provide a reference for the actual engineering design
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