ENGINEERING

Seismic performance evaluation of agricultural reservoir embankment based on overtopping prevention structures installation

Bo Ra Yun1, Jung Hyun Ryu2, Ji Sang Han1, Dal Won Lee1,*

1Department of Agricultural and Rural Engineering, Chungnam National University, Daejeon 34134, Korea
2Department of Civil and Environmental Engineering, Seoul National University, Seoul 08826, Korea

*Corresponding author: dwlee@cnu.ac.kr

Abstract

In this study, three types of structures–stepped gabion retaining walls, vertical gabion retaining walls, and parapets–were installed on the dam floor crest to prevent the overflow of deteriorative homogeneous reservoirs. The acceleration response, displacement behavior, and pore water pressure ratio behavior were compared and evaluated using shaking-table model tests. The experimental conditions were set to 0.154 g in consideration of the domestic standard and the seismic acceleration range according to the magnitude of the earthquake, and the input waveform was applied with Pohang, Gongen, and artificial earthquake waves. The acceleration response according to the design ground acceleration increased as the height of the embankment increased, and the observed value were larger in the range of 1.1 to 2.1 times the input acceleration for all structures. The horizontal and vertical displacements exhibited maximum values on the upstream slope, and the embankment was evaluated as stable and included within the allowable range for all waveforms. The settlement ratio considering the similarity law exhibited the least change in the case of the parapet structure. The amplification ratio was 1.1 to 1.5 times in all structures, with the largest observed in the dam crest. The maximum excess pore water pressure ratio was in the range of 0.010 – 0.021, and the liquefaction evaluation standard was within 1.0, which was considered very stable.

Keywords

acceleration response, amplification ratio, displacements, excess pore water pressure ratio, shaking table model tests

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