A Study on the Dynamic Behavior of a Reinforced Reservoir Slope Using a 1g Shaking Table

Seokjin Oh; Hyeok Seo

doi:10.9720/kseg.2024.4.679

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2024 Vol.34, Issue 4 Preview Page Next Page

Research Article

A Study on the Dynamic Behavior of a Reinforced Reservoir Slope Using a 1g Shaking Table 1g 진동대를 이용한 저수지 보강사면의 동적 거동에 관한 연구

31 December 2024. pp. 679-690

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Abstract

Dams are artificial structures designed to create reservoirs that control river water flow. They store excess water during times of abundance and release it when natural flow is insufficient. However, aging reservoirs pose a significant risk; if they collapse due to seismic activity, there can be considerable loss of life and high restoration costs, making preventive measures crucial. This study investigates the impact of different seismic waves on aged reservoir embankments with riprap reinforcement. Using a 1g shaking table, a model embankment was constructed, and seismic simulations were conducted. The experimental results indicate that the reduction rate of peak ground acceleration (PGA) amplification compared to unreinforced conditions was, on average, 10% for partial reinforcement and 19% for full reinforcement on the upstream slope, 13% for partial and 20% for full reinforcement in the embankment core, and 9% for partial and 12% for full reinforcement on the downstream slope. The analysis of PGA reductions based on reinforcement cross-sections showed a reduction range of 7.6% to 17.6%, with an average reduction in amplification of over 13.0% due to the reinforcement effect.

Keywords

reservoir

1g shaking table

accelerometer

rockfill reinforcement

peak ground acceleration

댐은 하천의 물을 조절하기 위해서 인공적으로 저수지를 만드는 것이다. 여유가 있을 때 물을 저수지에 가두었다가 자연 유량이 부족할 때 저수지로부터 흘려보내는 기능을 가진다. 하지만 노후 저수지의 경우, 지진동에 의한 붕괴가 발생하였을 때, 인명피해를 가져오며, 많은 복구비용이 발생되므로 사전예방이 중요하다. 본 연구에서는 노후화된 저수지 제방의 사석보강 단면에 따라 다양한 지진파에 따른 제방에 미치는 영향을 확인하고자 1g 진동대 시험기에 모형제방을 조성하여 지진모형 실험을 수행하였다. 실험결과, 평균적으로 무보강 대비 최대지반가속도(peak ground acceleration, PGA) 증폭 감소율은 상류사면에서 부분보강시 10%, 전면보강시 19%, 중심부에서 부분보강시 13%, 전면보강시 20% , 하류 사면에서 부분보강시 9%, 전면보강시 12%로 확인되었다. 보강단면에 따른 PGA분석 결과, 감소율은 최소 7.6%에서 최대 17.6%로 확인되었으며, 보강효과에 따라 평균적으로 13.0% 이상 증폭율이 감소한 것을 확인할 수 있다.

키워드

저수지

1g 진동대

가속도계

사석보강

최대지반가속도

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Information

Publisher :Korean Society of Engineering Geology
Publisher(Ko) :대한지질공학회
Journal Title :The Journal of Engineering Geology
Journal Title(Ko) :지질공학
Volume : 34
No :4
Pages :679-690
Received Date : 2024-10-31
Revised Date : 2024-12-31
Accepted Date : 2024-12-31
DOI :https://doi.org/10.9720/kseg.2024.4.679

The Journal of Engineering Geology ISSN:1226-5268(Print) 2287-7169(Online) 지질공학

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