Seismic Dynamic Response Characteristics of Dagangshan High Arch Dam: Case Study on Luding Ms 6.8 Earthquake

GAO Zhi-liang; TIAN Ling-yun; PANG Lei; CHU Chuan-qi

doi:10.11988/ckyyb.20230022

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Journal of Changjiang River Scientific Research Institute ›› 2024, Vol. 41 ›› Issue (6) : 143-149. DOI: 10.11988/ckyyb.20230022

Engineering Safety and Disaster Prevention

Seismic Dynamic Response Characteristics of Dagangshan High Arch Dam: Case Study on Luding Ms 6.8 Earthquake

GAO Zhi-liang, TIAN Ling-yun, PANG Lei , CHU Chuan-qi

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Abstract

The aim of this research is to explore the impact of the 6.8 magnitude earthquake in Luding County,Ganzi Prefecture of Sichuan Province on Dagangshan High Arch Dam on September 5,2022. According to the monitoring data of 21 earthquake sensors installed across the dam body and its foundation,we analyzed the time and frequency domains of the seismic recordings from the Luding earthquake to unravel the dynamic response patterns of Dagangshan High Arch Dam during the earthquake. Findings reveal substantial displacements and accelerations along the dam crest and the abutments on both sides. Notably,the highest recorded acceleration peak,reaching 576.6 cm/s²,was found at the No.6 dam section atop the crest. The seismic impact on Dagangshan High Arch Dam manifests prominently within the frequency spectrum of 0.5 to 8 Hz. Moreover,the dam’s towering stature accentuates ground motion response,particularly amplifying peak accelerations along the riverbanks. Post-earthquake assessment indicates the dam’s operational stability with minimal impact on its overall integrity. However,vigilance is warranted for the dam abutments and adjacent slopes,necessitating meticulous observation and maintenance measures.

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Luding earthquake / time domain characteristics / frequency domain feature / magnification effect / Dagangshan high-arch dam

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GAO Zhi-liang, TIAN Ling-yun, PANG Lei , CHU Chuan-qi. Seismic Dynamic Response Characteristics of Dagangshan High Arch Dam: Case Study on Luding Ms 6.8 Earthquake[J]. Journal of Changjiang River Scientific Research Institute. 2024, 41(6): 143-149 https://doi.org/10.11988/ckyyb.20230022

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