Back analysis of dynamic parameters of high earth-rock dam materials under weak earthquakes

WANG Mao-hua; CHI Shi-chun; XIANG Biao; ZHOU Xiong-xiong

doi:10.11779/CJGE202002010

Volume 42 Issue 2

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Chinese Journal of Geotechnical Engineering > 2020 > 42(2): 289-298. > DOI: 10.11779/CJGE202002010

WANG Mao-hua, CHI Shi-chun, XIANG Biao, ZHOU Xiong-xiong. Back analysis of dynamic parameters of high earth-rock dam materials under weak earthquakes[J]. Chinese Journal of Geotechnical Engineering, 2020, 42(2): 289-298. DOI: 10.11779/CJGE202002010

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Back analysis of dynamic parameters of high earth-rock dam materials under weak earthquakes

WANG Mao-hua^{1, 2,},
CHI Shi-chun^{1, 2, ,},
XIANG Biao³,
ZHOU Xiong-xiong^{1, 2}

1.
State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China
2.
Institute of Earthquake Engineering, School of Hydraulic Engineering, Faculty of Infrastructure Engineering, Dalian University of Technology, Dalian 116024, China
3.
College of Water Resources and Hydraulic, Yunnan Agricultural University, Kunming 650201, China

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Received Date: March 27, 2019
Available Online: December 07, 2022

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Abstract

Abstract

In the case of weak earthquakes, a back analysis model considering interaction and radiation damping effects is proposed for dynamic parameters of earth-rock dams. In the model, the viscous-elastic artificial boundary combined with transfer function is used for achieving the wave motion input of valley topography, and the multiple output support vector machine (MSVM) and particle swarm optimization (PSO) are adopted. Using PSO to optimize the dynamic parameters of the dam can effectively get the optimal combination of parameters. The trained MSVM used to describe the mapping relationship between the model parameters and the acceleration reduces computing time of parametric inversion, avoiding the problem that the traditional single support vector machines easily ignore the correlation between monitoring data. The inversion results of Nuzhadu dam show that the calculated settlements agree well with the measured data. The proposed model is feasible in back-analysis of dynamic parameters of earth-rock dams. The study shows that the dynamic shear modulus coefficient C of the dam materials obtained from the indoor dynamic triaxial tests is small and should be revised.
- weak earthquake,
- dynamic parameter,
- back analysis,
- viscous-elastic boundary,
- transfer function,
- MSVM,
- PSO

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References (36)

References

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