Research on Influence of Valley Width on the Acceleration Distribution of the Central Points of Concrete-Faced Rockfill Dam

Abstract:

3-D dynamical response analysis of concrete-faced rockfill dam is presented. Using equivalent-linear model, based on different dam heights and different shapes of river valley, the responses of dam subjected to different seismic intensity inputs have been studied. Especially the systematic analysis about the influence of the valley width on the distribution of the acceleration at the central points the bank slope is conducted. The results show that, the distribution of the horizontal acceleration along the dam heights at the central points on the central section of concrete-faced rockfill dam performs that the acceleration magnification which increases remarkably over 0.8H is a little smaller during 0~0.8H. For high concrete-faced rockfill dam, with the base acceleration excitations unchanged and the bank slope becoming steep (a gradient of 0.4), the valley width has a great impact on the magnification of the horizontal acceleration. The narrower the river valley is, the bigger the acceleration magnification is. With the slowing of the valley slope, the distribution of the acceleration magnification remains unchanged but the maximum reduces a little.

• Periodical: Applied Mechanics and Materials (Volumes 212-213)
• Pages: 853-858
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.212-213.853
• Online since: October 2012
• Authors: Hui Zhou, Ping Hu
• Keywords: 3-D Dynamical Response Analysis, Concrete-Faced Rockfill Dam, Equivalent-Linear Method, Maximum Acceleration, Seismic Amplification Factor

References

[1] CHEN Sheng-shui, HUO Jia-ping, ZHANG wei-min. Analysis of effects of "5.12" Wenchuan Earthquake on Zipingpu Concrete Face Rock-fill Dam. Chinese Journal of Geotechnical Engineering.2008, 30(6):795-801.(in Chinese)

[2] MEJIA L H, SEED H B. Comparison of 2D and 3D dynamic analyses of earth dams[J]. Journal of the Geotechnical Engineering, ASCE, 1983, 109(11): 1383−1398.

DOI: 10.1061/(asce)0733-9410(1983)109:11(1383)

[3] LIU Hou-xiang, LI Ning, LIAO Xue. Effective stress analysis method of seismic response for high tailings dam. Journal of Central South University of Technology, 2007, 14(1):129-134.

DOI: 10.1007/s11771-007-0026-z

[4] CHENG Y M, LANSIVAARA T, WEI W B. Two-dimensional slope stability analysis by limit equilibrium and strength reduction methods[J]. Computers and Geotechnics, 2007, 34(3): 137−150.

DOI: 10.1016/j.compgeo.2006.10.011

[5] SU Yong-hua, ZHAO Ming-hua, ZHANG Yue-ying. Numerical method of slope failure probability based on Bishop model [J]. Journal of Central South University of Technology, 2008, 15(1):100−105.

DOI: 10.1007/s11771-008-0020-0

[6] BROMHEAD E N. The Stability of Slopes[M]. New York: Surrey University Press, 1986.

[7] KIM J Y, LEE S R. An improved search strategy for the critical slip surface using finite element stress fields [J]. Computers and Geotechnics, 1997, 21(4): 295−313.

DOI: 10.1016/s0266-352x(97)00027-x

[8] Melo Cristiano, Sharma Sunil. Seismic coefficients for pseudostatic slope analysis[A]. 13th World Conference on Earthquake Engineering[C] . Vancouver , B. C. , Canada , August 1-6 , 2004 , No. 369.

[9] China Institute of Water Resources and Hydropower Research. Specifications for seismic design of hydraulic structures (SL203-97) [S]. Beijing: China WaterPower Press, 1998.

[10] KONG Xian-jing, LOU Shu-lian, ZOU De-gao, et al.(The equivalent dynamic shear modulus and equivalent damoing ratio of rockfill material for dam. Journal of Hydraulic Engineering.2001, 32(8):20-25.(in Chinese)