Water Science and Engineering 2011, 4(2) 212-224 DOI:   10.3882/j.issn.1674-2370.2011.02.009  ISSN: 1674-2370 CN: 32-1785/TV

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Keywords
complex dam foundation
dynamic strength reduction method
instability criterion
elasto-plastic model
dynamic time history analysis
Authors
CHENG-BIN -Du
PubMed
Article by
Article by Cheng-bin,.D

Study on dynamic anti-sliding stability of a high gravity dam considering complex dam foundation

Deng-hong CHEN, Cheng-bin DU

 

Department of Engineering Mechanics, College of Mechanics and Materials, Hohai University,        Nanjing 210098, P. R. China

Abstract

There existed some limitations when analyzing the anti-sliding seismic stability of dam-foundation system by traditional pseudo-static method and response spectrum method. The dynamic strength reduction method was used to study on the deep anti-sliding stability of a high gravity dam considering complex dam foundation under strong earthquake-induced ground action. The static analysis was firstly carried out by reducing the shear strength parameters of the dam foundation’s rock mass with equal proportion. Then, the time-history seismic analysis was carried out based on the static analysis. It was proposed as one of dynamic instability criterions that the peak values of the dynamic displacements and plastic strain energy change suddenly with increasing strength reduction coefficient. The elasto-plastic behavior of the dam foundation was idealized using Drucker–Prager yield criterion based on associated flow rule assumption. Through the static, dynamic strength reduction analysis and dynamic linear elastic analysis of the overflow dam monolith of a high gravity dam, the results’ reliability of elastic-plastic time history analysis was confirmed. The results also showed that the rock mass strength of the high gravity dam foundation has higher strength reserve coefficient. The instability criterions of dynamic strength reduction method proposed were feasible. Although the static anti-slide analysis methods and standards of gravity dam based on the numerical methods are being discussed at present, the dynamic calculation method and instability criterions proposed in this paper would provide some meaningful suggestions for the dynamic analysis of the similar projects.

Keywords complex dam foundation   dynamic strength reduction method   instability criterion   elasto-plastic model   dynamic time history analysis  
Received 2010-10-29 Revised 2011-01-05 Online: 2011-10-09 
DOI: 10.3882/j.issn.1674-2370.2011.02.009
Fund:

This work was supported by the National Basic Research Program of China (973 Program, Grant No. 2007CB714104)

Corresponding Authors: Deng-hong Chen
Email: chdenghong@163.com
About author:

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