|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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Study on dynamic anti-sliding stability of a high gravity dam considering complex dam foundation
Deng-hong CHEN, Cheng-bin DU
Deng-hong CHEN, Cheng-bin DU
Department of Engineering Mechanics, College of Mechanics and Materials, Hohai University, Nanjing 210098, P. R. China
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|
This work was supported by the National Basic Research Program of
|Corresponding Authors: Deng-hong Chen|
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