高土石坝动力弹塑性与黏弹性分析方法比较研究

doi:10.13722/j.cnki.jrme.2018.1191

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Abstract In order to study the difference between the equivalent viscoelastic method and the elastoplastic method in earth-rock dam dynamic analysis，the Shen?s dynamic model and the generalized plasticity model were compared in several aspects of acceleration response，dam displacement history，residual deformation and slab dynamic stress under the same condition. Results show that，compared with the viscoelastic method，the acceleration amplifications at the top and at the lower middle of the dam calculated by the elastoplastic method are respectively slightly smaller and larger. Because the residual displacement is not considered in the viscoelastic method，the calculation displacement history is largely different from that obtained by the elastoplastic method. The residual deformation calculated by the viscoelastic method is rather consistent with the elastoplastic method，but the dam shrinkage evaluated by the elastoplastic method is more identical to actual earthquake damage. Calculation results by the viscoelastic method show that tensile failure will occur at the top part of the slab during the earthquake，but the results by the elastoplastic method reveal that compressive failure will occur at the middle of the slab. The main reason is that the viscoelastic method does not include the residual displacement component which results in the dynamic stress of the slab distorted. It is indicated that the elastoplastic method can effectively overcome the defects of the viscoelastic method.

Key words： soil mechanics earth rock dam earthquake analysis elastoplastic method viscoelastic method finite element method

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	Articles by authors
	WEI Kuangmin1
	2
	CHEN Shengshui1
	2
	LI Guoying1
	2
	MI Zhankuan1
	2

Cite this article:

WEI Kuangmin1,2,CHEN Shengshui1, et al. Study on dynamic elastoplastic and viscoelastic analysis methods for high earth-rock dams [J]. , 2019, 38(5): 1018-1029.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2018.1191 OR https://rockmech.whrsm.ac.cn/EN/Y2019/V38/I5/1018

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