混凝土–堆石组合坝加速度响应大型振动台试验研究

doi:10.13722/j.cnki.jrme.2016.0120

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Abstract

Concrete-rockfill combination dam(CRCD)，a new type of dam，consists of an upstream concrete wall and downstream declivitous rockfill；its dynamic characteristics have not been studied thoroughly so far. Based on this，large shaking table simulation tests of CRCD on the bedrock foundation were carried out to study the impact of the type of water storage，seismic waves，frequencies and amplitudes on the acceleration response. Results show that CRCD model has an obvious amplification effect on the input of seismic waves，and the weak area of the antiseismic is on the top of concrete wall and rockfill which have the maximum peak acceleration. The concrete wall of CRCD is not connected with the dam foundation，which is different from conctrete gravity dam，so the contact surface between wall -rockfill and wall-foundation is the key part of antiseismic design. The rockfill at the dam crest possesses the same obvious "Whiplash Effect" as the conventional earth-rock dams，while the acceleration response of CRCD is less than that of the conventional ones because of the concrete wall’s restriction. Water storage，seismic waves，frequencies and amplitudes have different effects on the acceleration response of the concrete wall and rockfill of CRCD：water storage has a slightly effect on the concrete wall than on the rockfill to weaken acceleration response；the acceleration amplification effect caused by near-field Shifang wave is more apparent than that of cosco-field Taft wave；there is no big difference between the influence of seismic frequencies and amplitudes on the acceleration response of concrete wall and that of rockfill；the acceleration amplification factors gradually decrease with the increase of seismic wave amplitudes and the acceleration amplification factors of the wall top is slightly greater than that of rockfill. The results reveals the acceleration response characteristics preliminarily and provides reference for the aseismic design of CRCD.

Key words： hydraulic engineering concrete-rockfill combination dam large scale shaking table simulation test seismic acceleration response

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	Articles by authors
	WANG Jianxin1
	LIU Hanlong2
	YANG Gui3
	TANG Xinjun1
	LIU Yanchen3

Cite this article:

WANG Jianxin1,LIU Hanlong2,YANG Gui3, et al. Large scale shaking table tests on seismic acceleration response of concrete-rockfill combination dam[J]. , 2017, 36(S1): 3276-3286.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2016.0120 OR https://rockmech.whrsm.ac.cn/EN/Y2017/V36/IS1/3276

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