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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摘要

混凝土–堆石组合坝(concrete-rockfill combination dam，简称CRCD)主要由上游混凝土墙与下游俯斜式堆石体构成，作为一种新型坝体结构，目前对其动力特性的研究鲜有报道。对此，开展基岩坝基混凝土–堆石组合坝大型振动台模拟试验，研究蓄水、地震波类型、频率、幅值等因素对加速度响应的影响。试验结果表明：CRCD模型对输入地震波具有明显的放大作用，混凝土墙顶部及堆石体顶部为峰值加速度最大区域，是抗震薄弱的部位。CRCD不同于混凝土重力坝，其混凝土墙与坝基非固结，因此墙体与堆石体及墙体与坝基之间的接触面是抗震设计的关键部位。堆石体坝顶具有一般土石坝的“鞭梢效应”，但因混凝土墙的约束限制作用使得堆石体加速度反应小于一般土石坝。蓄水、地震波类型、频率、幅值对CRCD的混凝土墙及堆石体的加速度影响不同：蓄水对混凝土墙的加速度响应削弱作用稍大于对堆石体的作用；近场什邡波比中远场Taft波引起的加速度放大效应更明显；地震波频率对混凝土墙与堆石体的加速度响应影响差异不大；加速度放大倍数基本上随着地震波幅值的增大逐渐降低，且混凝土墙顶加速度放大倍数稍大于堆石体顶部值。试验结果初步揭示了CRCD的加速度响应特征，为其在地震作用下的抗震设计等提供参考。

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	王建新1
	刘汉龙2
	杨贵3
	唐新军1
	刘彦辰3

关键词 ：水利工程；混凝土&ndash, 堆石组合坝；大型振动台；模拟试验；加速度响应

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

引用本文:

王建新1，刘汉龙2，杨贵3，唐新军1，刘彦辰3. 混凝土–堆石组合坝加速度响应大型振动台试验研究[J]. 岩石力学与工程学报, 2017, 36(S1): 3276-3286.
WANG Jianxin1，LIU Hanlong2，YANG Gui3，TANG Xinjun1，LIU Yanchen3. Large scale shaking table tests on seismic acceleration response of concrete-rockfill combination dam. , 2017, 36(S1): 3276-3286.

链接本文:

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

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