张雪东,魏迎奇,聂鼎,张紫涛,梁建辉,胡晶.基于离心机振动台模型试验的面板堆石坝地震响应研究[J].水利学报,2019,50(5):589-597 |
基于离心机振动台模型试验的面板堆石坝地震响应研究 |
Examining the seismic behavior of concrete-faced rock-fill dams using dynamic centrifuge tests |
投稿时间:2018-07-18 |
DOI:10.13243/j.cnki.slxb.20180662 |
中文关键词: 离心机振动台试验 面板堆石坝 地震响应 面板应力 破坏模式 |
英文关键词: dynamic centrifuge test concrete-faced rock-fill dams seismic response stress in the face slab failure mode |
基金项目:国家重点研发计划项目(SQ2017YFSF060085);中国水科院基本科研业务费专项(GE0145B102017,GE0145B122019) |
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中文摘要: |
本文开展了竣工期、蓄水期面板堆石坝地震响应的一系列离心机振动台模型试验,重点探究了地震过程中面板应力的演进规律及破坏模式。试验结果表明,面板应力的演进规律与其地震动历史有关。当作用于坝体的地震动峰值或Arias强度高于其所经历的地震动时,无论在竣工期还是蓄水期,面板外表面压应力增量随时间逐渐增大,而内表面拉应力增量逐渐发展;当作用于坝体的地震动峰值与其经历的最大地震动相比较弱时,面板应力总体趋势的变化主要体现在内表面拉应力增量的发展,而其外表面压应力增量的发展较为微弱。另外,同一高程处的面板应力响应随地震动峰值或Arias强度而增大,与地震动峰值或Arias强度对堆石区变形的影响相一致。地震过程中坝坡破坏模式以浅层滑动为主。研究成果将为完善面板堆石坝的抗震设计、优化抗震加固措施提供一定的理论基础与技术支撑。 |
英文摘要: |
This study aims to examine the stress evolution in the face slab during shaking and its failure mode under earthquakes. To achieve this,a series of dynamic centrifuge tests were carried out. The experi-mental results indicate that compressional and tensional stress increments are developed in the outer and in-ner faces of the slabs, respectively. Meanwhile, the response of the stress in the face slab becomes stron-ger for a larger PGA or Arias Intensity, which is related to the effect of PGA or Arias Intensity on the rock-fill deformation. Moreover, there is minor compressional stress increment on the outer face if the dam has experienced a relatively large earthquake. Shallow surface sliding is shown to be the main failure mode under earthquakes. The experimental results can provide theoretical basis and technical support for the im-provement of the seismic design and seismic measure. |
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