近断层脉冲型地震动作用下面板堆石坝的动力响应

发布时间：2018-04-18 04:40

本文选题：近断层 + 脉冲型地震动　；参考：《水利学报》2017年01期

【摘要】：越来越多的高土石坝正在西部地区建设或规划中,其中许多位于发震断裂带附近,遭遇近场强震的概率随着大坝数量的增加而增加,近断层脉冲型地震动作用下大坝地震响应特性亟待研究。本文选取10组台湾集集地震实测加速度时程,结合200 m级的面板堆石坝开展动力有限元分析,研究脉冲和非脉冲地震动作用对面板堆石坝的加速度、水平位移以及面板顺坡向应力的影响。结果表明,与非脉冲型地震动相比,脉冲型地震动对大坝堆石体的水平位移和面板顺坡向应力的影响较大,影响程度随着PGV/PGA(地面峰值速度/地面峰值加速度)的增大而增大。因此,在高地震区修建高土石坝时应对脉冲型地震进行专门研究,综合评价大坝的地震安全性和极限抗震能力。
[Abstract]:More and more high earth and rock dams are under construction or planning in the western region, many of which are located near the seismogenic fault zone. The probability of near-field strong earthquakes increases with the increase of the number of dams.The seismic response characteristics of the dam under the action of near-fault impulse ground motion need to be studied urgently.In this paper, 10 groups of seismic acceleration time history of Jiji earthquake in Taiwan are selected, combined with dynamic finite element analysis of 200m concrete face rockfill dam, the acceleration of concrete face rockfill dam caused by pulse and non-pulse ground motion is studied.The effect of horizontal displacement and downslope stress on the face slab.The results show that the influence of pulsed ground motion on the horizontal displacement of the rockfill and the slope stress of the face slab is greater than that of the non-pulsed ground motion, and the influence degree increases with the increase of the PGV / PGA (peak ground velocity / peak acceleration).Therefore, when constructing high earth and rock dams in highland seismic areas, special study should be made on pulsed earthquakes to comprehensively evaluate the seismic safety and ultimate seismic capacity of dams.
【作者单位】：大连理工大学海岸和近海工程国家重点试验室;大连理工大学水利工程学院;
【基金】：国家自然科学基金项目(51379028,51279025,51508071) 新世纪优秀人才支持计划项目(NCET-12-0083)
【分类号】：TV641.4;TV312

【相似文献】