| 柳国环,陈欣宇,李鑫洋.半覆水相变V形峡谷场地P波入射下的空间地震动散射频域理论解、验证及特征[J].计算力学学报,2023,40(5):764~772 |
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| 半覆水相变V形峡谷场地P波入射下的空间地震动散射频域理论解、验证及特征 |
| Theoretical solutions of variable seismic motions for scattering of incident P-waves by a medium-transition V-shaped canyon with partly filled water and its verification and characteristics |
| 投稿时间：2022-04-13 修订日期：2022-08-21 |
| DOI：10.7511/jslx20220713001 |
| 中文关键词: 相变 V形峡谷 散射效应 多点地震动 理论解 |
| 英文关键词:medium-transition V-shaped canyon Scattering Multi-point seismic motions theoretical solution |
| 基金项目:国家自然科学基金(51978461)资助项目. |
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| 中文摘要: |
| 克服介质相变、峡谷分层且局部地形覆水导致的固有边界值难题,首次推导并得到了半覆水相变V形峡谷场地对P波激励下的散射理论解,验证理论解的正确性,探究了相变界面的有无、入射波频率和入射角对地表位移的显著影响,突出并重点强调了覆水因素对结果影响的不可忽视性。分析结果表明,(1)以经典算例为标准,对比验证了本文理论解的正确性,解释并澄清了峡谷局部可预测性的微小偏差的来源。(2)与未覆水部位相比,峡谷覆水部位表面位移显著增大;与峡谷满水状态相比,相变面的存在使位移增大的初始位置向峡谷中间移动;不同的入射波频率和入射角下,地面运动情况存在显著差异,随着入射角的增大,水平方向的位移逐渐增大,竖直方向的位移逐渐减小。本文研究可为覆水V形峡谷的长大结构多点地震动的合理输入提供基础性研究依据,兼有理论意义与应用价值。 |
| 英文摘要: |
| To overcoming the challenges of boundary problems caused by medium-transition,canyon stratification and local terrain filled with water,we have derived and obtained theoretical solutions of P-waves scattering in a medium-transition V-shaped canyon partly filled with water for the first time,and the correctness is further verified and clarified.To highlight the significance of this research,the effects of the presence or absence of the medium-transition interface,the frequency of the incidence-wave and incident angles on the ground displacement are investigated and analyzed in detail.Analysis results show that: (1) The correctness of the solution in this paper is verified by comparison with a classical example,and the intrinsic cause of the predictable minor deviation in the local part of the canyon is explained and clarified.(2) The ground displacement of the water-covered parts of the canyon increases significantly compared with that of no water-covered parts;besides,compared with the canyon of fully filled with water,the existence of the medium-transition interface leads to the initial position of the displacement amplitude amplification moving from both sides to the middle of the V-shaped canyon;For the different incident frequencies and angles,significant differences of seismic ground motion are shown obviously.With the increase of the incident angles,it can be observed that the displacement in the horizontal direction gradually increases,while it gradually decreases in the vertical direction.This study has both theoretical and application significance,and can provide a research basis for the reasonable multi-point seismic motions for those long-span structures located at V-shaped canyon with filled water. |
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