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| 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 |
| Received:April 13, 2022 Revised:August 21, 2022 |
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| DOI：10.7511/jslx20220713001 |
| KeyWord:medium-transition V-shaped canyon Scattering Multi-point seismic motions theoretical solution |
| Author | Institution |
| 柳国环 |
天津大学 水利工程仿真与安全国家重点实验室, 天津 ;天津大学 建筑工程学院, 天津 |
| 陈欣宇 |
天津大学 水利工程仿真与安全国家重点实验室, 天津 ;天津大学 建筑工程学院, 天津 |
| 李鑫洋 |
天津大学 水利工程仿真与安全国家重点实验室, 天津 ;天津大学 建筑工程学院, 天津 |
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| Abstract: |
| 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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