| 高铁波场等效震源时间函数反演方法研究 |
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| 引用本文： | 温景充,宁杰远.高铁波场等效震源时间函数反演方法研究[J].北京大学学报(自然科学版),2019,55(5):823-828. |
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| 作者姓名： | 温景充 宁杰远 |
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| 作者单位： | 1. 北京大学地球与空间科学学院, 北京 100871
2. 高铁地震学联合研究组, 北京 100029 |
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| 基金项目： | 国家自然科学基金(41874071)资助 |
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| 摘 要： | 基于桥墩均匀分布且高铁列车匀速行驶情况下, 每个桥墩源的震源时间函数仅存在时间延迟差异的假设, 分别通过构建均匀空间声波模型以及半无限空间弹性波模型, 计算格林函数, 给出反演所用的线性方程组。利用最小二乘法对高铁波场的等效震源时间函数进行反演, 测试在一定噪声水平下的反演效果, 探讨各种因素对反演结果的影响。
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| 关 键 词： | 高铁 震源时间函数 反演 格林函数 |
| 收稿时间： | 2019-07-29 |
Inversion of Effective Source Time Functionof the High-Speed-Rail Wavefield |
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| WEN Jingchong,NING Jieyuan.Inversion of Effective Source Time Functionof the High-Speed-Rail Wavefield[J].Acta Scientiarum Naturalium Universitatis Pekinensis,2019,55(5):823-828. |
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| Authors: | WEN Jingchong NING Jieyuan |
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| Institution: | 1. School of Earth and Space Sciences, Peking University, Beijing 100871
2. The Joint Research Group of High-Speed Rail Seismology, Beijing 100029 |
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| Abstract: | Based on the assumption that there is only time delay difference in the source time function of each pierwhen the piers are uniformly distributed and the high-speed train moves at a uniform speed, we calculate Green’sfunction by constructing uniform spatial acoustic wave model and semi-infinite spatial elastic wave model,respectively, and give the linear equations used for inversion. Then the least square method is used to invert theeffective source time function of the high-speed rail. For checking availability of the inversion method, the effectof inversion at a certain noise level is tested, and the influence of various factors on the inversion results isdiscussed. |
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| Keywords: | high-speed train source time function inversion Green’s function |
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