| 半无限介质内异质体方位探测数值研究 |
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| 引用本文： | 柴华友,卢应发,李祺,刘明贵.半无限介质内异质体方位探测数值研究[J].岩土力学,2007,28(1):188-192. |
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| 作者姓名： | 柴华友 卢应发 李祺 刘明贵 |
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| 作者单位： | 1.中国科学院 武汉岩土力学研究所，武汉 430071；2.华中科技大学 土木工程与力学学院，武汉 430074 |
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| 摘 要： | 用数值模拟方法研究了地下异质体对波散射,分析了散射波对表面波相速度影响，结果表明：由相速度曲线扰动难以有效确定异质体方位。在表面波场中，散射波能量相对较小，不易辨别，以振源为中心，在测线上对称布置一组测点，通过两侧测点质点响应曲线比较，得到表面散射波场。在表面散射波场中，散射瑞利波是主要的，由散射瑞利波走时随测点位置变化可判断地下异质体的方位。最后，给出地下异质体方位测试方案。
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| 关 键 词： | 表面波 散射波 地下异质体 相速度 频散曲线 |
| 文章编号： | 1000-7598-（2007）01-0188-05 |
| 收稿时间： | 2005-12-12 |
| 修稿时间： | 2005-12-12 |
Numerical study on detection of heterogeneities in half space |
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| CHAI Hua-you,LU Ying-fa,LI Qi,LIU Ming-gui.Numerical study on detection of heterogeneities in half space[J].Rock and Soil Mechanics,2007,28(1):188-192. |
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| Authors: | CHAI Hua-you LU Ying-fa LI Qi LIU Ming-gui |
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| Institution: | 1. Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China; 2. College of Civil Engineering and Mechanics, Huazhong University of Science and Technology, Wuhan 430074, China |
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| Abstract: | The waves scattered by underground heterogeneities are studied by numerical simulation; and effects of the scattered waves on the surface wave velocity are analyzed. The results indicate that the location of a heterogeneity can not be effectively detected from variation of the phase velocity with the receiver position. Because energy of the scattered waves is small in the surface wave field, the scattered waves are not easily distinguished. When the source is taken as the center, and a group of receivers are symmetrically set along a measuring line, the scattered wave field can be obtained by comparing particle responses on two sides. The scattered Rayleigh waves dominate the scattered wave field, the locations of underground heterogeneities can be predicted by variation of traveling time of the scattered Rayleigh waves with the distance between the receiver and the source. Finally, the detection schemes are proposed. |
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| Keywords: | surface wave scattered wave underground heterogeneity phase velocity dispersion curve |
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