噪声源瑞利面波波场的物理模拟研究

发布时间：2018-06-02 15:37

本文选题：瑞利面波频散 + 噪声源　；参考：《西南交通大学》2015年硕士论文

【摘要】：瑞利面波在波场中的能量占有比例较大,且面波速度与横波接近,在层状介质中具有速度频散特性,可用来推断地层信息,因此瑞利面波勘探法被广泛应用于地下调查领域,目前,对主动源瑞利面波探测方法国内外学者已经进行了比较深入的研究。近年来,噪声源瑞利面波探测方法受到广泛关注,大量的野外工作者在实地探测中对其进行了运用。但是对噪声源瑞利面波的模拟研究进行较少,对噪声源瑞利面波波场进行物理模拟,探究噪声源瑞利面波波场的普遍规律是十分有意义的。本论文主要介绍了瑞利面波理论及面波频散特性,以超声物理模拟为基础,选用合理的试验材料及观测方法制成了均匀地层的试验模型,对噪声信号源进行物理模拟,采集数据,并通过运用频率波数法(F-K法)和空间自相关法(spac法)进行数据处理,提取频散曲线。通过对主动源和噪声源两种方法提取的频散曲线的对比分析,指出主动源面波勘探法更适用于浅层工程探测,噪声源方法由于探测深度较深更适用于深部地层信息的采集。通过对噪声源的两种数据处理方法——F-K法和spac法的对比分析,指出在提取噪声源面波信息时spac法能有效避免体波干扰,在台阵精度满足要求的情况下,spac方法更适用于噪声源瑞利面波波场特性的分析。
[Abstract]:Rayleigh wave has a large proportion of energy in the wave field, and the velocity of the surface wave is close to that of the shear wave. It has the characteristics of velocity dispersion in layered media and can be used to infer the formation information. Therefore, Rayleigh surface wave exploration method is widely used in the field of underground investigation. At present, the active source Rayleigh surface wave detection methods at home and abroad have been more in-depth research. In recent years, the Rayleigh surface wave detection method of noise source has received extensive attention, and a large number of field workers have applied it in the field detection. But there is little research on Rayleigh surface wave simulation of noise source. It is very meaningful to simulate Rayleigh surface wave field of noise source and explore the general law of Rayleigh surface wave field of noise source. This paper mainly introduces Rayleigh surface wave theory and surface wave dispersion characteristics. On the basis of ultrasonic physical simulation, using reasonable test materials and observation methods to make a uniform formation test model, the noise signal source is physically simulated. The frequency wave number method (F-K method) and spatial autocorrelation method (spac method) are used to process the data to extract the dispersion curve. By comparing and analyzing the dispersion curves extracted by two methods, active source and noise source, it is pointed out that the active source surface wave exploration method is more suitable for shallow layer engineering detection, and the noise source method is more suitable for the collection of deep formation information because of the deeper exploration depth. By comparing and analyzing two kinds of data processing methods of noise source, F-K method and spac method, it is pointed out that spac method can effectively avoid volume wave interference when extracting surface wave information from noise source. The method of spac is more suitable for analyzing the characteristics of Rayleigh surface wave field of noise source when the precision of array is satisfied.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P631.4

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