堤坝隐患的背景噪声研究

发布时间：2018-03-25 05:39

本文选题：微动探测　切入点：面波　出处：《华北水利水电大学》2017年硕士论文

【摘要】：随着国家对水利工程中病害问题的重视,病害的探测技术得到了长足的发展,地球物理勘探技术作为一种新的探测方法也得到了突破性的进展。近几年来,直流电法、电磁波法、弹性波法、放射法等物理方法先后在堤坝病害的探测中得到了应用。微动探测是一种无“源”勘探方法,它的信号源来自各种自然现象引起的地球表面的微弱振动,这些复杂的信号中包含有一些有用的信号,从中提取面波信息,并对面波频散曲线进行反演以得到地下介质的横波速度结构。微动阵列勘探具有方法简单、成本低、使用场地小、对周边环境比较友好等特点。微动作为一种新的勘察方法被应用在堤坝隐患探测领域,论文针对微动这种方法做了以下研究:(1)对微动的基本原理和传统阵列形式做了研究,在其基础上对其扩展形式做了研究。(2)通过黄河模型堤微动探测试验,对几种特有的隐患类型进行针对性探测,从而找到此方法的优缺点。(3)通过长江大堤的微动实测,验证此方法的有效性。通过以上研究发现,微动方法对孔洞、软弱层的探测效果比较好,对于裂缝探测效果并不好。微动方法大多都是用基阶面波进行反演,建议将基阶面波和高阶面波联合反演,效果会更好。
[Abstract]:With the national attention to the problem of diseases in water conservancy projects, the technology of disease detection has been greatly developed, and geophysical exploration technology, as a new detection method, has also made a breakthrough. In recent years, direct current method (DC) has been used. Electromagnetic wave method, elastic wave method, radiation method and other physical methods have been successively applied in the detection of dam diseases. Fretting detection is a kind of "source-free" exploration method, and its signal source comes from the weak vibration of the earth's surface caused by various natural phenomena. These complex signals contain some useful signals from which the surface wave information is extracted, and the dispersion curve of the surface wave is retrieved to obtain the velocity structure of the shear wave in the underground medium. The use of the site is small and friendly to the surrounding environment. Micromotion is a new survey method used in the field of detecting hidden dangers of dikes and dams. The basic principle and traditional array of fretting are studied in this paper. Based on this, the extended form of fretting is studied. 2) the fretting detection experiment of Yellow River model embankment is carried out. The effectiveness of this method is verified by the fretting measurement of the Yangtze River embankment, and it is found that the fretting method is effective to the holes through the above research. The detection effect of weak layer is better than that of crack detection. The fretting methods are mostly based on the fundamental surface wave inversion. It is suggested that the combined inversion of the basic order surface wave and the high order surface wave will be better.
【学位授予单位】：华北水利水电大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TV698.1;P631

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