埋入源下半无限体中瑞利波可激性研究

发布时间：2018-01-26 12:12

本文关键词： 埋入源瑞利波模态形状空间特性可激性　出处：《岩土力学》2017年09期 　论文类型：期刊论文

【摘要】：埋入源激发波场分析对岩土工程勘探非常重要。基于模态叠加法给出均匀半无限体中埋入球形膨胀点源激发波场位移表达式,由此研究瑞利波可激性及其传播特性,分析埋入源下瑞利波可激性机制,并通过有限元模拟验证分析方法有效性。结果显示:在均匀半无限体中瑞利波可激性受源埋深与波长比影响,比值越小,瑞利波可激程度越高;当比值大于1时,瑞利波不易激发。与自由状态下以平面波阵面传播的简正瑞利波相比,半无限体中埋入源激发瑞利波速度随传播距离变化,传播具有空间特性,距中心轴线越近,竖直向质点振动相速度越小,当距离大于一个波长时,激发瑞利波传播特性趋于简正瑞利波。
[Abstract]:The wave field analysis of buried source is very important for geotechnical engineering exploration. Based on modal superposition method, the displacement expression of wave field excited by buried spherical expansion point source in homogeneous semi-infinite body is given. In this paper, the excitability and propagation characteristics of Rayleigh wave are studied, and the mechanism of the excitability of Rayleigh wave under embedded source is analyzed. The validity of the method is verified by finite element simulation. The results show that the excitability of Rayleigh wave is affected by the ratio of source depth to wavelength in a homogeneous semi-infinite body. The smaller the ratio is, the higher the excitable degree of Rayleigh wave is. When the ratio is greater than 1:00, the Rayleigh wave is not easy to excite. Compared with the normal Rayleigh wave propagating on the plane wave front in the free state, the velocity of the Rayleigh wave excited by the buried source in a semi-infinite body varies with the propagation distance. The propagation has the spatial characteristic, the closer to the center axis, the smaller the velocity of vertical particle vibration phase is. When the distance is larger than one wavelength, the propagating characteristic of excited Rayleigh wave tends to be normal Rayleigh wave.
【作者单位】：武汉工程大学资源与土木工程学院;成都理工大学地质灾害防治与地质环境保护国家重点实验室;华中科技大学土木工程与力学学院;
【基金】：国家自然科学基金面上项目(No.41474113) 武汉工程大学人才专项经费资助项目地质灾害防治与地质环境保护国家重点实验室(成都理工大学)开放基金资助项目(No.SKLGP2013K003)~~
【分类号】：TU195
【正文快照】： This work was supported by the National Natural Science Foundation of China(41474113),the Talent Project of Wuhan Institute of Technology and theOpening Fund of State Key Laboratory of Geohazard Prevention and Geoenvironment Protection(Chengdu University

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