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全波震相分析的应用 被引量:21
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作者 赵鸿儒 孙进忠 唐文榜 《地球物理学报》 SCIE EI CAS CSCD 北大核心 1990年第1期54-63,共10页
全波震相分析法是以弹性波传播理论为基础,以现代数字技术为手段,对地震波进行全面综合分析的理论和方法.它既包括对单一分量震波观测记录中的各种震相的识别、确认和分析,又包括对多分量震波记录的合成、分析和图示.全波震相分析法涉... 全波震相分析法是以弹性波传播理论为基础,以现代数字技术为手段,对地震波进行全面综合分析的理论和方法.它既包括对单一分量震波观测记录中的各种震相的识别、确认和分析,又包括对多分量震波记录的合成、分析和图示.全波震相分析法涉及震源、射线路径、初动、走时、振幅、波形、时域和空域的瞬态谱、质点振动矢量等诸多方面,因而能更全面地揭示地震波场与地下介质之间的关系.本文以实例展示在不同领域的研究中全波震相分析的应用情况.全波震相分析法为实现多种波型的联合应用奠定了理论基础,并提供了新的方法. 展开更多
关键词 全波 震相 超声模型 地球物理学 震源 走时分析 波谱 波形
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基于层析成像的服役刚构桥接缝混凝土无损检测方法
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作者 徐同舟 于锦添 +1 位作者 韩旭 魏思聪 《高速铁路新材料》 2024年第3期68-75,共8页
大跨度连续刚构桥接缝工作状态会显著影响桥梁的纵向刚度分布,从而改变结构受力。目前,接缝部位混凝土尚缺少针对性的无损检测手段。为探明实际结构中接缝混凝土缺陷状况,基于走时分析的图像重建原理,建立了离散慢度模型,并使用代数重... 大跨度连续刚构桥接缝工作状态会显著影响桥梁的纵向刚度分布,从而改变结构受力。目前,接缝部位混凝土尚缺少针对性的无损检测手段。为探明实际结构中接缝混凝土缺陷状况,基于走时分析的图像重建原理,建立了离散慢度模型,并使用代数重建算法(ART)求解,重建接缝内部缺陷图像,提出了针对接缝混凝土的超声无损检测方法。结合在役大跨度连续刚构桥上部结构拆除工程,针对实际工程场景设计了6层超声传感器布设方案,建立了6×8路径信息矩阵,通过ART算法求解,对接缝质量状况进行了无损检测,并与有损取芯结果进行了对比分析。实桥检测试验表明:提出的基于图像重建原理的大跨度连续刚构桥接缝质量超声检测方法具有较高准确性。结合桥梁上部结构拆除工程,在对桥梁接缝的49处有损取芯检测基础上,初步建立了基于声时值的接缝混凝土内部缺陷评价标准。 展开更多
关键词 桥梁工程 无损检测 层析成像 大跨度连续刚构桥 接缝质量 代数重建算法 走时分析
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Spatio-temporal Analysis of Urban Spatial Interaction in Globalizing China—A Case Study of Beijing-Shanghai Corridor 被引量:5
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作者 WU Wenjie ZHANG Wenzhong +1 位作者 JIN Fengjun DENG Yu 《Chinese Geographical Science》 SCIE CSCD 2009年第2期126-134,共9页
This paper aims to explore urban geography with a new perspective. Endowed with the urban geography connotations, an improved data field model is employed to integrate temporal dimension into spatial process of cities... This paper aims to explore urban geography with a new perspective. Endowed with the urban geography connotations, an improved data field model is employed to integrate temporal dimension into spatial process of cities in a typical region in this article. Taking the Beijing-Shanghai Corridor including 18 cities as an example, the authors chose the city centricity index (CCI) and the spatial data field model to analyze the evolution process and features of sub-region and urban spatial interaction in this corridor based on the data of 1991, 1996 and 2002. Through the analy- sis, we found that: 1) with the improvement of the urbanization level and the development of urban economy, the cit- ies’ CCI grew, the urban spatial radiative potential enhanced and the radiative range expanded gradually, which reflects the urban spatial interaction’s intensity has been increasing greatly; 2) although the spatial interaction intensity among the cities and sub-regions in the Beijing-Shanghai Corridor was growing constantly, the gap of the spatial interaction strength among different cities and sub-regions was widening, and the spatial division between the developed areas and the less developed areas was obvious; and 3) the intensity of the spatial interaction of Beijing, Shanghai and their urban agglomerations was far greater than that in small cities of other parts of the corridor, and it may have a strong drive force on the choice of spatial location of the economic activities. 展开更多
关键词 urban spatial interaction data field Beijing-Shanghai Corridor China
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Tunnel seismic tomography method for geological prediction and its application 被引量:52
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作者 Zhao Yonggui Jiang Hui Zhao Xiaopeng 《Applied Geophysics》 SCIE CSCD 2006年第2期69-74,共6页
Typical existing methods of tunnel geological prediction include negative apparent velocity, horizontal seismic profile, and the Tunnel Seismic Prediction (TSP) method as this technology is under development at home... Typical existing methods of tunnel geological prediction include negative apparent velocity, horizontal seismic profile, and the Tunnel Seismic Prediction (TSP) method as this technology is under development at home and abroad. Considering simpler observational methods and data processing, it is hard to accurately determine the seismic velocity of the wall rock in the front of the tunnel face. Therefore, applying these defective methods may result in inaccurate geological inferences which will not provide sufficient evidence for classifying the wall rock characteristics. This paper proposes the Tunnel Seismic Tomography (TST) method using a spatial observation arrangement and migration and travel time inversion image processing to solve the problem of analyzing the velocity structure of wall rock in the front of the tunnel face and realize accurate imaging of the geological framework of the tunnel wall rock. This method is very appropriate for geological prediction under complex geological conditions. 展开更多
关键词 tunnel geological prediction TST technology velocity analysis seismic migration travel time inversion and image.
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