【作者】 李志辉；

【导师】 刘争平；

【作者基本信息】 西南交通大学 ， 地质工程， 2005， 硕士

【摘要】 全面调查路基状态,在保证道路正常运营的同时,对这些病害存在部位探测定位,对重点路段的基床进行加固处理,以及整治效果的检测与评价成为当前影响国民经济发展的一项重要课题。地球物理射线追踪与层析成像技术的发展,为路基加固检测工程提供了一种快捷、安全、有效、经济和结果可视化程度较高的探测新技术。目前在世界范围内广为流行和使用的MATLAB语言是具有计算功能强大、计算结果和编程可视化及编程效率极高的大型软件与工作平台,十分适宜地球物理射线追踪与层析成像技术的教学及软件开发。应用射线追踪层析成像技术,通过MATLAB计算与数据处理,可重建路基下介质结构图像,进而对路基病害的类型、位置、程度及延展范围作出判释。依据判释结果针对性的展开改良加固,对比加固前后路基下介质结构图像,可以作为科学直观的整治效果评价依据。 本文从国内外基床病害整治措施现状着眼,首先,简要介绍了通常路基病害的探测技术,引入路基病害的层析成像(CT)探测技术,从数学物理模型和响应函数的正反演问题入手,展开数学物理理论分析,分别论述了射线追踪和层析成像基本原理和常用方法。其中,详细介绍了最短路径法射线追踪方法和层析成像离散图像反演重建技术:ART算法、SIRT算法以及其它反演方法等。 其次,本文引入被称作第四代计算机语言的MATLAB语言,通过实例介绍了MATLAB语言在地震勘探研究中的应用。发挥该语言特点,应用MATLAB直观、简洁的程序开发环境,通过构造建立数值模型、私有函数构造、程序分析及相关说明等环节,先后介绍了直射线正演算法(包括两种:发射点与接受点固定在网格节点上形式的正演实现、任意点激发与接收形式的正演实现)、弯曲射线最短路径正演算法的MATLAB实现过程、各种反演方法的MATLAB实现及数值模更多还原

【Abstract】 It is very important to investigate the roadbed, detect the orientation of diseases, reinforce the key section of highway and evaluate the result of reparation for the roadbed. With the development of ray tracing and tomography in physical geography, a new, fast, safe, effective and economical detection technology with high visible degree were provided for the application in roadbed reinforcement and evaluation. Matlab is the widely used computer language in the world and it has powerful calculated function, visible calculated result and programme, high efficiency of programme. It is very fit for the lessons and software research of ray tracing and tomography in physical geography. The image of construction under roadbed can be reconstructed and the type, orientation and the extension of ductibility of roadbed diseases can be explained by Matlab calculation and data process technology using the ray tracing and tomography in physical geography. According to the resul t of evaluation, the roadbed can be reinforced and the image can be as scientific evidence compared to unreinforced one.Based on the current step of repairing diseases of roadbed, this paper firstly introduced the general technology of roadbed diseases detection, showed the tomography of detection technology for roadbed diseases, analysed the forward and inverse model of maths, physics and response function , discussed the basic principle and methods of ray tracing andtomography in physical geography. The shortest path of ray tracing and the technology of inversion reconstruction in tomography were introduced in detail: ART arithmetic, SIRT arithmetic and other inversion methods.Secondly, Matlab were introduced in application of Matlab in the earthquake. Using simple and intuitional Matlab computer language, the model of numerical value and the private function were constructed, private function were constructed, programme were analysed, and other explanations, then following were introduced: both line and radial forward calculation , (the realization of forward calculation of shoot point and accept point in fixed gridding, the realization of forward calculation of random point of shoot and reception ), the realization of shortest pathway forward calculation by Matlab programme, the realization of several inversion calculation and some examples of numerical simulation. The error and stability (sensitivity) were analysed for inversion value using tomography and the evidence of interrelated parameter were showed for the convenience of Matlab language.Finally, according to the Matlab programme of ray tracing and tomography designed by author, the roadbed detection and in chemosynthesis grout detection reinforce in the application of technology based on the CT technology were introduced. In this paper, the process and measuring data analyse in roadbed grout, The process flow of Matlab wave tomography and some examples of tomography of earthquake transmission wave of a certain diseases in railroad bridge were introduced; Based on the principle of更多还原