路基病害探测技术及其应用研究
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摘要
随着我国铁路建设的飞速发展,路网规模不断得到扩大,路网骨架不断得到加强,路网结构不断得到优化,但与此同时,铁路部门运输任务日趋繁重,加之我国铁路修建年代不同、地质条件复杂及受当时设计施工等因素的影响,且目前我国铁路正朝着高速重载方向发展,许多线路路基存在着不同程度的病害隐患,严重影响列车的正常运营,甚至造成灾害性的事故。如何在不影响列车运营的情况下,高效快捷地查明这些隐患是人们非常关心的课题。因此,本文提出了瑞利波勘探法。瑞利波法是近年米新兴的、行之有效的原位测试方法,该法通过定量解释实测瑞利波频散曲线,反演地层速度结构,利用波速区分和确定地层物理力学特性,以解决岩土工程问题。瑞利波法在既有线路基病害探测中的成功应用,充分证明该法是完全可行的,有着良好的发展前景和推广价值。但是目前该法尚不完善,其理论和应用还在发展中。本文阐述了瑞利波法勘探的理论基础和勘探原理,分析了自由表面瑞利波的位移、能量及衰减等特征,讨论了瑞利波速度的工程意义;论文分析了均匀层状介质中瑞利波的频散特性,讨论了影响瑞利波法勘探精度的主要因素,并对其资料反演方法进行分析、比较,指出各自的优缺点;文中还简要分析了几种主要路基病害产生的机理,介绍了瑞利波法的野外工作方法及应注意的问题,并结合具体的科研课题,实例分析、研究了瑞利波法在路基病害探测中的应用,取得了较满意的效果。论文还针对不同的病害提出了相应的整治建议。
With the rapid development of railway construction in China, the network size has been continuously expanded, the net framework strengthened and the network structure optimized. At the same time, the task of railway transportation has been more and more onerous, then the railways are constructed in different ages, complex geological conditions and effected by their designs and constructions as well, in addition, the railways are making advances to speed-up and load-over now, so many railway roadbed have the existence of all kinds of diseases in different degree. These diseases effect badly the normal railway operation, even they may bring about catastrophic accidents. Thus it has been deeply concerned that how these diseases are high efficiently found out but the railway operation cannot be effected at all. So, Rayleigh wave prospecting is presented in this thesis. Rayleigh wave method is a jumped-up and effective in-situ test. We can inverts the velocity structure of the strata through the quantitive interpretation of dispersion curve of Rayleigh wave with this method, then distinguish and determine the physico-mechanical properties of the strata by the wave velocity in order to solve the geotechnical problems. The successful application of Rayleigh wave prospecting in the exploration of railway roadbed disease of the existing lines demonstrates fully that this method is completely feasible. Therefore it has broad prospect for application and is worth much promotion. But the method has not been perfect so far. It's theory and application have been in development. Firstly the theory and prospecting principle of Rayleigh wave method are demonstrated, the characteristic of displacement, energy and it's attenuation of Rayleigh wave in free surface are analyzed and the engineering importance of Rayleigh wave velocity is discussed. Then the frequency divergent characteristic of Rayleigh wave in homogeneous and horizontal bedding medium is analyzed and the major factors effecting on the exploration precision of Rayleigh wave method are discussed. This thesis analyses and compares all kind of inversion methods then pointes out their own excellences and disadvantages respectively. Besides this thesis deals with the mechanism of the main railway roadbed diseases and introduces the field work method as well as some items worthy of
    
    
    
    note. With practical examples in a research mission, the thesis also analyses and studies the application of Rayleigh wave method in the railway roadbed disease exploration and acquired satisfied results. In the end, this thesis puts forward repair advice aiming at different diseases accordingly.
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