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首页> 外文期刊>American Journal of Traffic and Transportation Engineering >Study on Gradation Improvement of Gravel and Sand for Surface Layer of Railway Subgrade by Blending Method
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Study on Gradation Improvement of Gravel and Sand for Surface Layer of Railway Subgrade by Blending Method

机译：混合法改善铁路路基表层碎石砂级配的研究。

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摘要

As the direct foundation of the track, the surface layer of high-speed railway subgrade bed is one of the important parts of the subgrade. Its main function is to transmit and spread the vertical load of the upper ballast bed and the vehicle dynamic load to maintain the long-term stability of the subgrade bed surface. So, the material for the surface layer of subgrade bed should have high strength, elastic modulus, wear resistance and invented filtration. The graded sand gravel, which is used as the filler for the surface layer of railway subgrade bed, has such features as high mechanical strength, high water stability, easy obtaining, convenient construction, low cost and so forth. The purpose of this study is to physically blend local sand gravel materials to solve the defect of excessive fine particle content, so that it can meet the grading requirements of the specification and design standards and also to provide a general calculation method and solution for the mix ratio design of natural sand gravel. In combination with a foreign project, the dissertation expatiated on the calculation method for improving the gradation defects of natural sand gravel by the blending method. Then, according to local conditions, the author successfully solved the gradation defects of natural sand gravel mixture with the said method and achieved good economic and social benefits.
机译：作为轨道的直接基础，高速铁路路基的表层是路基的重要组成部分之一。它的主要功能是传递和分散上部压载床的垂直载荷和车辆动载荷，以保持路基床面的长期稳定性。因此，用于路基床表层的材料应具有高强度，弹性模量，耐磨性和发明的过滤性能。用作铁路路基表层填料的分级砂砾具有机械强度高，水稳定性高，易获得，施工方便，成本低等特点。这项研究的目的是对本地砂砾材料进行物理混合，以解决细颗粒含量过多的缺陷，从而使其能够满足规格和设计标准的等级要求，并为混合提供通用的计算方法和解决方案。天然砂砾石比例设计。结合国外工程，论文阐述了通过掺合法改善天然砂砾石级配缺陷的计算方法。然后，根据当地情况，用上述方法成功解决了天然砂砾混合料的级配缺陷，取得了良好的经济和社会效益。

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