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首页> 外文会议>ASME/IEEE/ASCE joint rail conference 2008 : Mechanical and civil engineering papers ; Electrical engineering papers >TWENTY-FIVE YEARS OF TRACK GEOTECHNOLOGY RESEARCH
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TWENTY-FIVE YEARS OF TRACK GEOTECHNOLOGY RESEARCH

机译：轨迹地球技术研究二十五年

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摘要

In the early 1980's the railroad industry increased funding to the AAR track research program to finds ways to mitigate the expected damage from the eventual introduction of heavy axle load (125-ton) freight cars. This research has provided valuable insights into the behavior of the geotechnical components of track (ballast, subballast, and subgrade) allowing certain long-held but erroneous assumptions about these components to be put to rest, such as the canard that fouling "muddy" material in the ballast resulted from subgrade material pumping upward. Analysis showed that typically the fouling material originated predominately from within the ballast layer itself due to ballast particle wear. With such improved understanding of substructure behavior the railroad industry was able to reduce costs by choosing more appropriate track maintenance and remediation methods. As understanding of track geotechnology has continued to advance, track substructure design and maintenance planning has become less empirical, less trial and error. The paper describes how, with today's more scientific approach, it is now possible to better address such track substructure problems as unstable "track transitions", soft subgrade, determining when ballast must be replaced, and more durable track geometry correction methods.
机译：在1980年代初期，铁路行业增加了对AAR轨道研究计划的资助，以寻找减轻最终引入重轴负载（125吨）货车的预期损害的方法。这项研究提供了关于轨道（道ast，路基ast和路基）的岩土成分行为的宝贵见解，可以搁置某些长期存在但错误的假设，例如对污染“泥泞”物质的鸭绒路基材料向上泵送造成的压载物。分析表明，由于压载物颗粒的磨损，结垢材料通常主要来自压载物层本身。通过对子结构行为的这种更好的理解，铁路行业能够通过选择更合适的轨道维护和修复方法来降低成本。随着对轨道地球技术的理解不断提高，轨道下部结构的设计和维护计划已变得越来越缺乏经验，更少的试验和错误。本文介绍了如何使用当今更加科学的方法，更好地解决轨道子结构问题，例如不稳定的“轨道过渡”，软路基，确定何时必须更换道ast以及更耐用的轨道几何校正方法。

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