Analysis on the Factors Affecting the CBR Value of Silt Roadbed

Silt has engineering defects and its California bearing ratio (CBR) value is low when it is used as roadbed filling. In order to analyze the influence of different factors on the CBR value of the silt roadbed, the CBR value is measured by changing silt particle content, initial water content, adding different salt and salt content, and changing overload pressure. The influence characteristics of different factors were also analyzed. The specimens were fabricated by heavy compaction criterion and soaked in water for four days. The standard penetration test was used to measure CBR value. The test results show that the CBR value of silt filling becomes larger as the silt particle content is reduced. The initial moisture content has remarkable influence on the CBR value, and the CBR value reaches the maximum with the optimum water content. The different salts and salt content have different effects on the CBR value, and the CBR value reduces to a great extent as the salt content increases. The overload pressure also has great influence on the CBR value, which becomes larger as the overload pressure increases. The research shows that the useful methods to improve the bearing capacity of silt roadbed include adding sand, controlling the compacted moisture content, reducing the salt content and preloading.


  • English

Media Info

  • Media Type: Web
  • Pagination: pp 1814-1819
  • Monograph Title: International Conference on Transportation Engineering 2009

Subject/Index Terms

Filing Info

  • Accession Number: 01528009
  • Record Type: Publication
  • ISBN: 9780784410394
  • Files: TRIS, ASCE
  • Created Date: Nov 12 2013 1:39PM