Performance of geogrid reinforced ballast under dynamic loading.

Details

• Creators:
  Parsons, Robert ; Jowkar, Milad ; Han, Jie
• Corporate Creators:
  Mid-America Transportation Center
• Corporate Contributors:
  United States. Department of Transportation. Research and Innovative Technology Administration ; United States. Department of Transportation. University Transportation Centers (UTC) Program
• Subject/TRT Terms:
  • Ballast (Railroads)
  • Geogrids
  • Deterioration by environmental action
  • Traffic loads
  • Dynamic loads
  • Testing
  • Ballast (Railroads)
  • Fouling
  • Geogrids
  • Materials--Dynamic testing
  More +
• Publication/ Report Number:
  25-1121-0001-363
• Resource Type:
  Tech Report
• Geographical Coverage:
  United States
• Edition:
  Final report.
• Corporate Publisher:
  Mid-America Transportation Center
• Abstract:
  Railroad ballast consists of open graded crushed stone used as a bed for railroad track to provide stability. Over time, ; ballast degrades and loses its strength. Fouling of ballast with fines has been a major issue of railway engineering. In this ; experimental study, a full-scale railroad section 5 ft in length was constructed with and without geogrid reinforcement. A ; full-scale trapezoidal cross-section of a railroad was built. The subgrade was covered with 2 ft of ballast 9 ft wide at the top ; and sloped down on both sides on a 2:1 slope. The track panel ties were embedded in the ballast to a depth of 7 in. The ; reinforced test section that had geogrid placed 7 in. below the tie performed better than the unreinforced test section in ; regards to settlement and fouling of ballast. Settlement of the reinforced test section between the ties and geogrid was ; reduced by 37 to 65 percent compared with the settlement of the same portion of the unreinforced test section. The ; percentage of rock dust and small diameter particles generated by ballast breakdown beneath the ties was less for the ; reinforced test section than for the unreinforced test section.
• Format:
  PDF
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/25394/dot_25394_DS1.pdf
• File Type:
  [PDF - 6.00 MB]
• Collection(s):
  University Transportation Centers ; US Transportation Collection
• Main Document Checksum:
  urn:sha-512:d2a21ca541d71675595bbfede5df1b8ca78ce148d9bf623446c3ccfca004808e681f94b0dd2dbb62362cd2c6bdeb6a8fea0ffdd3532c6b8b657ef163b91c35b6