Consideration of regional variations in climatic and soil conditions in the modified triaxial design method.

Details

• Creators:
  Fernando, Emmanuel G. ; Oh, Jeongho ; Ryu, Duchwan ; Nazarian, Soheil
• Corporate Creators:
  Texas Transportation Institute
• Corporate Contributors:
  Texas. Dept. of Transportation. Research and Technology Implementation Office
• Subject/TRT Terms:
  Climate Pavements Pavements, Flexible--Texas--Design And Construction Soils And Climate--Texas Soils By Moisture Content Or Potential
• Publication/ Report Number:
  FHWA/TX-07/0-4519-2
• Resource Type:
  Tech Report
• Geographical Coverage:
  Texas
• Edition:
  Technical report; Sept. 2002-Dec. 2005.
• Corporate Publisher:
  Texas Transportation Institute
• Abstract:
  The Texas Department of Transportation (TxDOT) uses the modified triaxial design procedure to check
  
  pavement designs from the flexible pavement system program. Since its original development more than
  
  50 years ago, little modification has been made to the original triaxial design method. There is a need to
  
  verify the existing load-thickness design chart to assess its applicability for the range in pavement materials
  
  used by the districts and the range in service conditions encountered in practice. Additionally, there is a
  
  conservatism in the current method, which assumes the worst condition in characterizing the strength
  
  properties of the subgrade. While this approach may apply to certain areas of the state such as east Texas, it
  
  can lead to unduly conservative assessments of pavement load bearing capacity in districts where the climate
  
  is drier, or where the soils are not as moisture susceptible. Clearly, there is a need to consider regional
  
  differences to come up with a more realistic assessment of pavement thickness requirements for the given
  
  local conditions. To address this need, researchers characterized the variation of climatic and soil conditions
  
  across Texas to develop a procedure that accounts for moisture effects and differences in moisture
  
  susceptibilities among different soils. Researchers incorporated this procedure in a computer program for
  
  triaxial design analysis that offers greater versatility in modeling pavement systems compared to the limited
  
  range of approximate layered elastic solutions represented in the existing modified triaxial design curves.
  
  This program permits engineers to correct soil strength parameters to values considered representative of
  
  expected in-service conditions when such corrections are deemed appropriate for the given local climatic and
  
  soil conditions.
  
  
• Format:
  PDF
• Funding:
  0-4519
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:40b27484fc7ab398afd832d3da37ff092cb8d4c05b3c0c19d1439af0569ed108
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/16828/dot_16828_DS1.pdf
• File Type:
  [PDF - 2.57 MB ]