Evaluation of Causes of Excessive Settlements of Pavements Behind Bridge Abutments and Their Remedies; Phase II: Executive Summary

Details

• Creators:
  Laguros, J. G. ; Zaman, M. M. ; Mahmood, I U
• Corporate Creators:
  University of Oklahoma, Norman
• Corporate Contributors:
  Oklahoma. Department of Transportation. Research & Development Division ; United States. Department of Transportation. Federal Highway Administration
• Subject/TRT Terms:
  Age Bridge Abutments Bridge Approaches Data Analysis Data Collection Embankments Field Studies Foundation Soils Soil Stabilization
• Publication/ Report Number:
  FHWA/OK 89 (07), ORA 157-293
• Resource Type:
  Tech Report
• Geographical Coverage:
  United States
• Corporate Publisher:
  Oklahoma. Department of Transportation
• Abstract:
  To evaluate the causes of bridge approach settlement a survey of 758 bridge approaches in seventy-seven counties of Oklahoma was conducted. In this survey, data related to the following items were collected: (i) bridge, abutment, approach, and slope protection structure; (ii) embankment material. Information related to the construction and maintenance for these approaches was collected by interviewing Oklahoma Department of Transportation (ODOT) personnel and searching records maintained at ODOT. The analyses of data show that the settlement problem is extensive in Oklahoma, namely, 83% of the approaches surveyed experienced settlement. It was observed that on the basis of long term performance rigid and flexible approaches are similar, but on a short term basis, rigid approaches experience lower differential settlement. Pile supported abutments as compared to stub type and high embankments with no drainage for the fills appear to be conductive to larger settlements. In general, skewed approaches have a higher settlement than non-skewed approaches. Regression techniques were used to develop an empirical relationship between the approach settlement and the causative parameters such as age of the approach, embankment height, traffic volume, and skewness of the approach. As a preliminary work for the next phase of the study, soil samples were collected from two sites. Comprehensive laboratory testing was conducted on these samples with the purpose of determining their site-specific embankment and foundation soil characteristics which may be used in a settlement prediction model.
• Format:
  PDF
• Funding:
  ODOT 86-04-2 It 2148
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:a28527a02624fa2d8c72dfe9a6bba773a183f6f779d0b55eeeeabb4a9f7525cea1e97f026fe6a7efcc9db8bbe489c3c501f3d08e9421eed864be6e1cc1999970
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/89298/dot_89298_DS1.pdf
• File Type:
  [PDF - 2.19 MB ]