Evaluation of geofabric in undercut on MSE wall stability.

Details

• Creators:
  Khan, Lutful ; Pearson, Cynthia
• Corporate Creators:
  Cleveland State University. Department of Civil and Environmental Engineering
• Corporate Contributors:
  United States. Federal Highway Administration
• Subject/TRT Terms:
  Geotextiles Geotextiles--Ohio Retaining Walls Retaining Walls--Ohio--Design And Construction Shear Strength Shear Strength Of Soils--Testing Shear Tests Soil Tests
• Publication/ Report Number:
  FHWA/OH-2011/2
• Resource Type:
  Tech Report
• Geographical Coverage:
  Ohio
• Corporate Publisher:
  Ohio. Dept. of Transportation. Office of Research and Development
• Abstract:
  Compaction of granular base materials at sites with fine grained native soils often causes unwanted
  
  material loss due to penetration at the base. In 2007, ODOT began placing geotextile fabrics in the
  
  undercut of MSE walls at the interface of the native soil and aggregate fill to facilitate construction. It is
  
  probable that the sliding resistances of the MSE retaining walls are affected by this practice. At this time,
  
  it is unknown if shear parameters at the base of the MSE walls are altered due to the presence of
  
  geotextiles at the soil/stone (granular backfill) interface and, if the factor of safety (FS) against sliding
  
  failure is compromised. To address this issue, a systematic investigation of the shear parameters at the
  
  geotextile/stone interface and native-soil/stone interface was conducted by Large Scale Direct Shear
  
  tests. It was observed that the shear strength between the geofabric/stone interfaces were lower than
  
  those of the soil/stone interfaces. The extent of the shear reduction depended on the properties of the
  
  base soil. For the same stone, the shear parameters at the geofabric interface changed from those of the
  
  cohesive soil interface such that friction angle slightly increased and the adhesion slightly decreased.
  
  However, the net shear strength at the geofabric interface, calculated with 25 psi normal stress, was
  
  generally lower. In case of cohesionless base soil, the shear parameters at the geofabric/stone interface
  
  reduced noticeably from those of soil/stone interface. This, in turn, produced a significant (up to 30%)
  
  reduction in shear strength at the geofabric/stone interface, calculated under 25 psi normal pressure. The
  
  findings of this research indicate that the design of MSE walls with geofabric at the undercut may require
  
  modification of the sliding safety factor to reflect the reduced shear strength at the interface.
  
  
• Format:
  PDF
• Funding:
  134396
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:78d6a472522b8045d53eda851d04ff00179126a58e17cefb0f816af78827849e
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/20693/dot_20693_DS1.pdf
• File Type:
  [PDF - 1.47 MB ]