Creep behavior of soil nail walls in high plasticity index (PI) soils : technical report.

Details

• Creators:
  Sanchez, Marcelo ; Briaud, Jean-Louis ; Hurlebaus, Stefan ; Kharanaghi, Mohsen Mahdavi ; Bi, Gang
• Corporate Creators:
  Texas A&M Transportation Institute
• Corporate Contributors:
  Texas. Dept. of Transportation. Research and Technology Implementation Office ; United States. Federal Highway Administration
• Subject/TRT Terms:
  Clay Creep Plasticity Index Soil Nailing
• Publication/ Report Number:
  FHWA/TX-15/0-6784-1
• Resource Type:
  Tech Report
• Geographical Coverage:
  United States ; Texas
• OCLC Number:
  990283081
• Corporate Publisher:
  Texas A&M Transportation Institute
• Abstract:
  An aspect of particular concern in the Geotechnical Engineering Circular No. 7: Soil Nail Walls (i.e., the soil
  
  nail wall manual and construction guidelines) is the creep behavior of soil nail systems in high-plasticity
  
  clays. This research project was aimed at gaining a better understanding of the long-term behavior of the soil
  
  nail walls in fine-grained soil with plasticity index higher than 20. The project was composed of field,
  
  laboratory, and numerical modeling investigations. Pullout tests were performed at the National Geotechnical
  
  Experimental Site at Texas A&M University (NGES-TAMU) and at the actual soil nail wall project site
  
  selected by the Texas Department of Transportation (TxDOT). The TxDOT site was also instrumented and
  
  monitored for more than one year. The tests at the NGES-TAMU were focused on the effect of the load level
  
  on creep behavior of soil nails in a natural clay deposit of high plasticity. The tests were conducted on 10
  
  existing anchors (installed in 1991), 16 vertical soil nails installed in this research, and 6 sacrificial soil nails
  
  installed during the construction of a TxDOT soil nail wall. This wall corresponds to a new excavation
  
  project in an embankment fill, in which nine permanent soils nails were instrumented with the aim of
  
  monitoring the long-term behavior and performance of the wall in a high-plasticity clay. Complementary
  
  laboratory tests to learn about the creep behavior of the clays involved in this research project were
  
  performed at Texas A&M University using samples gathered from the two investigated sites. The numerical
  
  modeling had three goals: 1) to calibrate the constitutive models using the information gathered from the
  
  laboratory and the pullout tests; 2) to simulate the long-term behavior of the actual soil nail wall and to
  
  compare the model and monitoring results; and 3) to perform a parametric analysis to study the effect of
  
  different factors (among others, wall geometry and soil parameters). Based on the information obtained from
  
  the project activities, a tentative procedure was proposed to take into account the creep effects in the design
  
  of soil nail wall in high-plasticity soils.
  
  
• Format:
  PDF
• Funding:
  Project 0-6784
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:7b63417b63e965df5ee601afe8cebdd211aa2394363ee03b7068cacf93774a27
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/32370/dot_32370_DS1.pdf
• File Type:
  [PDF - 27.42 MB ]