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:
  • Plasticity index
  • Soil nailing
  • Clay
  • Creep
• 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.
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• Format:
  PDF
• Funding:
  Project 0-6784
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/32370/dot_32370_DS1.pdf
• File Type:
  [PDF - 27.42 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:7b63417b63e965df5ee601afe8cebdd211aa2394363ee03b7068cacf93774a27