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Creep behavior of soil nail walls in high plasticity index (PI) soils : technical report.
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2017-04-01
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[PDF-27.42 MB]
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OCLC Number:990283081
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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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