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Unsaturated behavior of excavations in residual soil at the Auburn University National Geotechnical Experimentation Site

1 Richard Burrage, Inc., 675 Knollcrest Dr. NE., Concord, NC 28025, USA
2 Civil Engineering, Auburn University, 238 Harbert Engineering Center, Auburn University, AL 36849, USA

Special Issues: Characterization and Engineering Properties of Natural Soils used for geotesting

Two excavations were instrumented at the Auburn National Geotechnical Experimentation Site (NGES) in Opelika, AL. The excavations were constructed approximately 6 m deep × 30 m long with a vertical face. The primary goal of this experiment was to determine the boundary conditions that resulted in failure of the excavation. In doing so, conclusions were drawn regarding the accuracy of common laboratory test methods for estimating the strength properties of residual soil.
The instrumentation plan was designed to monitor real-time pore water pressures (positive and negative) surrounding the excavation throughout the course of each 1-year test period. Time-lapse cameras were used to identify when failures occurred, and the approximate geometry of the failure planes. Undisturbed soil samples were taken during the subsurface exploration and used in conjunction with previous soil test results to accurately define the material properties and layering based on common laboratory test methods. In addition to common laboratory tests, unsaturated triaxial tests were also conducted, and soil-water characteristic curves were measured to further define the unsaturated properties of the soil.
In both excavations, failure was observed along a similar plane, which began at the bottom of the excavation, and propagated to the surface (approximately 2 m behind the face of the excavation) along existing tension cracks that developed during the construction of the excavation. Based on these results, recommendations are provided as related to the most appropriate test methods for determining the strength properties of residual soil for use in geotechnical design.
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References

1. ASTM Standard D 5298-10 (2010) Standard Test Method for Measurement of Soil Potential (Suction) Using Filter Paper, Annual Book of ASTM Standards, ASTM International, West Conshohocken, PA.

2. Pictometry International Corp (2012) Springvilla, AL. Available from: http://www.bing.com/mapspreview?&cp=pdz5107wrpbz&lvl=20&style=b&v=2&sV=1&form=S00027.

3. Vinson JL, Brown DA (1997) Site Characterization of the Spring Villa Geotechnical Test Site and a Comparison of Strength and Stiffness Parameters for a Piedmont Residual Soil. Report No. IR-97-04, Highway Research Center, Harbert Engineering Center, Auburn University, AL.

4. ASTM Standard D 7181-11 (2011) Standard Test Method for Consolidated Drained Triaxial Compression Test for Soils, Annual Book of ASTM Standards, ASTM International, West Conshohocken, PA.

5. Burrage RE, Anderson JB, Pando MA, et al. (2011) A cost effective triaxial test method for unsaturated soils. Geotech Test J 35: 50-59.    

6. ASTM Standard D 5084-00 (2000) Standard Test Methods for Measurement of Hydraulic Conductivity of Saturated Porous Materials Using a Flexible Wall Permeameter, Annual Book of ASTM Standards, ASTM International, West Conshohocken, PA.

7. Lambe TW, Whitman RV (1969) Soil Mechanics. John Wiley and Sons, New York.

8. Zhang LL, Fredlund DG, Zhang LM, et al. (2004) Numerical study of soil conditions under which matric suction can be maintained. Can Geotech J 41: 569-582.    

© 2019 the Author(s), licensee AIMS Press. This is an open access article distributed under the terms of the Creative Commons Attribution Licese (http://creativecommons.org/licenses/by/4.0)

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