Soil-Structure Interface Resistance Changes due to Rigid Awns
Publication: Geo-Congress 2024
ABSTRACT
This paper presents a study on the impact of rigid awns and their deployment on interface friction. Awns are appendages attached to the exterior surface of a geo-system and bio inspired by grass seeds. Awns provide frictional anisotropy and assist the seed in self-embedding into the soil or clinging to animal hair. In geo-systems, like piles, deployable awns can provide frictional anisotropy reducing installation effort and increasing global capacity. In addition, flexible awns can be folded up to enable space saving for transportation. This paper presents the results from a set of interface shear tests in a modified direct shear device. Single rigid awns were tested at various angles, from horizontal, as a pseudo-static simulation of deployment, in loose and dense sand, in both the cranial (towards the head) and caudal (towards the tail direction). It is shown that awns opened at larger angles provide higher interface friction and that shearing in the cranial direction provided more resistance than in the caudal direction. This demonstrates that deployable awns could be used in geo-systems to provide friction anisotropy and increase capacity.
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REFERENCES
Bernardi, I. J. 2022. Study of Frictional Anisotropy on Bio-Inspired Soil-Structure Interfaces for Pile and Anchor System Applications. Thesis. Dartmouth, MA: University of Massachusetts Dartmouth.
Cai, J., X. Deng, Y. Xu, and J. Feng. 2015. “Geometry and motion analysis of origami-based deployable shelter structures.” J. Struct. Eng., 141 (10): 06015001. American Society of Civil Engineers.
El Ghoraiby, M., H. Park, and M. T. Manzari. 2020. “Physical and mechanical properties of Ottawa F65 sand.” Model Tests Numer. Simul. Liq. Lateral Spreading LEAP-UCD-2017, 45–67. Springer.
Elbaum, R., L. Zaltzman, I. Burgert, and P. Fratzl. 2007. “The Role of Wheat Awns in the Seed Dispersal Unit.” Science, 316 (5826): 884–886. https://doi.org/10.1126/science.1140097.
Fleming, K., A. Weltman, M. Randolph, and K. Elson. 2008. Piling engineering. CRC press.
Frost, J. D., and J. T. DeJong. 2005. “In Situ Assessment of Role of Surface Roughness on Interface Response.” J. Geotech. Geoenvironmental Eng., 131 (4): 498–511. https://doi.org/10.1061/(ASCE)1090-0241(2005)131:4(498).
García-Mora, C. J., and J. Sánchez-Sánchez. 2021. “The convergence surface method for the design of deployable scissor structures.” Autom. Constr., 122: 103488. Elsevier.
Giampa, J. R., A. S. Bradshaw, and J. A. Schneider. 2017. “Influence of dilation angle on drained shallow circular anchor uplift capacity.” Int. J. Geomech., 17 (2): 04016056. American Society of Civil Engineers.
Howell, L. L., S. P. Magleby, and B. M. Olsen. 2013. Handbook of Compliant Mechanisms. John Wiley Sons Ltd Hoboken. Wiley Online Library.
Kota, S., J. Joo, Z. Li, S. M. Rodgers, and J. Sniegowski. 2001. “Design of compliant mechanisms: applications to MEMS.” Analog Integr. Circuits Signal Process., 29: 7–15. Springer.
Martinez, A., S. Palumbo, and B. D. Todd. 2019. “Bioinspiration for Anisotropic Load Transfer at Soil–Structure Interfaces.” J. Geotech. Geoenvironmental Eng., 145 (10): 04019074. https://doi.org/10.1061/(ASCE)GT.1943-5606.0002138.
Morrow, L. A., and P. W. Stahlman. 1984. “The History and Distribution of Downy Brome (Bromus tectorum) in North America.” Weed Sci., 32 (S1): 2–6. https://doi.org/10.1017/S0043174500060173.
O’Hara, K. B., and A. Martinez. 2020. “Monotonic and Cyclic Frictional Resistance Directionality in Snakeskin-Inspired Surfaces and Piles.” J. Geotech. Geoenvironmental Eng., 146 (11): 04020116. https://doi.org/10.1061/(ASCE)GT.1943-5606.0002368.
Pellegrino, S. 2001. Deployable structures in engineering. Springer.
Poppinga, S., A. Körner, R. Sachse, L. Born, A. Westermeier, L. Hesse, J. Knippers, M. Bischoff, G. T. Gresser, and T. Speck. 2016. “Compliant mechanisms in plants and architecture.” Biomim. Res. Archit. Build. Constr. Biol. Des. Integr. Struct., 169–193. Springer.
Sakr, M., A. Nazir, W. Azzam, and I. GamalEldin. 2023. “Group efficiency of tension double under-reamed piles in sand.” Indian Geotech. J., 53 (1): 11–28. Springer.
Schleicher, S. 2015. Bio-inspired compliant mechanisms for architectural design: transferring bending and folding principles of plant leaves to flexible kinetic structures.
Stutz, H. H., A. Martinez, L. Heepe, H. Tram Tramsen, and S. N. Gorb. 2019. “Strength anisotropy at soil-structure interfaces with snake skin inspired structural surfaces.” E3S Web Conf., (A. Tarantino and E. Ibraim, eds.), 92: 13008. https://doi.org/10.1051/e3sconf/20199213008.
Stutz, H., H. Tramsen, L. Heepe, and S. Gorb. 2021. “Strength and deformation behaviour of bio-inspired blade like surfaces sliding along a soil-structure interface.” ALERT Geomaterials, 62.
Sychterz, A., I. Bernardi, J. G. Tom, and R. D. Beemer. 2021. “Nonlinear soil-structure behavior of a deployable and compliant anchor system.” Can. J. Civ. Eng., cjce-2021-0204. https://doi.org/10.1139/cjce-2021-0204.
Tom, J., C. O’loughlin, D. White, A. Haghighi, and A. Maconochie. 2017. “The effect of radial fins on the uplift resistance of buried pipelines.” Géotechnique Lett., 7 (1): 60–67. Thomas Telford Ltd.
Wilde, B., H. Treu, and T. Fulton. 2001. “Field testing of suction embedded plate anchors.” Elev. Int. Offshore Polar Eng. Conf. OnePetro.
Zentner, L., and V. Böhm. 2009. “On the classification of compliant mechanisms.” Proc. EUCOMES 08 Second Eur. Conf. Mech. Sci., 431–438. Springer.
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Published online: Feb 22, 2024
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