We performed a series of small-scale physical modeling tests on two types of multiple ball-shaped nodular underreamed anchors under vertical uplift loading conditions using transparent soil and particle image velocimetry. Three sets of numerical investigations were also carried out to study the effect of anchor structure parameters on uplift bearing capacity. The results show that a larger ball diameter efficiently enhances ultimate bearing capacity, and the distance between two neighboring balls is closely associated with the bearing capacity of the ball 'shoulder' and shear resistance along the enlargement sides. An optimal design parameter is recommended to achieve the anchor's maximum ultimate bearing capacity.
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References
C. Prakash and VVGST Ramakrishna, "Lateral load capacity of underreamed piles-an analytical approach," Soils Found., 44(5), 51-65 (2004).
A. G. Alekseev, S. G. Bezvolev, and P. M. Sazonov, "Experience of using multi-blade screw piles in silt-loam soil foundation," Soil Mech. Found. Eng., 55(6), 388-393 (2019).
H. Niroumand and K. A. Kassim, "Uplift response of irregular shape anchor in sand," Soil Mech. Found. Eng., 51(1), 23-28 (2014).
M. A. Shahin and M. B. Jaksa, "Pullout capacity of small ground anchors by direct cone penetration test methods and neural networks," Can. Geotech. J., 43(6), 626-637 (2006).
S. A. Rafa and B. Moussai, "Three- dimensional analyses of bored pile and barrette load tests subjected to vertical loadings," Soil Mech. Found. Eng., 55(3), 146-152 (2018).
H. P. Park, S. R. Lee, N. K. Kim, and T. H. Kim, "A numerical study of the pullout behavior of grout anchors underreamed by pulse discharge technology," Comput. Geotech., 47, 78-90 (2013).
M. G. Iskander, J. Liu, and S. Sadek, "Transparent amorphous silica to model clay," J. Geotech. Geoenviron. Eng., 128(3), 262-273 (2002).
J. Liu, M. G. Iskander, and S. Sadek, "Consolidation and permeability of transparent amorphous silica," Geotech. Test. J., 26(4), 390-401 (2003).
X. Yang, Y. Sun, and F. Yin, "Constitutive modeling for transparent granular soils," Int. J. Geomech., 17 (7), DOI:https://doi.org/10.1061/(asce)gm.1943-5622.000085704016150 (2017).
D. J. White, W. A. Take, and M. D. Bolton, "Soil deformation measurement using particle image velocimetry (PIV) and photo grammetry," Geotechnique, 53(7), 619-631 (2003).
Q. Ni, C. C. Hird, and I. Guymer, "Physical modelling of pile penetration in clay using transparent soil and particle image velocimetry," Geotechnique, 60(2), 121-132 (2010).
Y. Y. **a, C. Chen, and Q. Ni, "Comparative modelling of pull-out process of four different anchorages by using transparent soil," Geotech. Eng., 39(3), 399-407 (2017).
Y. Y. **a, C. Chen, and Q. Ni, "Research on continuous ball shape anchorages pulling-out mechanism by using transparent soil," Geotech. Eng., 39(5), 804-812 (2017).
Civil Engineering and Building Structures Standards Policy Committee, "British Standard Code of practice for grouted anchors," BS 8081. British Standards Institution, London (2015).
G. S. Littlejohn, "Design estimation of the ultimate load-holding capacity of ground anchors," Ground Eng., 13(8), 25-39 (1980).
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Translated from Osnovaniya, Fundamenty i Mekhanika Gruntov, No. 1, p. 18, January-February, 2020.
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Chen, C., **a, Y. & Ni, Q. Investigation on the Working Mechanism and Structural Parameters Optimization of Multiple Ball Shaped Nodular Anchors. Soil Mech Found Eng 57, 49–56 (2020). https://doi.org/10.1007/s11204-020-09636-5
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DOI: https://doi.org/10.1007/s11204-020-09636-5